HEP Phenomenology·hep-ph

Tue·Jul 30, 2019Tuesday·July 30, 2019

48 papers—33 primary·15 cross-listed·reconstructed*

01*
The QCD topological charge and its thermal dependence: the role of the $η^{'}$
Angel Gómez Nicola🇪🇸 · Jacobo Ruiz De Elvira🇨🇭 · Andrea Vioque-Rodríguez🇪🇸
We analyze the contribution of the $η^{'} (958)$ meson in the first two non-trivial moments of the QCD topological charge distribution, namely, the topological susceptibility and the fourth-order cumulant of the vacuum energy density. We perform our study within U(3) Chiral Perturbation Theory up to next-to-next-to-leading order in the combined chiral and large- $N_{c}$ expansion. We also describe the temperature dependence of these two quantities and compare them with previous analyses in the literature. In particular, we discuss the validity of the thermal scaling of the topological susceptibility with the quark condensate, which is intimately connected with a Ward Identity relating both quantities. We also consider isospin breaking corrections from the vacuum misalignment at leading order in the U(3) framework.
hep-phJHEP(2019)·32 citations
02*
An Oscillation Evident in Both Solar Neutrino Data and Radon Decay Data
P.A. Sturrock (1)🇺🇸 · E. Fischbach (2)🇺🇸 · O. Piatibratova (3)🇮🇱 · G. Steinitz (3)🇮🇱 · F. Scholkmann (4) ((1) Center for Space Science and Astrophysics and Kavli Institute for Particle Astrophysics and Cosmology, Stanford University (2) Department of Physics and Astronomy, Purdue University, (3) Geological Survey of Israel, (4) Research Office for Complex Physical and Biological Stems, Zurich, Switzerland)🇨🇭
Analyses of neutrino measurements acquired by the Super-Kamiokande Neutrino Observatory (SK, for the time interval 1996 - 2001) and of radon decay measurements acquired by the Geological Survey of Israel (GSI, for the time interval 2007 - 2017) yield remarkably consistent detections of the same oscillation: frequency 9.43 +/- 0.04 year-1 (SK), 9.44 +/- 0.04 year-1 (GSI); amplitude 6.8 +/- 1.7 % (SK), 7.0 +/- 1.0 % (GSI); phase 124 +/- 15 deg. (SK), 124 +/- 9 deg. (GSI). We briefly discuss possible hypotheses that may be relevant to this experimental result.
hep-phastro-ph.HE2 citations
03*
Towards enhanced databases for High Energy Physics
Andrea Ceccarelli🇮🇹 · Andrea Cioni🇮🇹 · Maria Vittoria Garzelli🇮🇹 · Piergiulio Lenzi🇮🇹 · Laura Redapi🇮🇹
The accumulation of a large amount of new experimental data at an impressive rate at present and future collider experiments has led to important questions concerning data storage and organization, their public access and usability, as well as their efficient usage in order to discriminate between different theories. For the last fourty years, the HEPData database has been the reference database for the worldwide community of elementary particle physicists, from DIS to fixed-target and collider experts. Using as a basis a dump of HEPData*, we discuss possible paths to enhance the capabilities of databases for High Energy Physics. Our starting point is the reorganization of the data in a different scheme, which allows for the application of OLAP techniques to automatically extract information at a multidimensional level, answering to complex queries. The feedback of the DIS community is important for understanding specific needs, aiming at a more effective storage, extraction and presentation of the data and information of their interest.
hep-phphysics.data-anPoS(2019)·0 citations
04*
Thermodynamic Geometry of the Quark-Meson Model
Bonan Zhang🇨🇳 · Shen-Song Wan🇨🇳 · Marco Ruggieri🇨🇳
We study the thermodynamic geometry of the Quark-Meson model, focusing on the curvature, $R$ , around the chiral crossover at finite temperature and baryon chemical potential. We find a peculiar behavior of $R$ in the crossover region, in which the sign changes and a local maximum develops; in particular, the height of the peak of $R$ in the crossover region becomes large in proximity of the critical endpoint and diverges at the critical endpoint. The appearance of a pronounced peak of $R$ close to the critical endpoint supports the idea that $R$ grows with the correlation volume around the phase transition. We also analyze the mixed fluctuations of energy and baryon number, $⟨ Δ U Δ N ⟩$ , which grow up substantially in proximity of the critical endpoint: in the language of thermodynamic geometry these fluctuations are responsible for the vanishing of the determinant of the metric, which results in thermodynamic instability and are thus related to the appearance of the second order phase transition at the critical endpoint.
hep-phhep-latnucl-thPRD(2020)·12 citations
05*
A global extraction of the jet transport coefficient in cold nuclear matter
Peng Ru🇨🇳 · Zhong-Bo Kang🇺🇸 · Enke Wang🇨🇳 · Hongxi Xing🇨🇳 · Ben-Wei Zhang🇨🇳
Within the framework of the generalized QCD factorization formalism, we perform the first global analysis of the jet transport coefficient ( $q^$ ) for cold nuclear matter. The analysis takes into account the world data on transverse momentum broadening in semi-inclusive electron-nucleus deep inelastic scattering, Drell-Yan dilepton and heavy quarkonium production in proton-nucleus collisions, as well as the nuclear modification of the structure functions in deep inelastic scattering, comprising a total of 215 data points from 8 data sets. For the first time, we clarify quantitatively the universality and probing scale dependence of the nuclear medium property as encoded in $q^$ . We expect that the determined parametrization of $q^$ in cold nuclear matter will have significant impact on precise identification of the transport property of hot dense medium created in heavy ion collisions.
hep-phhep-exnucl-exnucl-thPRD(2021)·46 citations
06*
Hazma: A Python Toolkit for Studying Indirect Detection of Sub-GeV Dark Matter
Adam Coogan🇳🇱 · Logan Morrison🇺🇸 · Stefano Profumo🇺🇸
With several proposed MeV gamma-ray telescopes on the horizon, it is of paramount importance to perform accurate calculations of gamma-ray spectra expected from sub-GeV dark matter annihilation and decay. We present hazma, a python package for reliably computing these spectra, determining the resulting constraints from existing gamma-ray data, and prospects for upcoming telescopes. For high-level analyses, hazma comes with several built-in dark matter models where the interactions between dark matter and hadrons have been determined in detail using chiral perturbation theory. Additionally, hazma provides tools for computing spectra from individual final states with arbitrary numbers of light leptons and mesons, and for analyzing custom dark matter models. hazma can also produce electron and positron spectra from dark matter annihilation, enabling precise derivation of constraints from the cosmic microwave background.
