HEP Phenomenology·hep-ph

Fri·Jun 24, 2022Friday·June 24, 2022

31 papers—25 primary·6 cross-listed·reconstructed*

01*
Dark Matter Dilution Mechanism through the Lens of Large Scale Structure
Miha Nemevšek🇸🇮 · Yue Zhang🇨🇦
Entropy production is a necessary ingredient for addressing the over-population of thermal relics. It is widely employed in particle physics models for explaining the origin of dark matter. A long-lived particle that decays to the known particles, while dominating the universe, plays the role of the dilutor. We point out the impact of its partial decay to dark matter on the primordial matter power spectrum. For the first time, we derive a stringent limit on the branching ratio of the dilutor to dark matter from large scale structure observation using the SDSS data. This offers a novel tool for testing models with a dark matter dilution mechanism. We apply it to the left-right symmetric model and show that it firmly excludes a large portion of parameter space for right-handed neutrino warm dark matter.
hep-phastro-ph.COPRL(2023)·25 citations
02*
Resonance production in partial chemical equilibrium
Sandor Lokos🇭🇺 · Boris Tomasik🇨🇿
In high energy collisions, a dense, strongly interacting medium could be created, the quark gluon plasma. In rapid expansion, from the soup of quarks and gluons a gas of resonance and stable particles is formed at the chemical freeze-out and after that, as the system cools down, the kinetic freeze-out takes place and interaction between particles ceases. By measuring resonance ratios one could get information about the dominant physical processes in the intermediate temperature ranges, i.e. between the chemical and kinetic freeze-out. These quantities are measured at RHIC and LHC energies. In the present analysis we employ the hadron resonance gas model assuming partial chemical equilibrium to characterize these measured data. We calculate the ratios of several resonances to their stable counterpart and compare these model calculations to available experimental data.
hep-phPRC(2022)·4 citations
03*
The $B$ Anomalies, the $U_{1}$ Leptoquark and Dark Matter
Geneviève Bélanger🇫🇷 · Jacky Kumar🇨🇦 · David London🇨🇦 · Alexander Pukhov🇷🇺
The present-day $B$ -anomalies involving $b \to s μ^{+} μ^{-}$ or $b \to c τ^{-} ν ˉ$ transitions can all be explained with the addition of a vector $U_{1}$ leptoquark with a mass of $M_{U_{1}} \geq 1.8$ TeV. In the scalar singlet dark matter model (SSDMM), the DM is a scalar $S$ that couples to the Higgs via $λ_{h S} S^{2} ∣ H ∣^{2}$ . We update the fit to the data and find that the SSDMM is now viable only for $M_{S} \geq 1.6$ TeV. In this paper, we assume that the DM also couples to the $U_{1}$ via $λ_{U_{1} S} S^{2} U_{1 μ}^{†} U_{1}^{μ}$ . In addition to leading to DM annihilation via $S S \to U_{1} U ˉ_{1}$ , this coupling generates $S S g g$ and $S S γ γ$ couplings at one loop. Although naively divergent, these loop diagrams can be calculated under the assumption that the $U_{1}$ is a gauge boson of a group broken at the TeV scale. With this DM- $U_{1}$ coupling term, there are additional contributions to the various DM observables (relic density, direct and indirect detection). We find that the constraints on the SSDMM are relaxed for both heavy DM ( $M_{S} \geq M_{U_{1}}$ ) and light DM ( $M_{S} < M_{U_{1}}$ ).
hep-phJHEP(2023)·8 citations
04*
Baryogenesis and Dark Matter in Multiple Hidden Sectors
Hassan Easa🇨🇦 · Thomas Gregoire🇨🇦 · Daniel Stolarski🇨🇦 · Catarina Cosme🇨🇦
We explore a mechanism for producing the baryon asymmetry and dark matter in models with multiple hidden sectors that are Standard-Model-like but with varying Higgs mass parameters. If the field responsible for reheating the Standard Model and the exotic sectors carries an asymmetry, it can be converted into a baryon asymmetry using the standard sphaleron process. A hidden sector with positive Higgs mass squared can accommodate dark matter with its baryon asymmetry, and the larger abundance of dark matter relative to baryons is due to dark sphalerons being active all the way down the hidden sector QCD scale. This scenario predicts that dark matter is clustered in large dark nuclei and gives a lower bound on the effective relativistic degrees of freedom, $Δ N_{eff} ≳ 0.05$ , which may be observable in the next-generation cosmic microwave background experiment CMB-S4.
