Mon·Jan 8, 2024Monday·January 8, 2024

1. 01*

   GeV-scale dark matter with $p$-wave Breit-Wigner enhanced annihilation

   Genevieve Bélanger🇫🇷 · Sreemanti Chakraborti🇬🇧 · Yoann Génolini🇫🇷 · Pierre Salati🇫🇷

   We consider a light scalar dark matter candidate with mass in the GeV range whose $p$-wave annihilation is enhanced through a Breit-Wigner resonance. The annihilation actually proceeds in the $s$-channel via a dark photon mediator whose mass is nearly equal to the masses of the incoming particles. We compute the temperature at which kinetic decoupling between dark matter and the primordial plasma occurs and show that including the effect of kinetic decoupling can reduce the dark matter relic density by orders of magnitude. For typical scalar masses ranging from 200 MeV to 5 GeV, we determine the range of values allowed for the dark photon couplings to the scalar and to the standard model particles after requiring the relic density to be in agreement with the value extracted from cosmological observations. We then show that $\mu$ and $y$-distortions of the CMB spectrum and X-ray data from XMM-Newton strongly constrain the model and rule out the region where the dark matter annihilation cross-section is strongly enhanced at small dispersion velocities. Constraints from direct detection searches and from accelerator searches for dark photons offer complementary probes of the model.

   hep-phPRD(2024)·11 citations
2. 02*

   Recent Developments in Quarkonium as an Open Quantum System in Quark-Gluon Plasma

   Bruno Scheihing Hitschfeld🇺🇸 · Xiaojun Yao🇺🇸

   We review recent progress in understanding quarkonium dynamics inside the quark-gluon plasma as an open quantum system with a focus on the definition and nonperturbative calculations of relevant transport coefficients and generalized gluon distributions.

   hep-phnucl-thquant-ph3 citations
3. 03*

   Kinetic theory formulation of the $P$- and $CP$-odd terms in the photon self-energy in a medium

   José F. Nieves🇺🇸 · John D. Verges🇺🇸

   In an optically active medium, such as a plasma that contains a neutrino background, the left-handed and right-handed polarization photon modes acquire different dispersion relations. We study the propagation of photons in such a medium, which is otherwise isotropic, within the framework of the covariant collissionless Boltzmann equation incorporating a term that parametrizes the optical activity. Using the linear response approximation, we obtain the formulas for the components of the photon polarization tensor, expressed in terms of integrals over the momentum distribution function of the background particles. The main result here is the formula for the P- and CP-breaking component of the photon polarization tensor in terms of the parameter involved in the new term we consider in the Boltzmann equation to describe the effects of optical activity. We discuss the results for some particular cases, such as long-wavelength and non-relativistic limits, for illustrate purposes. We also discuss the generalizations of the P- and CP-breaking term we included in the Boltzmann equation. In particular we consider the application to a plasma with a neutrino background and establish contact with calculations of the photon self-energy in those systems in the framework of Thermal Field Theory.

   hep-phPRD(2024)·0 citations
4. 04*

   Probing Inert Triplet Model at a multi-TeV muon collider via vector boson fusion with forward muon tagging

   Priyotosh Bandyopadhyay🇮🇳 · Snehashis Parashar🇮🇳 · Chandrima Sen🇮🇳 · Jeonghyeon Song🇰🇷