hep-phastro-ph.HEphysics.comp-phJCAP(2020)·93 citations
07*
Potential Dark Matter Signals at Neutrino Telescopes
Marco Chianese🇳🇱
Recent analyses of the diffuse TeV-PeV neutrino flux highlight a tension between different Ice-Cube data samples that strongly suggests a two-component scenario rather than a single steep power-law flux. Such a tension is further strengthened once the latest ANTARES data are also taken into account. Remarkably, both experiments show an excess in the same energy range (40-200 TeV), whose origin could intriguingly be related to dark matter. In this paper, I discuss the combined analysis of IceCube and ANTARES data, highlighting the presence of the low-energy excess. Moreover, I update the results of the angular analysis for potential dark matter signals, previously obtained with the 4-year High-Energy Starting Events data. In particular, I statistically compare the distribution of the arrival directions of 6-year IceCube events belonging to the low-energy excess with the angular distributions expected in case of different dark matter neutrino signals.
hep-phPoS(2020)·0 citations
08*
Phenomenological consistency of the singlet-triplet scotogenic model
Diego Restrepo🇨🇴 · Andrés Rivera🇨🇴
We perform a complete analysis of the consistency of the singlet-triplet scotogenic model, where both dark matter and neutrino masses can be explained. We determine the parameter space that yields the proper thermal relic density been in agreement with neutrino physics, lepton flavor violation, direct and indirect dark matter searches. In particular, we calculate the dark matter annihilation into two photons, finding that the corresponding cross-section is below the present bounds reported by the Fermi-LAT and H.E.S.S. collaborations. We also determine the spin-dependent cross-section for dark matter elastic scattering with nucleons at one-loop level, finding that the next generation of experiments as LZ and DARWIN could test a small region of the parameter space of the model.
hep-phJHEP(2020)·26 citations
09*
Dynamical vector resonances from the EChL in VBS at the LHC: the WW case
R. L. Delgado🇩🇪 · C. Garcia-Garcia🇪🇸 · M. J. Herrero🇪🇸
In this work we study the phenomenology of the process $pp \to W^{+} W^{-} j j$ at the LHC, in the scenario of the resonant vector boson scattering subprocess $W^{+} W^{-} \to W^{+} W^{-}$ which we describe within the effective field theory framework of the Electroweak Chiral Lagrangian. We assume a strongly interacting electroweak symmetry breaking sector in which dynamically generated resonances with masses in the TeV scale appear as poles in the Electroweak Chiral Lagrangian amplitudes unitarized with the Inverse Amplitude Method. The relevant resonance here, $V_{0}$ , is the neutral component of the triplet of vector resonances which are known to emerge dynamically at the TeV scale for specific values of the Electroweak Chiral Lagrangian parameters. With the aim of studying the production and possible observation of $V^{0}$ at the LHC, via the resonant $W^{+} W^{-} \to W^{+} W^{-}$ scattering, a MadGraph~5 UFO model has been developed employing a phenomenological Proca Lagrangian as a practical tool to mimic the correct $V^{0}$ properties that are predicted with the Inverse Amplitude Method. We choose to study the fully hadronic decay channel of the final gauge bosons $W W \to J (j j) J (j j)$ since it leads to larger event rates and because in the alternative leptonic decay channels the presence of neutrinos complicates the reconstruction of the resonance properties. In this context, the 2 boosted jets from the $W$ hadronic decays, $j j$ , are detected as a single fat jet, $J$ , due to their extreme collinearity. We perform a dedicated analysis of the sensitivity to these vector resonances $V^{0}$ with masses between 1.5 and 2.5 TeV at the LHC with $s = 13$ TeV and the planned high luminosity of 3000 $fb^{- 1}$ , paying special attention to the study of efficient cuts to extract the resonant vector boson fusion signal from the QCD background, which clearly represents the main challenge of this search.
hep-phJHEP(2019)·13 citations
10*
One-Loop Corrections to the Two-Body Decays of the Neutral Higgs Bosons in the Complex NMSSM
Julien Baglio🇩🇪 · Thi Nhung Dao🇻🇳 · Margarete Muhlleitner🇩🇪
Since no direct signs of new physics have been observed so far indirect searches in the Higgs sector have become increasingly important. With the discovered Higgs boson behaving very Standard Model (SM)-like, however, indirect new physics manifestations are in general expected to be small. On the theory side, this makes precision predictions for the Higgs parameters and observables indispensable. In this paper, we provide in the framework of the CP-violating Next-to-Minimal Supersymmetric extension of the SM (NMSSM) the complete next-to-leading order (SUSY-)electroweak corrections to the neutralHiggs boson decays that are on-shell and non-loop induced. Together with the also provided SUSY-QCD corrections to colored final states, they are implemented in the Fortran code NMSSMCALC which already includes the state-of-the art QCD corrections. The new code is called NMSSMCALCEW. This way we provide the NMSSM Higgs boson decays and branching ratios at presently highest possible precision and thereby contribute to the endeavor of searching for New Physics at present and future colliders.
hep-phEPJC(2020)·22 citations
11*
Solution to the Balitsky-Kovchegov equation with the collinearly improved kernel including impact-parameter dependence
D. Bendova🇨🇿 · J. Cepila🇨🇿 · J. G. Contreras🇨🇿 · M. Matas🇨🇿
The solution to the impact-parameter dependent Balitsky-Kovchegov equation with the collinearly improved kernel is studied in detail. The solution does not present the phenomenon of Coulomb tails at large impact parameters that have affected previous studies. The origin of this behaviour is explored numerically. It is found to be linked to the fact that this kernel suppresses large daughter dipoles. Solutions based on a physics motivated form of the initial condition are used to compute predictions for structure functions of the proton and the exclusive photo- and electroproduction of vector mesons. A reasonable agreement is found when comparing to HERA and LHC data.
hep-phPRD(2019)·53 citations
12*
Updating and Optimizing Error PDFs in the Hessian Approach. Part II
Tie-Jiun Hou🇨🇳 · Zhite Yu🇺🇸 · Sayipjamal Dulat🇨🇳 · Carl Schmidt🇺🇸 · C.-P. Yuan🇺🇸
In an earlier publication, we introduced the software package, {\tt \texttt{ePump}} (error PDF Updating Method Package), that can be used to update or optimize a set of parton distribution functions (PDFs), including the best-fit PDF set and Hessian eigenvector pairs of PDF sets (i.e., error PDFs), and to update any other set of observables, in the Hessian approach. Here, we validate the {\tt \texttt{ePump}} program with a detailed comparison against a full global analysis, and we demonstrate the potential of {\tt \texttt{ePump}} by presenting selected phenomenological applications relevant to the Large Hadron Collider. For example, we use the package to estimate the impact of the recent LHC data of the measurements of $W$ , $Z$ boson and top quark pair differential distributions on the CT14HERA2 PDFs.