hep-phastro-ph.COPRD(2024)·11 citations
05*
Rare decays of b and c hadrons
Wolfgang Altmannshofer🇺🇸 · Flavio Archilli🇩🇪
In this white paper for the Snowmass process, we review the status and prospects of the field of rare decays of b and c hadrons. The role that rare decays play in the search for physics beyond the Standard Model is emphasised. We stress the complementarity of a large set of relevant processes and outline the most promising directions. The experimental opportunities at Belle II, BES III, ATLAS, CMS, LHCb, and at future machines are discussed. We also summarize the challenges that need to be addressed on the theory side to achieve theory uncertainties for rare decays that match the expected experimental sensitivities.
hep-phhep-ex26 citations
06*
Shear-induced anomalous transport and charge asymmetry of triangular flow in heavy-ion collisions
Matteo Buzzegoli🇺🇸 · Dmitri E. Kharzeev🇺🇸 · Yu-Chen Liu🇺🇸 · Shuzhe Shi🇺🇸 · Sergei A. Voloshin🇺🇸 · Ho-Ung Yee🇺🇸
Chiral anomaly implies the existence of non-dissipative transport phenomena, such as the chiral magnetic effect. At second order in the derivative expansion, novel quantum transport phenomena emerge. In this paper, we focus on the anomalous transport driven by a combination of shear, vorticity and magnetic field. We find that the corresponding transport phenomena -- shear-induced chiral magnetic and chiral vortical effects (siCME and siCVE) -- induce characteristic charge correlations among the hadrons produced in heavy ion collisions. We propose the charge asymmetry of triangular flow as a signature of the anomalous transport, and estimate the strength of the signal, as well as the background, using hydrodynamical model simulations. We find that the signal-to-background ratio for the proposed observable is favorable for experimental detection.
hep-phnucl-exnucl-thPRC(2022)·9 citations
07*
An Effective Field Theory Treatment of the Production and Annihilation of Magnetic Monopoles and their Relic Abundance
Luciano M. Abreu🇧🇷 · Pedro C. S. Brandão🇧🇷 · Marc de Montigny🇨🇦 · Pierre-Philippe A. Ouimet🇨🇦
We revisit the thermal production red and annihilation of magnetic monopoles and their relic abundance in order to gain a deeper physical interpretation on the monopole phenomenology predicted from the Baines et al. effective field theory, recently proposed in the description of monopole pair production via Drell-Yan and photon fusion processes. In this sense, we red use of the vacuum cross sections for the Drell-Yan reactions derived within the mentioned framework to evaluate the cross section averaged over the thermal distribution associated to other particles that constitute the hot medium where the monopoles propagate. In the considered range of monopole mass with spin-zero and spin-half, our findings suggest that the thermally averaged cross sections for the pair production are highly suppressed, while at higher temperatures those for the annihilation of lighter pairs reach larger magnitudes. Besides, we observe that smaller temperature leads to a rate of annihilation for scalar monopoles smaller than the one for fermionic monopoles, which might be interpreted as a theoretical evidence of a more pronounced stability for spin-0 and heavier monopoles.Then we input these thermally averaged cross sections into the kinetic equation that describes the evolution of the monopole abundance via an extension of a freeze-out theory. Our results infer that heavier monopoles achieve the equilibrium at earlier stages of the expansion, and consequently at higher temperatures. In addition, larger monopole masses produce higher values of the relic abundance. Besides, the results indicate that the abundance does not behave differently for spinless and spin-half relic monopoles.
hep-phEPJC(2022)·0 citations
08*
Azimuthal asymmetry in cosmic-ray boosted dark matter flux
Chen Xia🇨🇳 · Yan-Hao Xu🇨🇳 · Yu-Feng Zhou🇨🇳
Light halo dark matter (DM) particles up-scattered by high-energy cosmic rays (referred to as CRDM) can be energetic and become detectable at conventional DM and neutrino experiments. We show that the CRDM flux has a novel and detectable morphological feature. Unlike most of the recently proposed boosted DM (BDM) models which predict azimuthally symmetric DM fluxes around the Galactic Center, the CRDM flux breaks the azimuthal symmetry significantly. Using cosmic-ray electron distribution in the whole Galaxy and optimized search region in the sky according to the morphology of the CRDM flux, we derive so far the most stringent constraints on the DM-electron scattering cross section from the Super-Kamiokande (SK) IV data, which improves the previous constraints from the SK-IV full-sky data by more than an order of magnitude. Based on the improved constraints, we predict that the azimuthal symmetry-breaking effect can be observed in the future Hyper-Kamiokande experiment at $\sim 3 σ$ level.
