HEP Phenomenology·hep-ph

Wed·Sep 18, 2019Wednesday·September 18, 2019

34 papers—18 primary·16 cross-listed·reconstructed*

01*
Second look to the Polyakov Loop Nambu-Jona-Lasinio model at finite baryonic density
O. Ivanytskyi🇪🇸 · M. Ángeles Pérez-García🇪🇸 · V. Sagun🇵🇹 · C. Albertus🇪🇸
We revisit the Polyakov Loop coupled Nambu-Jona-Lasinio model that maintains the Polyakov loop dynamics in the limit of zero temperature. This is of interest for astrophysical applications in the interior of neutron stars. For this purpose we re-examine the form of the potential for the deconfinement order parameter at finite baryonic densities. Since the modification of this potential at any temperature is formally equivalent to assigning a baryonic charge to gluons, we develop a more general formulation of the present model that cures this spurious effect and is normalized to match the asymptotic behaviour of the QCD equation of state given by $O (α_{s}^{2})$ and partial $O (α_{s}^{3} ln^{2} α_{s})$ perturbative results.
hep-phastro-ph.HEnucl-thPRD(2019)·19 citations
02*
Doubly Charged Scalar at the High-Luminosity and High-Energy LHC
Tessio B. de Melo🇧🇷 · Farinaldo S. Queiroz🇧🇷 · Yoxara Villamizar🇧🇷
Doubly charged scalars are common figures in several beyond the Standard Model studies, especially those related to neutrino masses. In this work, we estimate the High-Luminosity (HL-LHC) and High-Energy LHC (HE-LHC) sensitivity to doubly charged scalars assuming they decay promptly and exclusively into charged leptons. Our study focuses on the fit to the same-sign dilepton mass spectra and it is based on proton-proton collisions at $13$ TeV, $14$ TeV and $27$ TeV with integrated luminosity of $L = 139 f b^{- 1}, 3$ ab $^{- 1}$ and $15$ ab $^{- 1}$ . We find that HL-LHC may probe doubly charged scalars masses up to $2.3$ TeV, whereas HE-LHC can impressively probe masses up to $3$ TeV, conclusively constituting a complementary and important probe to signs of doubly charged scalars in lepton flavor violation decays and lepton-lepton colliders.
hep-phInt.J.Mod.Phys.A(2019)·31 citations
03*
Electroweak strings with dark scalar condensates and their (in)stability
Péter Forgács🇭🇺 · Árpád Lukács🇭🇺
The stability of "visible" electroweak-type cosmic strings is investigated in an extension of the Standard Model (SM) by a minimal dark sector, consisting of a U(1) gauge field, broken spontaneously by a scalar. The "visible" and dark sectors are coupled through a Higgs-portal and a gauge-kinetic mixing term. It is found that strings whose core is "filled" with a dark scalar condensate exhibit better stability properties than their analogues in the SM, when the electroweak mixing angle is close to $θ_{W} = π /2$ . They become unstable as one lets $θ_{W}$ approach its physical value. The instability mechanism appears to be a $W$ -boson condensation mechanism found in previous studies on the stability of electroweak strings.
hep-phhep-thPRD(2020)·4 citations
04*
New-physics searches in $C P$ -violating $η$ muonic decays
Pablo Sanchez-Puertas🇪🇸
In this work we investigate the possibility to observe $C P$ -violation in $η$ decays containing muons at the proposed REDTOP experiment. Employing the SMEFT to parametrize the new-physics $C P$ -violating effects, we find that a single operator exists for which is possible to observe $C P$ -violation at REDTOP in $η \to μ^{+} μ^{-}$ decays, while evading bounds from the neutron electric dipole moment and $D^{-} \to μ ν ˉ$
hep-phNucl.Part.Phys.Proc.(2021)·7 citations
05*
Wolfenstein potentials for neutrinos induced by ultra-light mediators
Alexei Yu. Smirnov🇩🇪 · Xun-Jie Xu🇩🇪
New physics can emerge at low energy scales, involving very light and very weakly interacting new particles. These particles can mediate interactions between neutrinos and usual matter and contribute to the Wolfenstein potential relevant for neutrino oscillations. We compute the Wolfenstein potential in the presence of ultra-light scalar and vector mediators and study the dependence of the potential on the mediator mass $m_{A}$ , taking the finite size of matter distribution (Earth, Sun, supernovae) into consideration. For ultra-light mediators with $m_{A}^{- 1}$ comparable to the size of the medium ( $R$ ), the usual $m_{A}^{- 2}$ dependence of the potential is modified. In particular, when $m_{A}^{- 1} ≫ R$ , the potential does not depend on $m_{A}$ . Taking into account existing bounds on light mediators, we find that for the scalar case significant effects on neutrino propagation are not possible, while for the vector case large matter effects are allowed for $m_{A} \in [2 \times 1 0^{- 17}$ , $4 \times 1 0^{- 14}]$ eV and the gauge coupling $g \sim 1 0^{- 25}$ .