hep-phhep-exhep-latPRD(2019)·43 citations
13*
Contributions from $Φ_{B 2}$ to the $B$ $\to$ $P P$ decays within the QCD factorization
Qin Chang🇨🇳 · Lili Chen🇨🇳 · Yunyun Zhang🇨🇳 · Junfeng Sun🇨🇳 · Yueling Yang🇨🇳
With the potential for the improvements of measurement precision,the refinement of theoretical calculation on hadronic $B$ weak decays is necessary. In this paper, we study the contributions of $B$ mesonic distribution amplitude $Φ_{B 2}$ within the QCD factorization approach, and find that $Φ_{B 2}$ contributes to only the nonfactorizable annihilation amplitudes for the $B$ $\to$ $P P$ decays ( $P$ denotes the ground $S U (3)$ pseudoscalar mesons). Although small, the $Φ_{B 2}$ contributions might be helpful for improving the performance of the QCD factorization approach, especially for the pure annihilation $B_{d}$ $\to$ $K^{+} K^{-}$ and $B_{s}$ $\to$ $π^{+} π^{-}$ decays.
hep-phEPJC(2019)·1 citation
14*
Radiative decays of $f_{1} (1285)$ as the $K^{*} K ˉ$ molecular state
Ju-Jun Xie🇨🇳 · Gang Li🇨🇳 · Xiao-Hai Liu🇨🇳
Within a picture of the $f_{1} (1285)$ being a dynamically generated resonance from the $K^{*} K ˉ$ interactions, we estimate the rates for the radiative transitions of the $f_{1} (1285)$ meson to the vector mesons $ρ^{0}$ , $ω$ and $ϕ$ . These radiative decays proceed via the kaon loop diagrams. The calculated results are in fair agreement with the experimental measurements. Some predictions can be tested by experiments and their implementation and comparison with these predictions will be valuable to decode the nature of the $f_{1} (1285)$ state.
hep-phhep-exCPC(2020)·16 citations
15*
Next-to-leading power corrections to $V + 1$ jet production in $N$ -jettiness subtraction
Radja Boughezal🇺🇸 · Andrea Isgrò🇺🇸 · Frank Petriello🇺🇸
We discuss the subleading power corrections to one-jet production processes in $N$ -jettiness subtraction using vector-boson plus jet production as an example. We analytically derive the next-to-leading power leading logarithmic corrections (NLP-LL) through $O (α_{S})$ in perturbative QCD, and outline the calculation of the next-to-leading logarithmic corrections (NLP-NLL). Our result is differential in the jet transverse momentum and rapidity, and in the vector boson momentum squared and rapidity. We present simple formulae that separate the NLP corrections into universal factors valid for any one-jet cross section and process-dependent matrix-element corrections. We discuss in detail features of the NLP corrections such as the process independence of the leading-logarithmic result that occurs due to the factorization of matrix elements in the subleading soft limit, the occurrence of poles in the non-hemisphere soft function at NLP and the cancellation of potential $T_{1} / Q$ corrections to the $N$ -jettiness factorization theorem. We validate our analytic result by comparing them to numerically-fitted coefficients, finding good agreement for both the inclusive and the differential cross sections.
hep-phPRD(2020)·57 citations
16*
Jarlskog determinant and data on flavor matrices
Jihn E. Kim🇰🇷 · Se-Jin Kim · Soonkeon Nam🇰🇷 · Myungbo Shim🇰🇷
The essences of the weak CP violation, the quark and lepton Jarlskog invariants, are determined toward future model buildings beyond the Standard Model (SM). The equivalence of two calculations of Jarlskog invariants gives a bound on the CP phase in some parametrization. Satisfying the unitarity condition, we obtain the CKM and MNS matrices from the experimental data, and present the results in matrix forms. The Jarlskog determinant $J^{q}$ in the quark sector is found to be $\sim 3.11 \times 1 0^{- 5} ∣ sin \delks ∣$ while $J^{ℓ}$ in the leptonic sector is $\sim 2.96 \times 1 0^{- 2} ∣ sin \delksl ∣$ in the normal hierarchy parametrization.
hep-phMod.Phys.Lett.A(2020)·4 citations
17*
Transverse momentum dependent of charged pion, kaon and proton/antiproton fragmentation functions from $e^{+} e^{-}$ annihilation process
Maryam Soleymaninia🇮🇷 · Hamzeh Khanpour🇮🇷
The main aim of this paper is a new determination of transverse momentum dependence of unpolarized fragmentation function (TMD FFs) in single inclusive hadron production in electron-positron annihilation (SIA) process. Motivated by the need for a reliable and consistent determination of TMD FFs, we use the most recent TMD production cross sections of charged pions ( $π^{\pm}$ ), kaons ( $K^{\pm}$ ) and protons/antiprotons ( $p / p ˉ$ ) measured in inclusive $e^{+} e^{-}$ collisions by Belle Collaboration. These datasets are the first transverse momentum dependence of identified light charged hadron measurements SIA process. In this analysis, referred to as {\tt SK19 TMD FFs}, the common Gaussian distribution is used for the $P_{h T}$ dependent of the cross section. The uncertainties in the extraction of {\tt SK19 TMD FFs} are estimated using the standard "Hessian" technique. We study the quality of the TMD FFs determined in this analysis by comparing with the available recent Belle cross sections measurement. For all hadron species, we found a very good agreement between this particular set of experimental data and the corresponding theory calculations over a relatively wide range of transverse momentum $P_{h T}$ . As a result of this study, suggestions are identified for possible future research considering the theory improvements and other available experimental observables.
hep-phhep-exPRD(2019)·13 citations
18*
Jet suppression from small to intermediate to large radius
Daniel Pablos🇳🇴
We present predictions for jet suppression from small to intermediate to very large radius, for low and very high energy jets created in heavy ion collisions at the LHC. We use the hybrid strong/weak coupling model for jet quenching that combines perturbative shower evolution with an effective strongly coupled description of the energy and momentum transfer from the jet into the hydrodynamic quark-gluon plasma. Because of momentum conservation, the wake created by the jet enhances or depletes the amount of particles generated at the freeze-out hypersurface depending on their orientation with respect to the jet. Within such framework we find that jet suppression is surprisingly independent of the anti- $k_{T}$ radius $R$ , first slightly increasing as one increases $R$ , then at larger values of $R$ very slowly decreasing. This nearly independence of jet suppression with increasing values of $R$ arises from two competing effects, namely the larger energy loss of the hard jet components, which tends to increase suppression, versus the partial recovery of the lost energy due to medium response, reducing suppression. We also find that the boosted medium from the recoiling jet reduces the amount of plasma in the direction opposite to it in the transverse plane, increasing the amount of jet suppression due to an over-subtraction effect. We show that this characteristic signature of the hydrodynamization of part of the jet energy can be quantified by selecting samples of dijet configurations with different relative pseudorapidities between the leading and the subleading jet.