hep-phPRD(2023)·33 citations
09*
Selected Results in Heavy Quark Fragmentation
Gennaro Corcella🇮🇹
I review a few selected topics concerning heavy-quark fragmentation, taking particular care about bottom- and charm-quark production in $e^{+} e^{-}$ annihilation and the inclusion of non-perturbative corrections. In particular, I discuss recent developments of calculations carried out in the framework of perturbative fragmentation functions and the perspective to extend them to other processes and higher accuracy. Special attention is paid to the use of an effective strong coupling constant to model hadronization effects.
hep-phUniverse(2022)·3 citations
10*
Improved description of e^+e^- \to p\bar{p}{\pi}^0 cross section line shape and more stringent constraints on {\psi}(3770) and {\psi}(4230) \to p\bar{p}{\pi}^0
Ya-Qian Wang🇨🇳 · Chang-Zheng Yuan🇨🇳
By using the cross sections of e^+e^- \to p\bar{p}{\pi}^0 measured at the center-of-mass energies from 3.65 to 4.60 GeV, we find that the line shape well agrees with pure continuum production parametrized by a power law function and the significance of both {\psi}(3770) and {\psi}(4230) \to p\bar{p}{\pi}^0 is less than 0.4{\sigma}. We set more stringent constraints on the charmless decays of the charmonium state, {\psi}(3770), and the charmoniumlike state, {\psi}(4230), to p\bar{p}{\pi}^0 than in previous measurements. The data are also used to estimate the cross sections of p\bar{p} \to {\pi}^0{\psi}(3770) and p\bar{p} \to {\pi}^0{\psi}(4230) that are essential for planning the data taking of the PANDA experiment.
hep-phhep-exPRD(2022)·1 citation
11*
Distinguishing nonstandard scalar and fermionic charged particles at future $e^{+} e^{-}$ collider
Anjan Kumar Barik🇮🇳 · Rafiqul Rahaman🇮🇳 · Santosh Kumar Rai🇮🇳
We investigate the possibility to identify the nature of spin of exotic charged particles at the future $e^{+} e^{-}$ collider in $l^{\pm} + 2 j + M E T$ final state choosing IDM and MSSM as examples for the new physics models with scalar and fermionic exotic charged particles, respectively. We choose four benchmarks for the mass parameters for a significant deviation from the SM $W^{+} W^{-}$ background. We find that the $cos θ$ of $W$ boson constructed from $j j$ pair and lepton have the potential to identify the MSSM signal compared to the IDM signal in longitudinally polarized initial beams. A more robust comparison is seen in the shape of the azimuthal angle of the $W$ boson and charged lepton, which can identify the IDM signal further if the beams are transversely polarized.
hep-phhep-exhep-thPRD(2023)·2 citations
12*
VISH $ν$ : a unified solution to five SM shortcomings with a protected electroweak scale
Alexei H. Sopov🇦🇺 · Raymond R. Volkas🇦🇺
We propose a Standard Model extension, coined VISH $ν$ (Variant-axIon Seesaw Higgs $ν$ -trino), that is an $N_{DW} = 1$ variation of its predecessor, the $ν$ DFSZ model. In accounting for the origin of neutrino masses, dark matter and the baryon asymmetry of the universe, VISH $ν$ inherits the explanatory power of $ν$ DFSZ while, of course, resolving the strong $C P$ problem. In both models, the electroweak scale is naturally protected from a high seesaw scale that is identified with the Peccei-Quinn (PQ) spontaneous symmetry breaking scale. Through a flavour variant coupling structure, VISH $ν$ evades a domain wall problem, extending the cosmological reach of the $ν$ DFSZ to include a viable period of inflation. The primary focus of this paper is on the inflationary dynamics of VISH $ν$ and their naturalness in the sense of radiative stability. We find that non-minimal gravitational couplings, generically developed by the VISH $ν$ scalar fields, naturally support a viable inflaton field which typically has both a PQ scalar and Higgs component. An axion mass window [ $40 μ eV, \sim 2 meV$ ] accessible to forthcoming searches, results for the case where PQ symmetry is restored during the (p)reheating phase.
hep-phastro-ph.COhep-thPhys.Dark Univ.(2023)·28 citations
13*
$B$ -meson decay into a proton and dark antibaryon from QCD light-cone sum rules
Alexander Khodjamirian🇩🇪 · Marcel Wald🇩🇪
The recently developed $B$ -Mesogenesis scenario predicts decays of $B$ mesons into a baryon and hypothetical dark antibaryon $Ψ$ . We suggest a method to calculate the amplitude of the simplest exclusive decay mode $B^{+} \to p Ψ$ . Considering two models of $B$ -Mesogenesis, we obtain the $B \to p$ hadronic matrix elements by applying QCD light-cone sum rules with the proton light-cone distribution amplitudes. We estimate the $B^{+} \to p Ψ$ decay width as a function of the mass and effective coupling of the dark antibaryon.