hep-phJHEP(2019)·77 citations
06*
The 2-Neutrino-Exchange Potential with Mixing: A New Arena for Neutrino Mixing and CP-Violation
Q. Le Thien🇺🇸 · D. E. Krause🇺🇸
The 2-neutrino exchange potential (2NEP) is a Standard Model (SM) weak potential due to the exchange of virtual neutrino-antineutrino pairs. Consequently, many aspects of neutrino physics, such as the number of flavors, their masses, fermionic nature (Dirac or Majorana), low-energy neutrino physics and CP-violation, can be examined via the 2NEP. We present a new approach for calculating the 2NEP taking into account the phenomenon of neutrino mixing and CP-violation which arises from the structure of the SM weak interaction Lagrangian. Lastly, we explore implications of our result in various physical contexts.
hep-ph0 citations
07*
Neutrino oscillation analysis of 217 live-days of Daya Bay and 500 live-days of RENO
Mario A. Acero🇨🇴 · Alexis A. Aguilar-Arevalo🇲🇽 · Dairo J. Polo-Toledo🇨🇴
We present a neutrino oscillation analysis of two particular data sets from the Daya Bay and RENO reactor neutrino experiments aiming to study the increase in precision in the oscillation parameters $sin^{2} 2 θ_{13}$ and the effective mass splitting $Δ m_{ee}^{2}$ gained by combining two relatively simple to reproduce analyses available in the literature. For Daya Bay the data from 217 days between December 2011 and July 2012 were used. For RENO we used the data from 500 live days between August 2011 and January 2012. We reproduce reasonably well the results of the individual analyses, both, rate-only and spectral, defining a suitable $χ^{2}$ statistic for each case. Finally, we performed a combined spectral analysis and extract tighter constraints on the parameters, with an improved precision between 30-40\% with respect of the individual analyses considered.
hep-phhep-exAdv.High Energy Phys.(2020)·5 citations
08*
Warped modes in flux compactification of type II b supergravity on the conifold
Marc Chemtob🇫🇷
We examine the Kaluza-Klein theory for warped flux compactifications of type $I I b$ string theory on a Minkowski spacetime $M_{4}$ times a conic Calabi-Yau orientifold $X_{6}$ . The region glued along the internal space directions to the bulk of $X_{6}$ is modeled by the warped undeformed conifold $\calc_{6}$ . The resulting classical vacum solution of Klebanov-Tseytlin solution, valid at large radial distances from the conic singularity, describes a spacetime asymptotic to $A d S_{5}$ times the conifold compact base $T^{1, 1}$ . The metric tensor, axio-dilaton and antisymmetric fields part of the 10-d supergravity multiplet bosonic sector decompose into towers of scalar and tensor fields of fixed mass associated to harmonic modes of $T^{1, 1}$ and $M_{4}$ . The warped throat deformations by compactification effects are described by means of AdS/CFT duality. The applications are developed within the hard wall approximation for a truncated $A d S_{5}$ spacetime ending on flat boundaries. Numerical results are presented for the mass spectra and interactions of a selected set of singlet and charged modes and for the interactions of graviton modes with embedded branes. We examine the possibility that an interacting gas of warped massive modes produced after brane-antibrane inflation might reheat the universe and leave cold dark matter relics.
hep-phhep-th4 citations
09*
Cosmological Relaxation from Dark Fermion Production
Kenji Kadota🇰🇷 · Ui Min🇰🇷 · Minho Son🇰🇷 · Fang Ye🇰🇷
We consider the cosmological relaxation solution to the electroweak hierarchy problem using the fermion production as a dominant friction force. In our approach, neither super-Planckian field excursions nor a large number of e-folds arise, and scanning over thermal Higgs mass squared is avoided. The produced fermions from the relaxion source through the derivative coupling are SM-singlets, what we call dark fermions, and they can serve as the keV scale warm dark matter candidates.
hep-phastro-ph.COhep-thJHEP(2020)·11 citations
10*
$ϵ$ -regular basis for non-polylogarithmic multiloop integrals and total cross section of the process $e^{+} e^{-} \to 2 (Q Q ˉ)$
R.N. Lee🇷🇺 · A.I. Onishchenko🇷🇺
We argue that in many physical calculations where the "eliptic" sectors are involved, one can express the results via iterated integrals with almost all weights being rational. Our method is based on the existence of $ϵ$ -regular basis, which is akin to the $ϵ$ -finite basis defined in Ref. [hep-ph/0601165]. As a demonstration of our technique, we calculate the photon contribution to the total cross section of the production of two $Q Q ˉ$ pairs in the electron-positron collisions.