hep-phnucl-thPRL(2020)·67 citations
19*
Chiral susceptibility in Nambu Jona Lasinio model: a Wigner function approach
Arpan Das🇮🇳 · Deepak Kumar🇮🇳 · Hiranmaya Mishra🇮🇳
We estimate here chiral susceptibility at finite temperature within the framework of the Nambu-Jona-Lasinio model (NJL) using the Wigner function approach. We also estimate it in the presence of chiral chemical potential ( $μ_{5}$ ) as well as a non vanishing magnetic field ( $B$ ). We use medium separation regularization scheme (MSS) to calculate the chiral condensate and corresponding susceptibility. It is observed that for a fixed value of chiral chemical potential ( $μ_{5}$ ), transition temperature increases with the magnetic field. While for the fixed value of the magnetic field, transition temperature decreases with chiral chemical potential. For a strong magnetic field, we observe non degeneracy in susceptibility for up and down type quarks.
hep-phnucl-thPRD(2019)·19 citations
20*
Lectures on Physics Beyond the Standard Model
Hyun Min Lee🇰🇷
We give a brief overview on the successes and theoretical problems of the Standard Model and discuss the basics of low-scale supersymmetry. We also address some of recent proposals for physics beyond the Standard Model and the connection to the production mechanisms for thermal dark matter.
hep-phJ.Korean Phys.Soc.(2021)·36 citations
21*
New physics from COHERENT data with improved Quenching Factor
Amir N. Khan🇩🇪 · Werner Rodejohann🇩🇪
A recent new measurement and re-analysis of past measurements suggested an improved quenching factor value and uncertainty for CsI[Na]. This implies a measurement of the COHERENT experiment of coherent elastic neutrino-nucleus scattering that is closer to the Standard Model prediction and has less uncertainty. We illustrate the impact of this improvement by revisiting fits to the Weinberg angle, neutrino magnetic moments, neutron rms and neutrino charge radii, neutrino non-standard interactions (in particular those relevant for LMA-Dark) and new scalar as well as vector bosons. Significant improvement is observed, particularly for those scenarios coherently affecting the electroweak SM process.
hep-phastro-ph.HEhep-exnucl-thPRD(2019)·75 citations
22*
Four-dimensional representation of scattering amplitudes and physical observables through the application of the Loop-Tree Duality theorem
Felix Driencourt-Mangin🇪🇸
In this thesis we propose a novel method to compute higher-order corrections to physical cross sections, bypassing more traditional approaches. This technique, the Four-Dimensional Unsubtraction (FDU), is based on the Loop-Tree Duality (LTD) theorem, and aims at building pure four-dimensional representations of scattering amplitudes at higher orders in perturbation theory. This is done by locally renormalising the virtual contribution at high energies, and then mapping the kinematics of the corresponding real contribution so it matches the virtual one in the soft and collinear limits. This makes the ultraviolet and infrared singularities vanish at the integrand level when taking the sum of both contributions, meaning that the four-dimensional limit can be taken before integrating, thus allowing for a straightforward numerical implementation. We apply this method for the first time to calculate the decay of a virtual photon to two massless quarks, and then generalise the method to massive particles. We also show new advantages provided by the LTD formalism. One of them is the possibility to write one- and two-loop scattering amplitudes in a universal form at the integrand level, regardless of the nature of the particle running inside the loop. The other is to perform integrand-level asymptotic expansions in the internal mass - without having to rely on expansion-by-region techniques - by taking advantage of the Euclidean nature of the integration domain. Finally, we present a new algorithm to locally renormalise two-loop amplitudes, where the renormalisation scheme can be easily fixed through subleading contributions in the ultraviolet region.
hep-phhep-thmath-phmath.MP16 citations
23*
B-meson production in the general-mass variable-flavour-number scheme and LHC data
M. Benzke🇩🇪 · B. A. Kniehl🇩🇪 · G. Kramer🇩🇪 · I. Schienbein🇫🇷 · H. Spiesberger🇩🇪
We study inclusive $B$ -meson production in $pp$ collisions at the LHC and compare experimental data with predictions of the general-mass variable-flavour-number scheme at next-to-leading order of perturbative QCD. We find almost perfect agreement provided that the factorization scale parameters and the parton distribution functions are chosen appropriately.
hep-phEPJC(2019)·19 citations
24*
The $Z_{3}$ symmetric I(2+1)HDM
A. Aranda🇲🇽 · D. Hernández-Otero🇲🇽 · J. Hernández-Sánchez🇲🇽 · V. Keus🇫🇮 · S. Moretti🇬🇧 · D. Rojas-Ciofalo🇬🇧 · T. Shindou🇯🇵
We introduce a 3-Higgs Doublet Model (3HDM) with two Inert (or dark) scalar doublets and an active Higgs one, hence termed I(2+1)HDM, in the presence of a discrete $Z_{3}$ symmetry acting upon the three doublet fields. We show that such a construct yields a Dark Matter (DM) sector with two mass-degenerate states of opposite CP parity, both of which contribute to DM dynamics, which we call \textit{Hermaphrodite DM}, distinguishable from a (single) complex DM candidate. We show that the relic density contributions of both states are equal, saturating the observed relic density compliant with (in)direct searches for DM as well as other experimental data impinging on both the dark and Higgs sectors of the model, chiefly, in the form of Electro-Weak Precision Observables (EWPOs), Standard Model (SM)-like Higgs boson measurements at the Large Hadron Collider (LHC) and void searches for additional (pseudo)scalar states at the CERN machine and previous colliders.
hep-phPRD(2021)·36 citations
25*
Loop-enhanced rate of neutrinoless double beta decay
Werner Rodejohann🇩🇪 · Xun-Jie Xu🇩🇪
Neutrino masses can be generated radiatively. In such scenarios their masses are calculated by evaluating a self-energy diagram with vanishing external momentum, i.e. taking only the leading order term in a momentum expansion. The difference between the full self-energy and the mass is experimentally difficult to access, since one needs off-shell neurinos to observe them. However, massive Majorana neutrinos that mediate neutrinoless double beta decay ( $0 ν β β$ ) are off-shell, with the virtuality of order 100 MeV. If the energy scale of the self-energy loop is of the order of this virtuality, the amplitude of double beta decay can be modified by the unsuppressed loop effect. This can have a drastic impact on the interpretation of future observations of the $0 ν β β$ decay.