   This study investigates the potential of a multi-TeV Muon Collider (MuC) for probing the Inert Triplet Model (ITM), which introduces a triplet scalar field with hypercharge $Y=0$ to the Standard Model. The ITM stands out as a compelling Beyond the Standard Model scenario, featuring a neutral triplet $T^0$ and charged triplets $T^{\pm }$. Notably, $T^0$ is posited as a dark matter (DM) candidate, being odd under a $Z_2$ symmetry. Rigorous evaluations against theoretical, collider, and DM experimental constraints corner the triplet scalar mass to a narrow TeV-scale region, within which three benchmark points are identified, with $T^{\pm }$ masses of 1.21 TeV, 1.68 TeV, and 3.86 TeV, for the collider study. The ITM's unique $TTVV$ four-point vertex, differing from fermionic DM models, facilitates efficient pair production through Vector Boson Fusion (VBF). This characteristic positions the MuC as an ideal platform for exploring the ITM, particularly due to the enhanced VBF cross-sections at high collision energies. To address the challenge of the soft decay products of $T^{\pm }$ resulting from the narrow mass gap between $T^{\pm }$ and $T^0$, we propose using Disappearing Charged Tracks (DCTs) from $T^{\pm }$ and Forward muons as key signatures. We provide event counts for these signatures at MuC energies of 6 TeV and 10 TeV, with respective luminosities of 4 ab${}^{-1}$ and 10 ab${}^{-1}$. Despite the challenge of beam-induced backgrounds contaminating the signal, we demonstrate that our proposed final states enable the MuC to achieve a $5\sigma$ discovery for the identified benchmark points, particularly highlighting the effectiveness of the final state with one DCT and one Forward muon.

   hep-phhep-exJHEP(2024)·22 citations
5. 05*

   Simultaneous Determination of Fragmentation Functions and Test on Momentum Sum Rule

   Jun Gao🇺🇸 · ChongYang Liu🇨🇳 · XiaoMin Shen🇨🇳 · Hongxi Xing🇨🇳 · Yuxiang Zhao🇨🇳

   We perform a simultaneous global analysis of hadron fragmentation functions (FFs) to various charged hadrons at next-to-leading order in QCD. The world data set includes results from electron-positron single-inclusive annihilation, semi-inclusive deep inelastic scattering, as well as proton-proton collisions including jet fragmentation measurements which lead to strong constraints on the gluon fragmentations. By carefully selecting hadron kinematics to ensure the validity of QCD factorization and the convergence of perturbative calculations, we achieve a satisfying best fit with ${\chi }^2/$d.o.f.$=0.90$, in the simultaneous extraction of FFs for light charged hadrons (${\pi }^{\pm }$, $K^{\pm }$ and $p/\bar{p}$). The total momentum of $u$, $d$ quarks and gluon carried by light charged hadrons have been determined precisely. That urges future precision measurements on fragmentation to neutral hadrons, which are crucial for the test of fundamental sum rules in QCD fragmentation.

   hep-phhep-exnucl-thPRL(2024)·41 citations
6. 06*

   Doubly-Charged $T_{cc}^{++}$ States in the Dynamical Diquark Model

   Halil Mutuk🇹🇷

   One of the celebrated tools in explaining the Hydrogen atom is Born-Oppenheimer approximation. The resemblance of $QQ\bar{q}\bar{q}$ tetraquarks to Hydrogen atom within Quantum chromodynamics (QCD) implies usage of Born-Oppenheimer approximation for these multiquark states. In this work, we use dynamical diquark model to calculate mass spectra and sizes of doubly charmed and charged tetraquark states denoted as $T_{cc}^{++}$. Our results for mass spectra indicate some bound state candidates with respect to corresponding two-meson thresholds. Calculation of expectation values of $\sqrt{⟨r^2⟩}$ reflects that doubly charmed and charged tetraquark states are compact.

   hep-phhep-exhep-latPRD(2024)·16 citations
7. 07*

   Flavour anomalies, correlations, hadronic uncertainties, and all that

   Pietro Colangelo🇮🇹 · Fulvia De Fazio🇮🇹 · Francesco Loparco🇮🇹 · Nicola Losacco🇮🇹

   We present a short overview of the so-called flavour anomalies, discussing their significance and the connections with QCD issues discussed at the HADRON 2023 conference.