hep-phJHEP(2019)·24 citations
11*
Type-I thermal leptogenesis in $Z_{3}$ -symmetric three Higgs doublet model
Indrani Chakraborty🇮🇳 · Himadri Roy🇮🇳
Our present work explores the possibility of neutrino mass generation through {\em Type-I see-saw} mechanism and provides an explanation of the baryon asymmetry of the Universe via thermal leptogenesis in the framework of $Z_{3}$ -symmetric three Higgs doublet model (3HDM) augmented with three right-handed neutrinos. Here the thermal leptogenesis is initiated by the out-of-equilibrium decay of the lightest heavy neutrino $N_{1}$ . The constraints arising out of the scalar sector put strong bound on the model parameter $tan β$ , which in turn takes part in the computation of the lepton asymmetry $ϵ$ . Lepton asymmetry being converted partially into the baryon asymmetry by electroweak sphelaron processes, will account for the required baryon asymmetry satisfying the current data. We therefore analyse the parameter space consistent with the constraints arising from neutrino oscillation, lepton asymmetry and baryon asymmetry together, last one being the most stringent one.
hep-phEPJC(2020)·7 citations
12*
Testing electroweak SUSY for muon $g - 2$ and dark matter at the LHC and beyond
Murat Abdughani🇨🇳 · Ken-ichi Hikasa🇯🇵 · Lei Wu🇨🇳 · Jin Min Yang🇨🇳 · Jun Zhao🇨🇳
Given that the LHC experiment has produced strong constraints on the colored supersymmetric particles (sparticles), testing the electroweak supersymmetry (EWSUSY) will be the next crucial task at the LHC. On the other hand, the light electroweakinos and sleptons in the EWSUSY can also contribute to the dark matter (DM) and low energy lepton observables. The precision measurements of them will provide the indirect evidence of SUSY. In this work, we confront the EWSUSY with the muon $g - 2$ anomaly, the DM relic density, the direct detection limits and the latest LHC Run-2 data. We find that the sneutrino DM or the neutralino DM with sizable higgsino component has been excluded by the direct detections. Then two viable scenarios are pinned down: one has the light compressed bino and sleptons but heavy higgsinos, and the other has the light compressed bino, winos and sleptons. In the former case, the LSP and slepton masses have to be smaller than about 350 GeV. While in the latter case, the LSP and slepton masses have to be smaller than about 700 GeV and 800 GeV, respectively. From investigating the observability of these sparticles in both scenarios at future colliders, it turns out that the HE-LHC with a luminosity of 15 ab $^{- 1}$ can exclude the whole BHL and most part of BWL scenarios at $2 σ$ level. The precision measurement of the Higgs couplings at the lepton colliders could play a complementary role of probing the BWL scenario.
hep-phhep-exJHEP(2019)·59 citations
13*
Composite Dynamics in the Early Universe
Stefania De Curtis🇮🇹 · Luigi Delle Rose🇮🇹 · Giuliano Panico🇮🇹
We study the occurrence of a strong first-order electroweak phase transition in composite Higgs models. Minimal constructions realising this scenario are based on the coset SO(6)/SO(5) which delivers an extended Higgs sector with an additional scalar. In such models, a two-step phase transition can be obtained with the scalar singlet acquiring a vacuum expectation value at intermediate temperatures. A bonus of the Nambu-Goldstone boson nature of the scalar-sector dynamics is the presence of non-renormalisable Higgs interactions that can trigger additional sources of CP violation needed to realise baryogenesis at the electroweak scale. Another interesting aspect of this scenario is the generation of gravitational wave signatures that can be observed at future space-based interferometers.
hep-phJHEP(2019)·49 citations
14*
Consistent analysis of $f_{1} (1285)$ meson form factors
A.I. Milstein🇷🇺 · A.S. Rudenko🇷🇺
Parameterization of the form factors of $f_{1} (1285)$ meson is proposed. This parameterization is consistent with the available experimental data on the cross sections of $f_{1} (1285)$ meson production in the processes $e^{+} e^{-} \to f_{1} (1285)$ and $e^{+} e^{-} \to e^{+} e^{-} f_{1} (1285)$ , as well as on the widths of the decays $f_{1} (1285) \to e^{+} e^{-}$ , $f_{1} (1285) \to ρ^{0} γ$ , $f_{1} (1285) \to ρ^{0} π^{+} π^{-}$ , and $f_{1} (1285) \to 2 π^{+} 2 π^{-}$ . Our parameterization is also consistent with the predictions for the asymptotic behavior of these form factors.