hep-phhep-exJHEP(2019)·8 citations
26*
Asymptotic safety of gravity, the Higgs boson mass and beyond the Standard Model physics
Jan H. Kwapisz🇵🇱
There are many hints that gravity is asymptotically safe. The inclusion of gravitational corrections can result in the ultraviolet fundamental Standard Model and constrain the Higgs mass to take the smallest value such that electroweak vacuum is stable. Taking into account the current top quark mass measurements this value is $m_{H} \approx 130$ GeV.\\ This article considers the predictions of the Higgs mass in two minimal Beyond Standard Model scenarios, where the stability is improved. One is the sterile quark axion model, while the other is the $U (1)_{B - L}$ gauge symmetry model introducing a new massive $Z^{'}$ gauge boson. The inclusion of $Z^{'}$ boson gives the correct prediction for this mass, while inclusion of sterile quark(s) gives only a slight effect.\\ Also a new, gravitational solution to the strong CP problem is discussed.
hep-phgr-qchep-thPRD(2019)·40 citations
27*
Dark Matter Signals at the LHC from a 3HDM
Diana Rojas-Ciofalo🇬🇧 · Adriana Cordero🇲🇽 · Jaime Hernandez-Sanchez🇲🇽 · Venus Keus🇫🇮 · Stefano Moretti🇬🇧 · Dorota Sokolowska🇧🇷
We analyse new signals of Dark Matter (DM) at the Large Hadron Collider (LHC) in a 3-Higgs Doublet Model (3HDM) where only one doublet acquires a Vacuum Expectation Value (VEV), preserving a parity $Z_{2}$ . The other two doublets are inert and do not develop a VEV, leading to a dark scalar sector controlled by $Z_{2}$ , with the lightest CP-even dark scalar $H_{1}$ being the DM candidate. This leads to the loop induced decay of the next-to-lightest scalar, $H_{2} \to H_{1} f ˉ f$ ( $f = u, d, c, s, b, e, μ, τ$ ), mediated by both dark CP-odd and charged scalars. This is a smoking-gun signal of the 3HDM since it is not allowed in the 2HDM with one inert doublet and is expected to be important when $H_{2}$ and $H_{1}$ are close in mass. In practice, this signature can be observed in the cascade decay of the SM-like Higgs boson, $h \to H_{1} H_{2} \to H_{1} H_{1} f ˉ f$ into two DM particles and di-leptons/di-jets, where $h$ is produced from either gluon-gluon Fusion (ggF) or Vector Boson Fusion (VBF).
hep-phPoS(2019)·1 citation
28*
Can We Observe Jet $P_{T}$ -broadening in Heavy-Ion Collisions at the LHC?
Felix Ringer🇺🇸 · Bo-Wen Xiao🇨🇳 · Feng Yuan🇺🇸
We investigate the effect of PT-broadening on jet substructure observables in heavy-ion collisions at the LHC. As an example, we focus on the opening angle of the two branches that satisfy the soft drop grooming condition in a highly energetic jet. The medium modification of the angular distribution can provide important information on the jet transport properties of hot QCD matter. In addition, we take into account a change of the overall fraction of quark and gluon jets in heavy-ion collisions. We comment on the comparison to a recent measurement from the ALICE Collaboration.
hep-phnucl-exnucl-thPLB(2020)·58 citations
29*
Angular Analysis of \boldmath $Λ_{b} \to Λ_{c} (\to Λ π) ℓ ν ˉ$
Philipp Böer🇩🇪 · Ahmet Kokulu🇩🇪 · Jan-Niklas Toelstede🇩🇪 · Danny van Dyk🇩🇪
We revisit the decay $Λ_{b}^{0} \to Λ_{c}^{+} ℓ^{-} ν ˉ$ ( $ℓ = e, μ, τ$ ) with a subsequent two-body decay $Λ_{c}^{+} \to Λ^{0} π^{+}$ in the Standard Model and in generic New Physics models. The decay's joint four-differential angular distribution can be expressed in terms of ten angular observables, assuming negligible polarization of the initial $Λ_{b}$ state. We present compact analytical results for all angular observables, which enables us to discuss their possible New Physics reach. We find that the decay at hand probes more and complementary independent combinations of Wilson coefficients compared to its mesonic counter parts $B ˉ \to D^{(*)} ℓ^{-} ν ˉ$ . Our result for the angular distribution is at variance with some of the results on scalar-vector interference terms in the literature. We provide numerical estimates for all angular observables based on lattice-QCD results for the $Λ_{b} \to Λ_{c}$ form factors and account for a recent measurement of the parity-violating parameter in $Λ_{c}^{+} \to Λ^{0} π^{+}$ decays by BESIII. A numerical implementation of our results is made publicly available as part of the EOS software.
hep-phhep-exJHEP(2019)·49 citations
30*
LIght scalars with lepton number to solve the $(g - 2)_{e}$ anomaly
Susan Gardner🇺🇸 · Xinshuai Yan🇺🇸
Scalars that carry lepton number can help mediate would-be lepton-number-violating processes, such as neutrinoless double $β$ decay or lepton-scattering-mediated nucleon-antinucleon conversion. Here we show that such new scalars can also solve the anomaly in precision determinations of the fine-structure constant $α$ from atom interferometry and from the electron's anomalous magnetic moment, $a_{e} \equiv (g - 2)_{e} /2$ , by reducing $∣ a_{e} ∣$ . Study of the phenomenological constraints on these solutions favor a doubly-charged scalar with mass below the GeV scale. Significant constraints arise from the measurement of the parity-violating asymmetry in Møller scattering, and we consider the implications of the next-generation MOLLER experiment at Jefferson Laboratory and of an improved $a_{e}$ measurement.
hep-phnucl-thphysics.atom-phPRD(2020)·23 citations
31*
Fermion masses and mixings and some phenomenological aspects of a 3-3-1 model with linear seesaw mechanism
A. E. Cárcamo Hernández🇨🇱 · Nicolás A. Pérez-Julve🇨🇱 · Yocelyne Hidalgo Velásquez🇨🇱
We propose a viable theory based on the $S U (3)_{C} \times S U (3)_{L} \times U (1)_{X}$ gauge group supplemented by the $S_{4}$ discrete group together with other various symmetries, whose spontaneous breaking gives rise to the current SM fermion mass and mixing hierarchy. In the proposed theory the small light active neutrino masses are generated from a linear seesaw mechanism mediated by three Majorana neutrinos. The model is capable of reproducing the experimental values of the physical observables of both quark and lepton sectors. Our model is predictive in the quark sector having 9 effective parameters that allow to successfully reproduce the four CKM parameters and the six Standard Model (SM) quark masses. In the SM quark sector, there is particular scenario, motivated by naturalness arguments, which allows a good fit for its ten observables, with only six effective parameters. We also study the single heavy scalar production via gluon fusion mechanism at proton-proton collider. Our model is also consistent with the experimental constraints arising from the Higgs diphoton decay rate.