   hep-phNuovo Cim.C(2024)·5 citations
8. 08*

   Hunting for Hypercharge Anapole Dark Matter in All Spin Scenarios

   Seong Youl Choi🇰🇷 · Jaehoon Jeong🇰🇷 · Dong Woo Kang🇰🇷 · Seodong Shin🇰🇷

   We conduct a combined analysis to investigate dark matter (DM) with hypercharge anapole moments, focusing on scenarios where Majorana DM particles with spin 1/2, 1, 3/2, and 2 interact exclusively with Standard Model particles through U(1)${}_Y$ hypercharge anapole terms for the first time. For completeness, we construct general effective U(1) gauge-invariant three-point vertices. These enable the generation of hypercharge gauge-invariant interaction vertices for both a virtual photon $\gamma$ and a virtual $Z$ boson with two identical massive Majorana particles of any non-zero spin $s$, after the spontaneous breaking of electroweak gauge symmetry. For complementarity, we adopt effective operators tailored to each dark matter spin allowing crossing symmetry. We calculate the relic abundance, analyze current constraints and future sensitivities from dark matter direct detection and collider experiments, and apply the conceptual naive perturbativity bound. Our estimations based on a generalized vertex calculation demonstrate that the scenario with a higher-spin DM is more stringently constrained than a lower-spin DM, primarily due to the reduced annihilation cross-section and/or the enhanced rate of LHC mono-jet events. As a remarkable outcome, the spin-2 anapole DM scenario is almost entirely excluded, while the high-luminosity LHC exhibits high sensitivities in probing spin-1 and 3/2 scenarios, except for a tiny parameter range of DM mass around 1 TeV. A significant portion of the remaining parameter space in the spin-1/2 DM scenario can be explored through upcoming Xenon experiments, with more than 20 ton-year exposure equivalent to approximately 5 years of running the XENONnT experiment.

   hep-phPRD(2024)·6 citations
9. 09*

   Chiral condensate and the equation of state at nonzero baryon density from the hadron resonance gas model with a repulsive mean field

   Deeptak Biswas🇮🇳 · Peter Petreczky🇺🇸 · Sayantan Sharma🇮🇳

   We study the QCD equation of state and the chiral condensate using the hadron resonance gas model with repulsive mean-field interactions. We find that the repulsive interactions improve the agreement with the lattice results on the derivatives of the pressure with respect to the baryon chemical potential up to eighth order. From the temperature dependence of the chiral condensate we estimate the crossover temperature as a function of baryon chemical potential, $T_{pc}({\mu }_B)$. We find that the chiral crossover line starts to deviate significantly from the chemical freeze-out line already for ${\mu }_B>400$ MeV. Furthermore, we find that the chiral pseudocritical line can be parametrized as $T_{pc}({\mu }_B)/T_{pc}(0)=1-{\kappa }_2({\mu }_B/T_{pc}(0){)}^2-{\kappa }_4({\mu }_B/T_{pc}(0){)}^4$ with ${\kappa }_2=0.0150(2)$ and ${\kappa }_4=3.1(6)\times 10^{-5}$, which are in agreement with lattice QCD results for small values of ${\mu }_B$. For the first time we find a tiny but non-zero value of ${\kappa }_4$ in our study.

   hep-phhep-latnucl-thPRC(2024)·10 citations
10. 10*

    Violation of LGtI inequalities in the light of NO$\nu$A and T2K anomaly

    Lekhashri Konwar🇮🇳 · Juhi Vardani🇮🇳 · Bhavna Yadav🇮🇳

    The recent anomaly observed in NO$\nu$A and T2K experiments in standard three-flavor neutrino oscillation could potentially signal physics extending beyond the standard model (SM). For the NSI parameters that can accommodate this anomaly, we explore the violation of Leggett-Garg type inequalities (LGtI) within the context of three-flavor neutrino oscillations. Our analysis focuses on LGtI violations in scenarios involving complex NSI with ${ϵ}_{e\mu }$ or ${ϵ}_{e\tau }$ coupling in long baseline accelerator experiments for normal and inverted mass ordering.LGtI violation is significantly enhanced in normal ordering (NO) for ${ϵ}_{e\tau }$ scenario for T2K, NO$\nu$A, and DUNE experiment set-up. We find that for inverted ordering (IO), in the DUNE experimental set-up above $8.5$ GeV, the LGtI violation can be an indication of ${ϵ}_{e\tau }$ new physics scenario.