hep-phPLB(2020)·16 citations
15*
Higgs Portal to Dark QED
Anirudh Krovi🇺🇸 · Ian Low🇺🇸 · Yue Zhang🇺🇸
We introduce a light dark photon $A_{μ}^{'}$ to the minimal Higgs portal model, by coupling the Higgs boson to "dark QED" containing fermionic dark matter, which gives rise to rich and interesting collider phenomenology. There are two prominent features in such a simple extension -- the Higgs boson could have decays into the long-lived dark photon through the "mono- $A^{'}$ channel," or into multiple collimated leptons via "darkonium," depending on the mixing parameter of the $A_{μ}^{'}$ with the visible photon. We initiate a study on the possibility of probing the parameter space of the model in both the energy and the lifetime frontiers at the Large Hadron Collider.
hep-phhep-exPRD(2020)·6 citations
16*
Ultraviolet Freeze-in and Non-Standard Cosmologies
Nicolás Bernal🇨🇴 · Fatemeh Elahi🇮🇷 · Carlos Maldonado🇨🇱 · James Unwin🇺🇸
A notable feature of UV freeze-in is that the relic density is strongly dependent on the highest temperatures of the thermal bath, and a common assumption is that the relevant 'highest temperature' should be the reheating temperature after inflation $T_{RH}$ . However, the temperature of the thermal bath can be significantly higher in certain scenarios, reaching a value denoted T max , a fact which is only apparent away from the instantaneous decay approximation. Interestingly, it has been shown that if the operators are of sufficiently high mass dimension then the dark matter abundance can be enhanced by a 'boost factor' depending on ( $T_{max} / T_{RH}$ ) relative to naive estimates assuming instantaneous reheating. We highlight here that in non-standard cosmological histories the critical mass dimension of the operator above at which the instantaneous decay approximation breaks down, and the exponent of the boost factor, depend on the equation of state $ω$ prior to reheating. We highlight four examples in which the dark matter abundance receives a significant enhancement in the context of gravitino dark matter, the moduli portal, the Higgs portal, and the spin-2 portal (as might arise in bimetric gravity models). We comment on the transition from kination domination to radiation domination as a motivated example of non-standard cosmologies.
hep-phastro-ph.COJCAP(2019)·138 citations
17*
Explaining the ANITA events by a $L_{e} - L_{τ}$ gauge model
Arman Esmaili🇧🇷 · Yasaman Farzan🇮🇷
The ANITA experiment has registered two anomalous events that can be interpreted as $ν_{τ}$ or $ν ˉ_{τ}$ with a very high energy of $O (0.6)$ ~EeV emerging from deep inside the Earth. At such high energies, the Earth is opaque to neutrinos so the emergence of these neutrinos at such large zenith angles is a mystery. In our paper, we present a model that explains the two anomalous events through a $L_{e} - L_{τ}$ gauge interaction involving two new Weyl fermions charged under the new gauge symmetry. We find that, as a bonus of the model, the lighter Weyl fermion can be a dark matter component. We discuss how the ANITA observation can be reconciled with the IceCube and Auger upper bounds. We also demonstrate how this model can be tested in future by collider experiments.
hep-phastro-ph.HEJCAP(2019)·27 citations
18*
Baryon String-Junction Torus: an Appearance in High Energy Proton Collisions
Olga I. Piskounova🇷🇺
The topological presentation of pomeron exchange at the proton-proton collision of high energy is cylinder that is covered with the net of quark-gluon exchanges. I suggest that the process of double diffraction dissociation (DD) can be presented as one pomeron exchange with the central loop of two uncut pomeron cylinders. Taking into account that the junction of three gluon strings (SJ) has the positive baryon number, as well as the antijunction is of negative baryon charge, our neutral pomeron torus can be covered with only a certain number of hexagons that are built of 3 junction and 3 antijunction each. This image is similar somehow to graphene tube. It is reasonable to expect that the dynamics of rapidity gaps in DD should be determined by the number of hexagons on the surface of pomeron torus. Therefore, the gap distribution in DD events has the discrete structure in the region of large gaps. Moreover, the SJ torus can be released in pp interactions as metastable particle and is getting suspected as Dark Matter candidate. The possibility of production of multi-quark states with few string junctions has been discussed recently by G.C. Rossi and G. Veneziano.