hep-phPRD(2019)·33 citations
32*
Centrality in hadron collisions
S.M. Troshin🇷🇺 · N.E. Tyurin🇷🇺
In hadron interactions at the LHC energies, the reflective scattering mode starts to play a role which is expected to be even a more significant beyond the energies of the LHC. This new but still arguable phenomenon implies a peripheral dependence of the inelastic probability distribution in the impact parameter space and asymptotically evolving to the black ring. As a consequence, the straightforward extension to hadrons of the centrality definition adopted for nuclei needs to be modified.
hep-phInt.J.Mod.Phys.A(2019)·4 citations
33*
Acceleration of an unpolarized proton along a uniform magnetic field: Casimir momentum of leptons
Manuel Donaire🇪🇸
It has been recently shown that a chiral molecule accelerates linearly along a spatially uniform magnetic field, as a result of the parity-time symmetry breaking induced in its QED self-interaction. In this work we extend this result to fundamental particles which present EW self-interaction, in which case parity is violated by the EW interaction itself. In particular, we demonstrate that, in a spatially uniform and adiabatically time-varying magnetic field, an unpolarized proton coupled to the leptonic vacuum acquires a kinetic momentum antiparallel to the magnetic field, whereas virtual leptons gain an equivalent $C a s imi r$ $m o m e n t u m$ in the opposite direction. That momentum is proportional to the magnetic field and to the square of Fermi's constant. We prove that the kinetic energy of the proton is a magnetic energy which forms part of its EW self-energy.
hep-phhep-thquant-phJHEP(2019)·2 citations
34*
Determination of the QCD coupling from the static energy and the free energy
Alexei Bazavov🇺🇸 · Nora Brambilla🇩🇪 · Xavier Garcia i Tormo🇪🇸 · Péter Petreczky🇺🇸 · Joan Soto🇪🇸 · Antonio Vairo🇩🇪 · Johannes Heinrich Weber🇺🇸
We present two determinations of the strong coupling $\alpha_s$. The first one is from the static energy at three-loop accuracy, and may be considered an update of earlier determinations by some of us. The new analysis includes new lattice data at smaller lattice spacings, and reaches distances as short as $0.0237\,{\rm fm}$. We present a comprehensive and detailed estimate of the error sources that contribute to the uncertainty of the final result, $α_{s} (M_{Z}) = 0.1166 0_{- 0.00056}^{+ 0.00110}$ . The second determination is based on lattice data for the singlet free energy at finite temperature up to distances as small as $0.0081\,{\rm fm}$, from which we obtain $α_{s} (M_{Z}) = 0.1163 8_{- 0.00087}^{+ 0.00095}$ .
↳ hep-lathep-phPRD(2019)·79 citations
35*
Coherent-Nuclear Pion Photoproduction and Neutron Radii
Gerald A. Miller🇺🇸
{ {\bf Background:} Knowing the difference between the neutron and proton densities of nuclei is a significant topic because of its importance for understanding neutron star structures and cooling mechanisms. The coherent-nuclear photoproduction of pions, $(\g, π^{0})$ , combined with elastic electron scattering, has been suggested to be a very accurate probe of density differences. {\bf Purpose:} Study the $(\g, π^{0})$ reaction mechanism so as to better access the uncertainties involved in extracting the neutron density. {\bf Methods:} Include the effects of final-state pion-nucleus charge-exchange reactions on the cross section and study the influence of the non-zero spatial extent of the proton. {\bf Results:} The effects of final-state charge-exchange increase the cross section between 6\% and 5\%, generally decreasing as the momentum transfer increases. This leads to an increase of the extracted neutron skin distance by about 50\%. The validity of the previous treatments of the proton size is confirmed. {\bf Conclusion:} The model dependence of the theoretically computed cross section increases the total systematic uncertainty (experiment plus theory) in extracting the neutron skin from the $(\g, π^{0})$ cross section by at least a factor of three. }
↳ nucl-thhep-phnucl-exPRC(2019)·11 citations
36*
Dark matter haloes and subhaloes
Jesús Zavala (1)🇮🇸 · Carlos S. Frenk (2) ((1) University of Iceland, (2) ICC Durham)🇬🇧
The development of methods and algorithms to solve the $N$ -body problem for classical, collisionless, non-relativistic particles has made it possible to follow the growth and evolution of cosmic dark matter structures over most of the Universe's history. In the best studied case $-$ the cold dark matter or CDM model $-$ the dark matter is assumed to consist of elementary particles that had negligible thermal velocities at early times. Progress over the past three decades has led to a nearly complete description of the assembly, structure and spatial distribution of dark matter haloes, and their substructure in this model, over almost the entire mass range of astronomical objects. On scales of galaxies and above, predictions from this standard CDM model have been shown to provide a remarkably good match to a wide variety of astronomical data over a large range of epochs, from the temperature structure of the cosmic background radiation to the large-scale distribution of galaxies. The frontier in this field has shifted to the relatively unexplored subgalactic scales, the domain of the central regions of massive haloes, and that of low-mass haloes and subhaloes, where potentially fundamental questions remain. Answering them may require: (i) the effect of known but uncertain baryonic processes (involving gas and stars), and/or (ii) alternative models with new dark matter physics. Here we present a review of the field, focusing on our current understanding of dark matter structure from $N$ -body simulations and on the challenges ahead.
↳ astro-ph.COhep-phGalaxies(2019)·158 citations
37*
Tensor mesons, AdS/QCD and information
Luiz F. Ferreira🇧🇷 · Roldao da Rocha🇧🇷
The Kaluza-Klein tower of higher spin- $S$ tensor meson resonances is here scrutinized in the AdS/QCD hard wall model, encompassing the already established resonances $ρ (770)$ , $f_{2} (1270)$ , $ω_{3} (1670)$ , $f_{4} (2050)$ , $ρ_{5} (2350)$ , $f_{6} (2510)$ in PDG. A hybrid model employs both information theory and AdS/QCD, where configurational-entropic Regge trajectories, relating the configurational entropy of the tensor mesons family to their $S$ spin, and also to their experimental mass spectra, are derived and analyzed. Therefore, the mass spectra of higher spin- $S$ tensor meson resonances is obtained and compared to the existing data in PDG.