hep-phPLB(2022)·20 citations
14*
Proceedings of the Low- $x$ 2021 International Workshop
L. Alcerro · G. K. Krintiras · C. Royon · Michael G. Albrow · Thomas Boettcher · Stanley J. Brodsky · Francesco Giovanni Celiberto · Deniz Sunar Cerci · Salim Cerci · G. Chachamis · Dimitri Colferai · Weisong Duan and 15 other authors
The purpose of the Low- $x$ Workshop series is to stimulate discussions between experimentalists and theorists in diffractive hadronic physics, QCD dynamics at low $x$ , parton saturation, and exciting problems in QCD at HERA, Tevatron, LHC, RHIC, and the future EIC. The central topics of the workshop, summarized in the current Proceedings, were: Diffraction in ep and e-ion collisions (including EIC physics); Diffraction and photon-exchange in hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions; Spin Physics; Low- $x$ PDFs, forward physics, and hadronic final states. This Workshop has been the XXVIII edition in the series of the workshop.
hep-phhep-ex1 citation
15*
Probing Neutral Triple Gauge Couplings at the LHC and Future Hadron Colliders
John Ellis🇬🇧 · Hong-Jian He🇨🇳 · Rui-Qing Xiao🇬🇧
We study probes of neutral triple gauge couplings (nTGCs) at the LHC and the proposed 100TeV $pp$ colliders, and compare their sensitivity reaches with those of the proposed $e^{+} e^{-}$ colliders. The nTGCs provide a unique window to the new physics beyond the Standard Model (SM) because they can arise from SM effective field theory (SMEFT) operators that respect the full electroweak gauge group $S U (2)_{L} \otimes U (1)_{Y}$ of the SM only at the level of dimension-8 or higher. We derive the neutral triple gauge vertices (nTGVs) generated by these dimension-8 operators in the broken phase and map them onto a newly generalized form factor formulation, which takes into account only the residual U(1) $_{em}$ gauge symmetry. Using this mapping, we derive new relations between the form factors that guarantee a truly consistent form factor formulation of the nTGVs and remove large unphysical energy-dependent terms. We then analyze the sensitivity reaches of the LHC and future 100TeV hadron colliders for probing the nTGCs via both the dimension-8 nTGC operators and the corresponding nTGC form factors in the reactions $pp (q q ˉ) \to Z γ$ with $Z \to ℓ^{+} ℓ^{-}, ν ν ˉ$ . We compare their sensitivities with the existing LHC measurements of nTGCs and with those of the high-energy $e^{+} e^{-}$ colliders. In general, we find that the prospective LHC sensitivities are comparable to those of an $e^{+} e^{-}$ collider with center-of-mass energy $\leq 1$ TeV, whereas an $e^{+} e^{-}$ collider with center-of-mass energy $(3 - 5)$ TeV would have greater sensitivities, and a 100TeV $pp$ collider could provide the most sensitive probes of the nTGCs.
hep-phhep-exPRD(2023)·49 citations
16*
Unique Probe of Neutrino Electromagnetic Moments with Radiative Pair Emission
Shao-Feng Ge🇨🇳 · Pedro Pasquini🇨🇳
The neutrino magnetic and electric moments are zero at tree level but can arise in radiative corrections. Any deviation from the Standard Model prediction would provide another indication of neutrino-related new physics in addition to the neutrino oscillation and masses. Especially, Dirac and Majorana neutrinos have quite different structures in their electromagnetic moments. Nevertheless, the recoil measurements and astrophysical stellar cooling can only constrain combinations of neutrino magnetic and electric moments with the limitation of not seeing their detailed structures. We propose using the atomic radiative emission of neutrino pair to serve as a unique probe of the neutrino electromagnetic moments with the advantage of not just separating the magnetic and electric moments but also identifying their individual elements. Both searching strategy and projected sensitivities are illustrated in this letter.