hep-phhep-th1 citation
19*
Constraints in modeling the quasielastic response in inclusive lepton-nucleus scattering
R. González-Jiménez🇪🇸 · M.B. Barbaro🇮🇹 · J.A. Caballero🇪🇸 · T.W. Donnelly🇺🇸 · N. Jachowicz🇧🇪 · G.D. Megias🇪🇸 · K. Niewczas🇧🇪 · A. Nikolakopoulos🇧🇪 · J.M. Udías🇪🇸
We show that the quasielastic (QE) response calculated with the SuSAv2 (superscaling approach) model, that relies on the scaling phenomenon observed in the analysis of (e,e') data and on the relativistic mean-field theory, is very similar to that from a relativistic distorted wave impulse approximation model when only the real part of the optical potentials is employed. The coincidence between the results from these two completely independent approaches, which satisfactorily agree with the inclusive data, reinforces the reliability of the quasielastic predictions stemming from both models and sets constraints for the QE response. We also study the low energy and momentum transfer region of the inclusive response by confronting the results of the relativistic mean-field model with those of the Hartree-Fock continuum random-phase approximation model, which accounts for nuclear long-range correlations. Finally, we present a comparison of our results with the recent JLab (e,e') data for argon, titanium and carbon, finding good agreement with the three data sets.
↳ nucl-thhep-phPRC(2020)·55 citations
20*
Search for invisible decays of the Higgs boson at the ILC
Akimasa Ishikawa🇯🇵
The existence of dark matter has been established in astrophysics. However, there are no dark matter candidates in the Standard Model~(SM). If the dark matter particles or their mediator can not interact with SM fermions or gauge bosons, the Higgs boson is the only portal to the dark matter. We present a simulation study to search for invisible decays of the Higgs boson at the ILC with the ILD detector.
↳ hep-exhep-phPoS(2019)·10 citations
21*
Gamma-ray luminosity function of BL Lac objects and contribution to the extragalactic gamma-ray background
Yankun Qu🇨🇳 · Houdun Zeng🇨🇳 · Dahai Yan🇨🇳
Using a significantly enlarged \textit{Fermi}-LAT BL Lac objects (BL Lacs) sample, we construct the gamma-ray luminosity function (GLF) of BL Lacs, by the joint use of the space density distribution and source counts distribution. We use three well-studied forms of the GLF, i.e., the forms of pure density evolution (PDE), pure luminosity evolution (PLE) and luminosity-dependent density evolution (LDDE). The Markov Chain Monte Carlo (MCMC) technique is used to constrain model parameters. Our results suggest that LDDE model can give the best description for the BL Lac GLF. And the model shows that the BL Lacs with a harder GeV spectrum and a less luminosity evolve as strongly as FSRQs, and the evolution decreases as increasing luminosity. We also model the average photon spectra of BL Lacs with a double power laws model. Using this modeled spectra, BL Lacs contribute $\sim 20%$ of the total extragalactic gamma-ray background (EGB) at $E > 100$ MeV, $\sim 100%$ of the EGB at $E > 50$ GeV, and the unresolved BL Lacs contribute $\sim 20%$ of the isotropic diffuse gamma-ray background (IGRB) at $E > 100$ MeV. A prediction of the TeV EGB spectra are given, which may be tested by the future detectors.
↳ astro-ph.HEhep-phMNRAS(2019)·28 citations
22*
Primordial Tensor Non-Gaussianity from Massive Gravity
Tomohiro Fujita🇯🇵 · Shuntaro Mizuno🇯🇵 · Shinji Mukohyama🇯🇵
We calculate tensor bispectrum in a theory of massive tensor gravitons which predicts blue-tilted and largely amplified primordial gravitational waves. We find that a new 3-point interaction can produce a larger tensor bispectrum than the conventional one from general relativity. The bispectrum peaks at the squeezed configuration and its slope towards the squeezed limit is determined by the graviton mass. This squeezed tensor bispectrum may be observed as the quadrupolar modulation of the tensor power spectrum by interferometers.
↳ astro-ph.COgr-qchep-phhep-thJCAP(2020)·12 citations
23*
QCD Kondo excitons
Daiki Suenaga🇨🇳 · Kei Suzuki🇯🇵 · Shigehiro Yasui🇯🇵
The quantum chromodynamics (QCD) Kondo effect is a quantum phenomenon in which heavy quarks ( $c$ , $b$ ) exist as impurity particles in quark matter composed of light quarks ( $u$ , $d$ , $s$ ) at extremely high density. This is analogous to the famous Kondo effect in condensed matter physics. In the present paper, we show theoretically the existence of the "QCD Kondo excitons", i.e., the bound states of light quarks and heavy quarks, as the lowest-excitation modes above the ground state of the quark matter governed by the QCD Kondo effect. These are neutral for color and electric charges, similarly to the Kondo excitons in condensed matter, and they are new type of quasiparticles absent in the normal phase of quark matter. The QCD Kondo excitons have various masses and quantum numbers, i.e., flavors and spin parities (scalar, pseudoscalar, vector, and axialvector). The QCD Kondo excitons lead to the emergence of the neutral currents in transport phenomena, which are measurable in lattice QCD simulations. The study of the QCD Kondo excitons will provide us with understanding of new universal properties shared by quark matter and condensed matter.