↳ hep-thhep-phEPJC(2020)·26 citations
38*
Hybrid star within the framework of a lowest-order constraint variational method
S. Khanmohamadi🇮🇷 · H.R. Moshfegh🇮🇷 · S.Atashbar Tehrani🇮🇷
The hadron-quark phase transition in the core of heavy neutron star (NS) has been studied. For the hadronic sector, we have used the lowest-order constraint variational method by employing $A V_{18}$ , $A V_{14}$ , $U V_{14}$ , and Reid $68$ two-body nucleon-nucleon forces supplemented by the phenomenological Urbana-type three-body force. We have adopted the MIT bag model as well as three-flavor version of the Nambu- Jona-Lasinio (NJL) model to describe the quark phase. The equation of state (EOS) of a hybrid star (HS) is presented by combining two EOS of the hadronic sector and quark sector of a star, which are derived from independent models or theories. The hadron-quark transition is constructed by considering a sharp phase transition, i.e., Maxwell construction. The structure of the HS is calculated and reported by solving Tolman-Oppenheimer-Volkoff equations. Finally the radii and tidal deformability of purely NS and HS for the mass of $1.4 M_{⊙}$ is computed and new constraints on these quantities are checked. The maximum mass of HS is found more than $2 M_{⊙}$ for both the NJL and MIT bag models. However, the maximum mass of $1.796 M_{⊙}$ ( $1.896 M_{⊙}$ ) was the best result that would be calculated for a stable HS with the pure quark core within the MIT (NJL) model. All the hybrid EOS fulfill the constraints on radii and tidal deformability extracted from the binary GW170817 for HSs. A comprehensive analysis on the structure of purely NS and HS and also compactness, tidal Love number, and tidal deformability for the star with the mass of 1.4 $M_{⊙}$ has been conducted for various EOS of the hadron sector and several parameter sets of the quark EOS. The results achieved in this study are in good concurrence with the other calculations reported on this subject.
↳ nucl-thastro-ph.HEhep-phPRD(2020)·12 citations
39*
Energy loss of heavy quarks in the isotropic collisional hot QCD medium
Mohammad Yousuf Jamal🇮🇳 · Vinod Chandra🇮🇳
Collisional energy loss of heavy partons (charm and bottom quarks) has been determined within the framework of semi-classical transport theory implying Bhatnagar-Gross-Krook (BGK) collisional kernel. Hot QCD medium effects have been incorporated while employing a quasi-particle description of the medium in terms of effective gluons, quarks and antiquarks with respective temperature dependent effective fugacities. The momentum dependence of the energy loss for charm and bottom quark has been investigated. It is observed that with the increase in momentum of the heavy quarks, the loss increases sharply for the smaller values and reaches a saturation later. Further, as compared to the charm quark, bottom quark losses less energy at a particular momentum and collisional frequency. The energy loss is seen to increase with increasing collisional frequency. We also provide a comparative study of the results obtained using BGK-kernel than those using relaxation time approximation (RTA)-kernel and found them consistent with each other. The medium effects in all the situations are seen to play quite significant role.
↳ nucl-thhep-phEPJC(2019)·21 citations
40*
Dark matter/new physics searches at BESIII
Vindhyawasini Prasad (for the BESIII Collaboration)🇨🇳
Many new physics models beyond the Standard Model, motivated by the recent astrophysical anomalies, include the possibility of several new types of light weak-interacting particles. Typical models, such as Next-to-Minimal Supersymmetric Standard Model and Hidden Dark-sector Model, predict the light Higgs and dark bosons, respectively. The masses of these particles are expected to be a few GeV and thus making them accessible at BESIII. BESIII has recently explored the possibility of light Higgs and dark bosons in several decay modes using the data-sets collected at $J / ψ$ , $ψ (3686)$ and $ψ (3770)$ resonances. The $J / ψ$ data have further utilized to search for invisible decays of light vector ( $V = ω, ϕ$ ) and pseudo-scalar ( $P = η, η^{'}$ ) mesons via $J / ψ \to V P$ decays. This report summarizes the recent results of the BESIII experiment on these new physics topics.
↳ hep-exhep-phPoS(2020)·9 citations
41*
Parametric-resonance based phenomenology of gravitating axion configurations
Mateja Bošković🇷🇸
One of the most compelling candidates for Dark Matter (DM) are light pseudo-scalar particles (axions), motivated by the strong CP problem and axiverse scenario in string theory. Depending on their mass and type of self-interaction, these particles can build self-gravitating configurations such as compact objects, DM clumps or even galactic DM halos. On the other hand, superradiant instabilities can produce long-living extended configurations (scalar clouds) gravitating around Black Holes (BHs). As these scalars are real and harmonic, their interaction with the other matter components can induce a parametric resonance that might lead to their observable signatures. First, we consider the orbital dynamics of test particles in these axion configurations, show when resonances can occur and discuss the secular evolution of the orbital elements. This scenario can lead to observable consequences for binary pulsars or S stars around the supermassive BH in our Galaxy. Secondly, we discuss electromagnetic (EM) field instabilities in homogeneous axion configurations as well as scalar clouds around Kerr BHs. These axion-photon resonances can quench superradiant instabilities, while producing an observable signature in the EM sector. We give an analytical estimate of the rate of these processes that have good agreement with the fully relativistic numerical simulations and discuss the impact of plasma in the vicinity of BHs on these instabilities.
↳ gr-qcastro-ph.COastro-ph.HEhep-ph4 citations
42*
Smallest QCD Droplet and Multiparticle Correlations in pp Collisions
Seyed Farid Taghavi🇩🇪
The collective evolution of produced matter in heavy-ion collisions is effectively described by hydrodynamics from time scales greater than the inverse of the temperature, $τ ≳ 1/ T$ . In the context of the Gubser solution, I show that the hydrodynamization condition $τ T ≳ 1$ is translated into an allowed domain in the spatial system size and the final multiplicity for hydrodynamics applicability. It turns out that the flow measurements in pp collisions are inside the domain of validity. I predict that by approaching the boundaries of the allowed domain the hydrodynamic response to the initial ellipticity changes its sign. I follow a rather model-independent approach for the initial state where, instead of modeling the initial energy density of individual events, the initial system size and ellipticity event-by-event fluctuation are modeled. The model, initial state fluctuation+Gubser solution+Cooper-Frye freeze-out, describes the multiplicity and transverse momentum dependence of two-point and four-point correlation functions ( $c_{2} {2}$ and $c_{2} {4}$ ) in an accurate agreement with pp collision experimental measurements. In particular, the sign of the four-point correlation function is the same as the observation, which failed to be described correctly in previous studies. I also predict a signal for the sign change in the hydrodynamic response that can be inspected in future experimental measurements of two-point and four-point correlation functions at lower multiplicities.