    hep-phquant-phEPJC(2024)·12 citations
11. 11*

    Charged-current non-standard neutrino interactions at Daya Bay

    Daya Bay collaboration: F. P. An🇨🇳 · W. D. Bai🇨🇳 · A. B. Balantekin🇺🇸 · M. Bishai🇺🇸 · S. Blyth🇨🇳 · G. F. Cao🇨🇳 · J. Cao🇨🇳 · J. F. Chang🇨🇳 · Y. Chang🇹🇼 · H. S. Chen🇨🇳 · H. Y. Chen🇨🇳 · S. M. Chen🇨🇳 and 189 other authors

    The full data set of the Daya Bay reactor neutrino experiment is used to probe the effect of the charged current non-standard interactions (CC-NSI) on neutrino oscillation experiments. Two different approaches are applied and constraints on the corresponding CC-NSI parameters are obtained with the neutrino flux taken from the Huber-Mueller model with a $5\%$ uncertainty. For the quantum mechanics-based approach (QM-NSI), the constraints on the CC-NSI parameters ${ϵ}_{e\alpha }$ and ${ϵ}_{e\alpha }^s$ are extracted with and without the assumption that the effects of the new physics are the same in the production and detection processes, respectively. The approach based on the weak effective field theory (WEFT-NSI) deals with four types of CC-NSI represented by the parameters $[{\epsilon }_X{]}_{e\alpha }$. For both approaches, the results for the CC-NSI parameters are shown for cases with various fixed values of the CC-NSI and the Dirac CP-violating phases, and when they are allowed to vary freely. We find that constraints on the QM-NSI parameters ${ϵ}_{e\alpha }$ and ${ϵ}_{e\alpha }^s$ from the Daya Bay experiment alone can reach the order $\mathcal{O}(0.01)$ for the former and $\mathcal{O}(0.1)$ for the latter, while for WEFT-NSI parameters $[{\epsilon }_X{]}_{e\alpha }$, we obtain $\mathcal{O}(0.1)$ for both cases.

    hep-phhep-exJHEP(2024)·3 citations
12. 12*

    Phantom Fluid Cosmology -or- Ghosts for Gordon

    James M. Cline🇨🇦

    The quanta of phantom dark energy models are negative energy particles, whose maximum magnitude of energy $|E|$ must be less than a cutoff $\Lambda \lesssim 20$MeV. They are produced by spontaneous decay of the vacuum into phantoms plus normal particles. I review general cosmological constraints that have been derived from the effects of such phantom fluid production, and a possible application: the generation of boosted dark matter or radiation that could be directly detected. Recent excess events from the DAMIC experiment can be well-fit by such processes.

    hep-phastro-ph.COhep-th5 citations
13. 13*

    Energy Calculation of Pentaquarks Using Thomas Fermi Quark Model: A Theoretical Study

    Bipin Aryal · Suman Baral · Gopi Chandra Kaphle

    The possible existence of a family of $uudc\overline{c}$ pentaquark system was explored through the application of Thomas Fermi Quark Model on the system. Considering a pocket of pentaquark contains $5$ quarks, the density functions, and energies of $10$ different pockets of pentaquarks were studied. Out of these $10$ different pockets, a single pocket of pentaquark was found to be more stable as its total energy was lowest compared to others. The kinetic, potential, and volume energies of all pockets of pentaquarks were calculated and the nature of the plots was investigated. The plots displayed an increasing trend for all energies except for kinetic energy, which exhibited a decreasing pattern.