↳ nucl-thcond-mat.str-elhep-phPRResearch(2020)·12 citations
24*
Structural Properties of Rotating Hybrid Compact Stars with Color-Flavour-Locked Quarks Matter core and its Tidal Deformability
Suman Thakur🇮🇳 · Shashi K Dhiman🇮🇳
We investigate the possible sequels, for the hybrid compact stars consisting of nucleons, hyperons and three flavour color-flavor-locked quarks phase under global neutrality and chemical equilibrium conditions. The hadron equations of state are computed within the framework of energy density functionals based on the relativistic mean field theory by employing two different model parameterizations. The quarks matter phase of equation of state is computed by using Quarks Quasiparticle model derived from a non-relativistic energy density-functional approach. A plausible set of hybrid equations of state for superdense hadron-quarks matter is obtained and, which satisfies the constraints provided by bulk nuclear matter, the observational data of frequencies and maximum Gravitational mass 2 $M_{⊙}$ with their extracted radii, Keplerian limits, secular axisymmetric instability and limits of tidal deformabilities from GW170817 binary neutron stars (BNS) merger. We obtained structural properties of nonrotating and rotating compact stars, the evolutionary sequences with constant baryonic mass star spinning down by electromagnetic and gravitational radiations and, discuss the issues relating to phase transition from hadrons to quarks matter phase. The internal structure of rotating star with observed spin down frequencies, exhibiting shrinkage of soft quarks core of compact stars are discussed for constant baryonic mass. We present the theoretically computed limits of radii for the spin down configurations of hybrid stars corresponding to the recently observed millisecond pulsars. We also present and discuss the calculated results for tidal deformability, $Λ$ and tidal parameters $Λ_{1}$ , $Λ_{2}$ of non spining hybrid star which are consistent with the waveform model analysis of GW170817 BNS.
↳ nucl-thastro-ph.COhep-ph1 citation
25*
Production of $ϕ (2170)$ and $η (2225)$ in a kaon induced reaction
Xiao-Yun Wang🇨🇳 · Jun He🇨🇳
In this work, we study the production of strange quarkoniums, the $ϕ (2170)$ , also named $Y (2175)$ , and the $η (2225)$ , via a kaon induced reaction on a proton target in an effective Lagrangian approach. The total and differential cross sections of the reactions $K^{-} p \to ϕ (2170) Λ$ and $K^{-} p \to η (2225) Λ$ are calculated by the Reggeized $t$ -channel Born term under an assumption that the $ϕ (2170)$ and $η (2225)$ are $Λ Λ ˉ$ molecular states. At the center of mass energies of about 4.2 GeV, the total cross section for the $ϕ (2170)$ production is predicted to be about 1 $μ$ b. The numerical results indicate that it is feasible to produce the $ϕ (2170)$ via kaon beam scattering at the best energy window near 4.2 GeV. The total cross section for the $η (2225)$ production is smaller than that for the $ϕ (2170)$ production and it may reach an order of the magnitude of 0.1 $μ$ b. The differential cross sections for both reactions at different center of mass energies are also presented. It is found that the Reggeized $t$ channel gives a considerable contribution at forward angles. As the energy increases, the contribution from the $t$ -channel almost concentrates at extreme forward angles. From these theoretical predictions, the relevant experimental research is suggested, which could provide important information to clarify the internal structure and production mechanism of these two strange quarkoniums.
↳ nucl-thhep-phnucl-exEPJA(2019)·14 citations
26*
Realizing a scalable building block of a U(1) gauge theory with cold atomic mixtures
Alexander Mil🇩🇪 · Torsten V. Zache🇩🇪 · Apoorva Hegde🇩🇪 · Andy Xia🇩🇪 · Rohit P. Bhatt🇩🇪 · Markus K. Oberthaler🇩🇪 · Philipp Hauke🇮🇹 · Jürgen Berges🇩🇪 · Fred Jendrzejewski🇩🇪
In the fundamental laws of physics, gauge fields mediate the interaction between charged particles. An example is quantum electrodynamics -- the theory of electrons interacting with the electromagnetic field -- based on U(1) gauge symmetry. Solving such gauge theories is in general a hard problem for classical computational techniques. While quantum computers suggest a way forward, it is difficult to build large-scale digital quantum devices required for complex simulations. Here, we propose a fully scalable analog quantum simulator of a U(1) gauge theory in one spatial dimension. To engineer the local gauge symmetry, we employ inter-species spin-changing collisions in an atomic mixture. We demonstrate the experimental realization of the elementary building block as a key step towards a platform for large-scale quantum simulations of continuous gauge theories.