hep-phhep-exPLB(2023)·12 citations
17*
Collider Signatures of a Scalar Leptoquark and Vector-like Lepton in Light of Muon Anomaly
Nivedita Ghosh🇮🇳 · Santosh Kumar Rai🇮🇳 · Tousik Samui🇮🇳
Despite the immense success of the Standard Model, the hunt for physics beyond the Standard Model has continued. Extension of the SM gauge group or the particle content of the SM remains a viable solution to many observed anomalies, such as the anomalous magnetic moment of muon, flavor violation, dark matter, etc. In this work, we consider a BSM model which includes a leptoquark, a vector-like lepton, and a real scalar singlet. The model accounts for a dark matter candidate through a $Z_{2}$ symmetry in addition to predicting the muon $(g - 2)$ in agreement with the experimental measurement. We also show that the experimental measurements of the lepton flavor violation are satisfied in a wide range of parameter space. The viable parameter space of the model is used to study the collider signatures arising from the pair production of the leptoquark in the $2 μ + 2 b + M E T$ channel at the 14 TeV LHC run.
hep-phPRD(2023)·15 citations
18*
Inclusive and semi-inclusive production of spin-3/2 hadrons in $e^{+} e^{-}$ annihilation
Jing Zhao🇨🇳 · Zhe Zhang🇨🇳 · Zuo-tang Liang🇨🇳 · Tianbo Liu🇨🇳 · Ya-jin Zhou🇨🇳
We investigate the inclusive and semi-inclusive productions of spin-3/2 hadrons, such as $Ω$ , in unpolarized $e^{+} e^{-}$ annihilation. The general differential cross sections are expressed in terms of structure functions in accordance to the polarization of the hadron and the azimuthal modulations. We derive a complete definition of quark transverse momentum dependent (TMD) fragmentation functions (FFs) to spin-3/2 hadrons for the first time from the decomposition of the quark-quark correlation matrix at leading twist, 14 of which are newly defined corresponding to rank-3 tensor polarized hadron. The collinear FFs are obtained from the $k_{T}$ -integrated correlation matrix, and only two TMD FFs with rank-3 tensor polarization have nonvanishing collinear counterparts. Then we perform a leading order calculation of the unpolarized differential cross sections. In the single-hadron inclusive production, only two structure functions are found nonzero and none of the rank-3 tensor polarized FFs contributes. For the nearly back-to-back two-hadron production, half of the 48 structure functions are found nonzero even if the spin of the second hadron is not analyzed, and ten of the rank-3 tensor polarized TMD FFs contribute. Therefore, one can study the rank-3 tensor polarized FFs via the production of a spin-3/2 hadron and an unpolarized hadron in unpolarized $e^{+} e^{-}$ collision experiments. These newly defined FFs can be further applied in semi-inclusive deep inelastic scattering processes for the study of nucleon structures.
hep-phPRD(2022)·15 citations
19*
The muon $g - 2$ and $W$ -mass anomalies explained and the electroweak vacuum stabilised by extending the minimal Type-II seesaw
Nabarun Chakrabarty🇮🇳
The recent precise measurement of the $W$ -mass by the CDF II collaboration is indicative of new physics beyond the Standard Model. On the other hand, a resolution of the longstanding muon $g - 2$ anomaly also calls for additional dynamics. In this work, we accommodate the two aforementioned anomalies in an extension of the minimal Type-II seesaw model. That is, the minimal Type-II model is augmented with an additional doubly charged scalar and vector leptons. While a chirality-flip of the vector leptons can predict the observed value of muon $g - 2$ , the value of the recently reported $W$ -mass can also be simultaneously achieved through the oblique parameters of the model. In addition, we further show that the parameter region allowing for the simultaneous resolution of the two anomalies complies with the neutrino mass data, lepton flavour violation and electroweak vacuum stability up to the Planck scale.
hep-phPRD(2023)·18 citations
20*
Weak radiative hyperon decays in covariant baryon chiral perturbation theory
Rui-Xiang Shi🇨🇳 · Shuang-Yi Li🇨🇳 · Jun-Xu Lu🇨🇳 · Li-Sheng Geng🇨🇳
Weak radiative hyperon decays, important to test the strong interaction and relevant in searches for beyond the standard model physics, have remained puzzling both experimentally and theoretically for a long time. The recently updated branching fraction and first measurement of the asymmetry parameter of $Λ \to nγ$ by the BESIII Collaboration further exacerbate the issue, as none of the existing predictions can describe the data. We show in this letter that the covariant baryon chiral perturbation theory, with constraints from the latest measurements of hyperon non-leptonic decays, can well describe the BESIII data. The predicted branching fraction and asymmetry parameter for $Ξ^{-} \to Σ^{-} γ$ are also in agreement with the experimental data. We note that a more precise measurement of the asymmetry parameter, which is related with that of $Σ^{+} \to p γ$ , is crucial to test Hara's theorem. We further predict the branching fraction and asymmetry parameter of $Σ^{0} \to nγ$ , whose future measurement can serve as a highly nontrivial check on our understanding of weak radiative hyperon decay and on the covariant baryon chiral perturbation theory.