    hep-phhep-lat1 citation
14. 14*

    N${}^3$LO Power Corrections for $0$-jettiness Subtractions With Fiducial Cuts

    Gherardo Vita🇨🇭

    We compute the leading logarithmic power corrections at next-to-next-to-next-to-leading order for $0$-jettiness subtractions for color singlet production. We discuss how to disentangle these power corrections from those arising from the presence of fiducial and isolation cuts by using Projection-to-Born improved slicing. We present the results for Drell-Yan and Higgs production in gluon fusion differential in both the invariant mass and rapidity of the color singlet. Our results include all the channels contributing at leading logarithmic order for these processes, including the off-diagonal channels that receive contributions from soft quark emission. We study the numerical impact of the power corrections for Drell-Yan and Higgs production and find it to become negligible compared to the size of the N${}^3$LO corrections only below ${\tau }_{\text{cut}}\sim 10^{-5}$. We estimate that in a fully differential calculation at N${}^3$LO combining the Projection-to-Born improved slicing method and our results for the leading logarithmic power corrections may allow for keeping the slicing uncertainties under control already with ${\tau }_{\text{cut}}\lesssim 10^{-3}$, marking a significant improvement in efficiency for these methods. These results constitute a crucial ingredient for fully differential N${}^3$LO calculations based on the $N$-jettiness subtraction scheme.

    hep-phnucl-thJHEP(2024)·12 citations
15. 15*

    Loop Feynman integration on a quantum computer

    Jorge J. Martínez de Lejarza🇪🇸 · Leandro Cieri🇪🇸 · Michele Grossi🇨🇭 · Sofia Vallecorsa🇨🇭 · Germán Rodrigo🇪🇸

    This work investigates in detail the performance and advantages of a new quantum Monte Carlo integrator, dubbed Quantum Fourier Iterative Amplitude Estimation (QFIAE), to numerically evaluate for the first time loop Feynman integrals in a near-term quantum computer and a quantum simulator. In order to achieve a quadratic speedup, QFIAE introduces a Quantum Neural Network (QNN) that efficiently decomposes the multidimensional integrand into its Fourier series. For a one-loop tadpole Feynman diagram, we have successfully implemented the quantum algorithm on a real quantum computer and obtained a reasonable agreement with the analytical values. One-loop Feynman diagrams with more external legs have been analyzed in a quantum simulator. These results thoroughly illustrate how our quantum algorithm effectively estimates loop Feynman integrals and the method employed could also find applications in other fields such as finance, artificial intelligence, or other physical sciences.

    hep-phquant-phPRD(2024)·33 citations
16. 16*

    Dark Matter Candidates of a Very Low Mass

    Kathryn M. Zurek🇺🇸

    We review dark matter (DM) candidates of a very low mass, appearing in the window below the traditional weakly-interacting massive particle $m_{\chi }\lesssim 10$ GeV and extending down to $m_{\chi }\gtrsim 1$ meV, somewhat below the mass limit where DM becomes wavelike. Such candidates are motivated by hidden sectors such as Hidden Valleys, which feature hidden forces and rich dynamics, but have evaded traditional collider searches looking for New Physics because of their relatively weak coupling to the Standard Model. Such sectors can still be detected through dedicated low-energy colliders which, through their intense beams, can have sensitivity to smaller couplings, or through astrophysical observations of the evolution of DM halos and stellar structures which, through the Universe's epochs, can be sensitive to small DM interactions. We also consider mechanisms where the DM abundance is fixed through the interaction with the SM, which directly motivates the search for light DM in terrestrial experiments. The bulk of this review is dedicated to the new ideas that have been proposed for directly detecting such DM candidates of a low mass, through nuclear recoils, electronic excitations, or collective modes such as phonons and magnons. The rich tapestry of materials and modes in the Condensed Matter landscape is reviewed, along with specific prospects for detection.

    hep-phastro-ph.COAnn.Rev.Nucl.Part.Sci.(2024)·41 citations
17. 17*

    Thermal QCD phase transition with dynamical chiral fermions

    Z. Fodor🇩🇪 · A.Yu. Kotov🇩🇪 · K. Szabo🇩🇪

    We discuss properties of Quantum Chromodynamics at finite temperature obtained by means of lattice simulations with overlap fermions. This fermion discretization preserves chiral symmetry even at finite lattice spacing. We present details of the lattice formulation, first results for the chiral observables and discuss the behaviour of the system near the chiral thermal phase transition.

    ↳ hep-lathep-phhep-thPoS(2024)·4 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.