↳ cond-mat.quant-gashep-phphysics.atom-phquant-phScience(2020)·297 citations
27*
$Υ (1 S)$ transverse momentum spectra through dissociation and regeneration in heavy ion collisions
Juhee Hong🇰🇷 · Su Houng Lee🇰🇷
We calculate the transition between a quarkonium state and an unbound heavy quark-antiquark pair through gluo-dissociation and inelastic parton scattering using a partonic picture that interpolates between the formal limits based on potential nonrelativistic QCD (pNRQCD) at different temperatures. While the thermal width increases with momentum and temperature, the quarkonium regeneration is affected by the heavy quark distribution function which depends on the diffusion constant. By solving the Boltzmann equation with the dissociation and regeneration terms, we investigate the medium modifications of quarkonium momentum spectra. Our numerical results indicate that the $Υ (1 S)$ $R_{AA}$ at high transverse momentum are influenced by the regeneration effects depending on the heavy quark diffusion. In this picture, the published CMS data that show an almost transverse momentum independence can be explained by the interplay between the suppression by dissociation and enhancement by regeneration at low and high transverse momenta, respectively. With the same input, we also calculate the transverse momentum dependence of the $Υ (1 S)$ $v_{2}$ and show that it lies within the limits of the available data.
↳ nucl-thhep-phPLB(2020)·22 citations
28*
Microscopic study of strange hadron productions at the LHC with $s_{N N}$ =2.76 TeV
Purabi Ghosh🇮🇳 · Jajati K. Nayak🇮🇳 · Sushant K. Singh🇮🇳 · Santosh K. Agarwalla🇮🇳
Ratio of the yield of strange hadrons to pions is considered as an important observable in studying the properties of the system produced in relativistic heavy ion collisions. Production of strange hadrons $K, K ˉ, Λ, Σ, Ξ$ and $Ω$ have been evaluated microscopically using rate equations by considering their hadronic interaction cross sections in an expanding medium. The yields obtained from rate equations are normalized with thermal pions and compared with the measurements from Pb-Pb collisions at various multiplicities at LHC energy. The calculation has been done for various initial and freeze out conditions. At 2760 GeV, LHC energy, $Λ, Ξ, Ω$ freeze out close to $T_{C}$ and $K_{s}^{0}$ freezes out little later. But there is a subtle difference in freeze out temperatures of different species which may be distinguishable at lower colliding energies.
↳ nucl-thhep-exhep-phnucl-exPRD(2020)·7 citations
29*
Impact of the PDFs on the Z and W lineshapes at LHC
Valerio Bertacchi🇮🇹 · Lorenzo Bianchini🇮🇹 · Elisabetta Manca🇮🇹 · Gigi Rolandi🇮🇹 · Suvankar Roy Chowdhury🇮🇹
The parton distribution functions (PDFs) of the proton play a role in determining the lineshape of $Z$ and $W$ bosons produced at the LHC. In particular, the mode of the gauge boson virtuality is shifted with respect to the pole due to the dependence of the partonic luminosity on the boson virtuality. The knowledge of this shift contributes to the systematic uncertainty for a direct measurement of the boson mass. A detailed study of the shift and of its systematic uncertainty due to the limited knowledge of the PDFs is obtained using a tree-level model of $Z$ and $W$ boson production in proton-proton collisions at $s = 13$ TeV. A Monte Carlo simulation is further used to validate the tree-level model and study the dependence of the shift on the transverse momentum of the gauge bosons. The tree-level calculation is found to provide a good description of the shift. The systematic uncertainty on the lineshape due to the PDFs is estimated to be below one MeV in the phase-space relevant for a future high-precision mass measurement of the gauge boson masses at the LHC.