hep-phhep-exhep-latSci.Bull.(2022)·20 citations
21*
Chiral Magnetic Effect out of equilibrium
Chitradip Banerjee🇮🇱 · Meir Lewkowicz🇮🇱 · M. A. Zubkov🇮🇱
We consider relativistic fermionic systems in lattice regularization out of equilibrium. The chiral magnetic conductivity $σ_{C M E}$ is calculated in spatially infinite system for the case when the chiral chemical potential depends on time while the system initially was in thermal equilibrium at small but nonzero temperature. We find that the frequency dependent $σ_{C M E} (ω)$ for any nonzero $ω$ both in the limits $ω ≪ T$ and $ω ≫ T$ is equal to its conventional value $1$ when the lattice model approaches continuum limit. Notice that $σ_{C M E} = 0$ for the case when the chiral chemical potential does not depend on time at all. We therefore confirm that the limit of vanishing $ω$ is not regular for the spatially infinite systems of massless fermions.
hep-phhep-latPRD(2022)·12 citations
22*
The hMSSM with a Light Gaugino/Higgsino Sector: Implications for Collider and Astroparticle Physics
Giorgio Arcadi🇮🇹 · Abdelhak Djouadi🇪🇪 · Hong-Jian He🇨🇳 · Jean-Loic Kneur🇫🇷 · Rui-Qing Xiao🇬🇧
The hMSSM is a special parameterization of the minimal supersymmetric extension of the Standard Model (MSSM) in which the mass of the lightest Higgs boson is automatically set to the LHC measured value, $M_{h} = 125$ \,GeV, by adjusting the supersymmetric particle spectrum such that it provides the required amount of radiative corrections to the Higgs boson masses.\ The latter spectrum was in general assumed to be very heavy, as indicated by the present exclusion limits of the LHC, not to affect the phenomenology of the Higgs sector.\ In this work, we investigate the impact on the hMSSM by a light gaugino and higgsino sector, that is allowed by the present LHC data.\ In particular, we discuss the radiative corrections due to charginos and neutralinos to the Higgs boson masses and couplings and show that an hMSSM can still be realized in this context.\ We first describe how this scenario is implemented in the package SuSpect that generates the MSSM Higgs and supersymmetric spectra.\ We then analyze the possible impact of Higgs boson decays into these new states, as well as the reverse cascade channels with Higgs bosons in the final states, for the constraints on the MSSM Higgs sector at the LHC.\ We further explore the cosmological constraints on the hMSSM with a light gaugino--higgsino spectrum.\ We analyze the relic abundance of the lightest neutralino as a candidate of the dark matter in the Universe and the constraints on its mass and couplings by the present and future astroparticle physics experiments.
hep-phJHEP(2023)·8 citations
23*
CDF-II W boson mass in the Dirac Scotogenic model
Salvador Centelles Chuliá🇩🇪 · Rahul Srivastava🇮🇳 · Sushant Yadav🇮🇳
The Dirac scotogenic model provides an elegant mechanism which explains small Dirac neutrino masses and neutrino mixing, with a single symmetry simultaneously protecting the ``Diracness'' of the neutrinos and the stability of the dark matter candidate. Here we explore the phenomenological implications of the recent CDF-II measurement of the $W$ boson mass in the Dirac scotogenic framework. We show that, in the scenario where the dark matter is mainly a $S U (2)_{L}$ scalar doublet, it cannot concurrently satisfy: (a) the dark matter relic density (b) the $m_{W}$ anomaly and (c) the direct detection constraints. However, unlike the Majorana scotogenic model, the Dirac version also has a ``dark sector'' $S U (2)_{L}$ singlet scalar. We show that if the singlet scalar is the lightest dark sector particle i.e. the dark matter, then all neutrino physics and dark matter constraints along with the constraints from oblique $S$ , $T$ and $U$ parameters can be concurrently satisfied for $W$ boson mass in CDF-II mass range.
hep-phhep-exMod.Phys.Lett.A(2023)·23 citations
24*
Discovery potential for split supersymmetry with thermal dark matter
Raymond T. Co🇺🇸 · Aaron Pierce🇺🇸 · Benjamin Sheff🇺🇸 · James D. Wells🇺🇸
Supersymmetric extensions of the Standard Model with scalar superpartners above 10 TeV are well motivated since the Higgs boson mass can be explained by quantum corrections while maintaining gauge coupling unification. If supersymmetry breaking is transmitted to gauginos via anomaly mediation, the gaugino masses are loop suppressed compared to scalar masses, and the lightest supersymmetric particle is the Higgsino or wino, which can be the dark matter. In this setup, we identify the regions of parameter space that reproduce the observed Higgs boson mass and the thermal abundance of dark matter. We analyze the effects of complex phases in the gaugino mass parameters on the electron electric dipole moment (EDM) and the dark matter scattering cross section. We find that, for scalar masses up to 10 PeV and any size of the complex phases, the model with Higgsino dark matter is within reach of planned experiments -- Advanced ACME via electron EDM and LUX-ZEPLIN via dark matter direct detection -- with complementary discovery potentials, and the model with wino dark matter is within reach of future electron EDM experiments.