↳ nucl-thhep-phnucl-exPRC(2021)·11 citations
43*
Thermodynamic interpretation of the de Sitter swampland conjecture
Min-Seok Seo🇰🇷
We interpret the de Sitter swampland conjecture in the thermodynamic point of view. When the number of degrees of freedom is enhanced as the modulus rolls down the potential, the bound on $m_{Pl} \nabla V / V$ is equivalent to the condition for the positive temperature phase. The boundary between the positive- and the negative temperature phases is preferred by the classical system since the entropy density is maximized. The distance conjecture imposes that (quasi-)de Sitter spacetime is entirely in the negative temperature phase and statistically disfavored. By investigating the concave potential, we also justify the bound on $m_{Pl}^{2} \nabla^{2} V / V$ .
↳ hep-thgr-qchep-phPLB(2019)·16 citations
44*
Coupled vector dark energy
Shintaro Nakamura🇯🇵 · Ryotaro Kase🇯🇵 · Shinji Tsujikawa🇯🇵
We provide a general framework for studying the evolution of background and cosmological perturbations in the presence of a vector field $A_{μ}$ coupled to cold dark matter (CDM). We consider an interacting Lagrangian of the form $Q f (X) T_{c}$ , where $Q$ is a coupling constant, $f$ is an arbitrary function of $X = - A_{μ} A^{μ} /2$ , and $T_{c}$ is a trace of the CDM energy-momentum tensor. The matter coupling affects the no-ghost condition and sound speed of linear scalar perturbations deep inside the sound horizon, while those of tensor and vector perturbations are not subject to modifications. The existence of interactions also modifies the no-ghost condition of CDM density perturbations. We propose a concrete model of coupled vector dark energy with the tensor propagation speed equivalent to that of light. In comparison to the $Q = 0$ case, we show that the decay of CDM to the vector field leads to the phantom dark energy equation of state $w_{DE}$ closer to $- 1$ . This alleviates the problem of observational incompatibility of uncoupled models in which $w_{DE}$ significantly deviates from $- 1$ . The maximum values of $w_{DE}$ reached during the matter era are bounded from the CDM no-ghost condition of future de Sitter solutions.
↳ gr-qcastro-ph.COhep-phhep-thJCAP(2019)·24 citations
45*
Lefschetz-thimble inspired analysis of the Dykhne-Davis-Pechukas method and an application for the Schwinger Mechanism
Kenji Fukushima🇯🇵 · Takuya Shimazaki🇯🇵
Dykhne-Davis-Pechukas (DDP) method is a common approximation scheme for the transition probability in two-level quantum systems, as realized in the Landau-Zener effect, leading to an exponentially damping form comparable to the Schwinger pair production rate. We analyze the foundation of the DDP method using a modern complex technique inspired by the Lefschetz-thimble method. We derive an alternative and more adaptive formula that is useful even when the DDP method is inapplicable. As a benchmark, we study the modified Landau-Zener model and compare results from the DDP and our methods. We then revisit a derivation of the Schwinger Mechanism of particle production under electric fields using the DDP and our methods. We find that the DDP method gets worse for the Sauter type of short-lived electric pulse, while our method is still a reasonable approximation. We also study the Dynamically Assisted Schwinger Mechanism in two methods.
↳ quant-phcond-mat.str-elhep-phhep-thAnnals Phys.(2020)·12 citations
46*
Conservation laws and Exact Solutions in Brans-Dicke Cosmology with a Scalar Field
Andronikos Paliathanasis🇿🇦
Scalar-tensor theories have drawn the attention of cosmologist for the past few years because they can provide mechanism to explain the observable phenomena. Moreover, the results of scalar-tensor theories can be applied in higher-order theories of gravity. In this work, we consider a Brans-Dicke scalar field cosmological model that includes a second scalar field minimally coupled to gravity. For the second scalar field we consider the two cases that there exist and there is not any interaction with the Brans-Dicke scalar field. For the two models of our consideration we prove the existence of scaling and de Sitter solutions. Furthermore, we perform an Obsiannikov's classification for the field equations, where we find all the point and contact transformations which leave the gravitational Action Integral invariant. Conservation laws are determined and we show how these can be applied to infer about the integrability of the cosmological models and find new analytic solutions.
↳ gr-qchep-phmath-phmath.MPGen.Rel.Grav.(2019)·15 citations
47*
Ruling out the supersoft high-density symmetry energy from the discovery of PSR J0740+6620 with mass $2.1 4_{- 0.09}^{+ 0.10} M_{⊙}$
Ying Zhou🇨🇳 · Lie-Wen Chen🇨🇳
Using the very recently reported mass $2.1 4_{- 0.09}^{+ 0.10} M_{⊙}$ of PSR J0740+6620 together with the data of finite nuclei and the constraints on the equation of state of symmetric nuclear matter at suprasaturation densities from flow data in heavy-ion collisions, we show that the symmetry energy $E_{sym} (n)$ cannot be supersoft so that it becomes negative at suprasaturation densities in neutron stars (NSs) and thus may make the NS have a pure neutron matter core. This is in contrast to the fact that using the mass $2.01 \pm 0.04 M_{⊙}$ of PSR J0348+0432 as the NS maximum mass cannot rule out the supersoft high-density $E_{sym} (n)$ . Furthermore, we find the stiffer high-density $E_{sym} (n)$ based on the existence of $2.14 M_{⊙}$ NSs leads to a strong constraint of $Λ_{1.4} \geq 34 8_{- 51}^{+ 88}$ for the dimensionless tidal deformability of the canonical $1.4 M_{⊙}$ NS.
↳ nucl-thastro-ph.HEastro-ph.SRhep-ph+1ApJ(2019)·33 citations
48*
High-Energy Multi-Messenger Transient Astrophysics
Kohta Murase (PSU)🇺🇸 · Imre Bartos (U. Florida)🇺🇸
The recent discoveries of high-energy cosmic neutrinos and gravitational waves from astrophysical objects have led to the new era of multi-messenger astrophysics. In particular, electromagnetic follow-up observations triggered by these cosmic signals proved to be highly successful and brought about new opportunities in the time-domain astronomy. Here we review high-energy particle production in various classes of astrophysical transient phenomena related to black holes and neutron stars, and discuss how high-energy emission can be used to reveal the underlying physics of neutrino and gravitational-wave sources.
↳ astro-ph.HEgr-qchep-phAnn.Rev.Nucl.Part.Sci.(2019)·84 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.