↳ hep-exhep-phEPJC(2020)·3 citations
30*
Efficient Cosmological Analysis of the SDSS/BOSS data from the Effective Field Theory of Large-Scale Structure
Thomas Colas🇺🇸 · Guido D'Amico🇺🇸 · Leonardo Senatore🇺🇸 · Pierre Zhang🇨🇳 · Florian Beutler🇬🇧
The precision of the cosmological data allows us to accurately approximate the predictions for cosmological observables by Taylor expanding up to a low order the dependence on the cosmological parameters around a reference cosmology. By applying this observation to the redshift-space one-loop galaxy power spectrum of the Effective Field Theory of Large-Scale Structure, we analyze the BOSS DR12 data by scanning over all the parameters of $Λ$ CDM cosmology with massive neutrinos. We impose several sets of priors, the widest of which is just a Big Bang Nucleosynthesis prior on the current fractional energy density of baryons, $Ω_{b} h^{2}$ , and a bound on the sum of neutrino masses to be less than 0.9 eV. In this case we measure the primordial amplitude of the power spectrum, $A_{s}$ , the abundance of matter, $Ω_{m}$ , the Hubble parameter, $H_{0}$ , and the tilt of the primordial power spectrum, $n_{s}$ , to about $19%$ , $5.7%$ , $2.2%$ and $7.3%$ respectively, obtaining $ln (1 0^{10} A_{s}) = 2.91 \pm 0.19$ , $Ω_{m} = 0.314 \pm 0.018$ , $H_{0} = 68.7 \pm 1.5$ km/(s Mpc) and $n_{s} = 0.979 \pm 0.071$ at $68%$ confidence level. A public code is released with this preprint.
↳ astro-ph.COgr-qchep-phhep-thJCAP(2020)·199 citations
31*
Fate of a neutron star with an endoparasitic black hole and implications for dark matter
William E. East🇨🇦 · Luis Lehner🇨🇦
We study the dynamics and observational signatures of a neutron star being consumed by a much less massive black hole residing inside the star. This phenomenon could arise in a variety of scenarios, including after the capture of a primordial black hole, or in some models of asymmetric dark matter where the dark matter particles collect at the center of a neutron star and eventually collapse to form a black hole. However, the details of how the neutron star implodes are not well known, which is crucial to determining the observational implications of such events. We utilize fully general relativistic simulations to follow the evolution of such a black hole as it grows by several orders of magnitude, and ultimately consumes the neutron star. We consider a range of spin values for the neutron star, from non-rotating stars, to those with millisecond periods, as well as different equations of state. We find that as the black hole grows, it obtains a non-negligible spin and induces differential rotation in the core of the neutron star. In contrast to previous studies, we find that the amount of dynamical ejecta is very small, even for rapidly rotating stars, dampening the prospects for producing a kilonova-type electromagnetic signal from such events. We comment on other possible electromagnetic and gravitational signals.
↳ gr-qcastro-ph.HEhep-phPRD(2019)·49 citations
32*
Are Milky-Way dwarf-spheroidal galaxies dark-matter free?
F. Hammer🇫🇷 · Y. B. Yang🇫🇷 · J. L. Wang🇫🇷 · F. Arenou🇫🇷 · C. Babusiaux🇫🇷 · M. Puech🇫🇷 · H. Flores🇫🇷
We have found that the high velocity dispersions of dwarf spheroidal galaxies (dSphs) can be well explained by Milky Way (MW) tidal shocks, which reproduce precisely the gravitational acceleration previously attributed to dark matter (DM). Here we summarize the main results of Hammer et al. (2019) who studied the main scaling relations of dSphs and show how dark-matter free galaxies in departure from equilibrium reproduce them well, while they appear to be challenging for the DM model. These results are consistent with our most recent knowledge about dSph past histories, including their orbits, their past star formation history and their progenitors, which are likely tiny dwarf irregular galaxies.
↳ astro-ph.GAgr-qchep-ph0 citations
33*
Constraining Dark-Matter Ensembles with Supernova Data
Aditi Desai🇺🇸 · Keith R. Dienes🇺🇸 · Brooks Thomas🇺🇸
The constraints on non-minimal dark sectors involving ensembles of unstable dark-matter species are well established and quite stringent in cases in which these species decay to visible-sector particles. However, in cases in which these ensembles decay exclusively to other, lighter dark-sector states, the corresponding constraints are less well established. In this paper, we investigate how information about the expansion rate of the universe at low redshifts gleaned from observations of Type Ia supernovae can be used to constrain ensembles of unstable particles which decay primarily into dark radiation.
↳ astro-ph.COhep-phPRD(2020)·22 citations
34*
The Shape of the Correlation Function
Jakub Cimerman🇨🇿 · Christopher Plumberg🇸🇪 · Boris Tomášik🇸🇰
The two-particle correlation function employed in Hanbury-Brown Twiss interferometry and femtoscopy is traditionally parameterized by a Gaussian form. Other forms, however, have also been used, including the somewhat more general Lévy form. Here we consider a variety of effects present in realistic femtoscopic studies which may modify the shape of the correlation function and thereby influence the physical interpretation of a given parameterization.
↳ nucl-thhep-phnucl-exPhys.Part.Nucl.(2020)·8 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.