hep-phPRD(2022)·7 citations
25*
Double-Real-Virtual and Double-Virtual-Real Corrections to the Three-Loop Thrust Soft Function
Wen Chen🇨🇳 · Feng Feng🇨🇳 · Yu Jia🇨🇳 · Xiaohui Liu🇨🇳
We compute the $O (α_{s}^{3})$ double-real-virtual (RRV) and double-virtual-real (VVR) soft contributions to the thrust/zero-jettiness event shape. The result clears up one of the most stubborn obstacles toward the complete $O (α_{s}^{3})$ thrust soft function. The results presented here serve as the key input to realize the next-to-next-to-next-to-leading logarithmic prime (N $^{3}$ LL') % and even the next-to-next-to-next-to-next-to-leading logarithmic (N $^{4}$ LL) resummation of the thrust event shape. The obtained results also constitute the important ingredients of the $N$ -jettiness-subtraction scheme at next-to-next-to-next-to-leading order (N $^{3}$ LO).
hep-phJHEP(2022)·19 citations
26*
Experimental Searches For Heavy Neutral Leptons
Sophie Middleton🇺🇸
The highly successful Standard Model is not complete. It does not explain the baryonic asymmetry in the Universe, the existence of dark matter or the non-zero masses of the neutrinos. Extensions of the Standard Model that propose the existence of additional Heavy Neutral Leptons (HNLs) are well-motivated and can explain several of these phenomena. In addition, light sterile neutrinos of $O (eV / c^{2})$ can explain experimentally observed oscillation anomalies. The Neutrino Minimal Standard Model proposes HNLs with masses $O (keV / c^{2} - GeV / c^{2})$ , while more exotic models predict very large masses, up to the GUT scale. Due to the multitude of models which hypothesize HNLs, the mass range to be explored by experiments is large. Experimental searches for HNLs can be conducted at existing neutrino, beam dump and collider-based experiments, and, depending on the signature, can constrain mixing between additional neutrinos and any of the three active neutrinos.
↳ hep-exhep-ph1 citation
27*
Complete experiment problem for photoproduction of two pseudoscalar mesons on a nucleon in a truncated partial-wave analysis
A. Fix🇷🇺 · I. Dementjev🇷🇺
It is shown that within a truncated partial wave analysis for photoproduction of two pseudoscalar mesons, it is possible to halve the number of independent partial amplitudes by taking into account parity conservation. In addition, within the framework of the proposed formalism, one can rather easily resolve the double discrete ambiguity arising from the symmetry under complex conjugation of the helicity amplitudes. This leads to essential simplifications of the complete experiment problem, at least as far as mathematical aspects are concerned.
↳ nucl-thhep-phPRC(2022)·1 citation
28*
Thermal and nonthermal emission from a peculiar long-duration GRB 211211A
Xue-Zhao Chang · Hou-Jun Lü🇨🇳 · Xing Yang🇨🇳 · Jia-Ming Chen🇨🇳 · En-Wei Liang🇨🇳
Long-duration GRB 211211A that lacks a supernova emission even down to very stringent limits at such a low redshift $z = 0.076$ and is associated with kilonova emission, suggests that its physical origin is from a binary compact star merger. By reanalyzing its data observed with the Gamma-Ray Burst Monitor on board the Fermi mission, we find that both time-integrated and time-resolved spectra can be fitted well by using a 2SBPL plus blackbody (2SBPL+BB) model in the prompt emission. The bulk Lorentz factors ( $Γ_{ph}$ ) of the outflow can be inferred by invoking the observed thermal emission at the photosphere radius within a pure fireball model, and we find out that the temporal evolution of $Γ_{ph}$ seems to be tracking with the light curve. The derived values of $Γ_{ph}$ are also consistent with the $Γ_{ph}$ - $L_{γ, iso}$ / $E_{γ, iso}$ correlations that had been found in other bursts. Moreover, we also calculate the magnetization factor $σ_{0}$ in the central engine and $σ_{ph}$ at the photosphere radius within the framework of a hybrid jet model, and find that the values of both $1 + σ_{0}$ and $1 + σ_{ph}$ are larger than 1 for different time slices. It suggests that at least the Poynting-flux component is indeed existent in the outflow. If this is the case, one possible physical interpretation of thermal and nonthermal emissions in GRB 211211A is from the contributions of both $ν ν ˉ$ annihilation and the Blandford-Znajek mechanisms in the relativistic jet when a stellar mass black hole resides in the central engine.
↳ astro-ph.HEhep-phApJ(2023)·28 citations
29*
Charmonium dissociation at high baryon chemical potential
Bo Tong🇨🇳 · Baoyi Chen🇨🇳
We study the charmonium dissociation in the hot medium with finite baryon chemical potential $μ_{B}$ . Charmonium bound states are dissociated in the medium by the color screening effect and the random scatterings with thermal partons, which are included in the real and imaginary parts of the potential respectively. $J / ψ$ fraction in the $c c ˉ$ pair defined to be the quantum overlap between the wave package and the wave function of $J / ψ$ eigenstate decreases with time due to the complex potentials. When $μ_{B}$ is large compared with the medium temperature, the Deybe mass is increased evidently. We consider $μ_{B}$ -dependent Deybe mass in both real and imaginary parts of the potential to calculate the $J / ψ$ survival probability in the static medium and the Bjorken medium. $J / ψ$ survival probability is reduced evidently by the $μ_{B}$ effect at low temperatures available in the medium produced in Beam Energy Scan experiments, while this effect becomes not apparent at high temperatures.
↳ nucl-thhep-phPRC(2022)·2 citations
30*
Putting Flat $Λ$ CDM In The (Redshift) Bin
Eoin Ó Colgáin🇰🇷 · M. M. Sheikh-Jabbari🇮🇷 · Rance Solomon🇺🇸 · Maria G. Dainotti🇯🇵 · Dejan Stojkovic🇺🇸
Flat $Λ$ CDM cosmology is specified by two constant fitting parameters at the background level in the late Universe, the Hubble constant $H_{0}$ and matter density (today) $Ω_{m}$ . Mathematically, $H_{0}$ and $Ω_{m}$ are either integration constants arising from solving ordinary differential equations or are directly related to integration constants. Seen in this context, if fits of the $Λ$ CDM model to cosmological probes at different redshifts lead to different $(H_{0}, Ω_{m})$ parameters, this is a mismatch between mathematics and observation. Here, in mock observational Hubble data (OHD) (geometric probes of expansion history) we demonstrate evolution in distributions of best fit parameters with effective redshift. As a result, considerably different $(H_{0}, Ω_{m})$ best fits from Planck- $Λ$ CDM cannot be precluded in high redshift bins. We explore if OHD, Type Ia supernovae and standardisable quasar samples exhibit redshift evolution of best fit $Λ$ CDM parameters. In all samples, we confirm a decreasing $H_{0}$ and increasing $Ω_{m}$ trend with increasing bin redshift. Through comparison with mocks, we confirm that similar behaviour can arise randomly within the flat $Λ$ CDM model with probabilities as low as $p = 0.0021$ ( $3.1 σ$ ). We present complementary profile distribution analysis confirming the shifts in cosmological parameters in high redshift bins. In particular, we identify a redshift range where Planck $(H_{0}, Ω_{m})$ values are disfavoured at $99.6%$ ( $2.9 σ$ ) confidence level in a combination of OHD and supernovae data.
↳ astro-ph.COgr-qchep-phhep-thPhys.Dark Univ.(2024)·125 citations
31*
Tensor polarization and the dissipative damping of vector meson in QCD Medium
Feng Li🇨🇳 · Shuai Y. F. Liu🇨🇳
Unexpectedly large and puzzling spin alignment, and thus tensor polarization, of vector mesons has been observed in heavy-ion collisions. Given that tensor polarization represents a fluctuation of spin, we derive, for the first time, a fluctuation-dissipation relation for tensor polarization, where the polarization is proportional to first-order hydrodynamic gradients (e.g., the shear-stress tensor), with dissipative coefficients depending on the particle's damping properties, as characterized by its spectral function. Employing relativistic hydrodynamics at finite density, we find that dissipative contributions can generate substantial spin alignment. We provide illustrative examples (by tuning one coefficients $α_{sh}$ ) that generate a beam energy, $p_{T}$ , and centrality dependence of spin alignment resembling those observed in experiments, offering insights into these puzzling phenomena and demonstrating its potential as a ``spectrometer" for in-medium vector mesons.
↳ nucl-thhep-ph45 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.