Mon·Apr 22, 2024Monday·April 22, 2024

1. 01*

   Improved Thermal Resummation for Multi-Field Potentials

   Henning Bahl🇩🇪 · Marcela Carena🇺🇸 · Aurora Ireland🇺🇸 · Carlos E.M. Wagner🇺🇸

   The resummation of large thermal corrections to the effective potential is mandatory for the accurate prediction of phase transitions. We discuss the accuracy of different prescriptions to perform this resummation at the one- and two-loop level and point out conceptual issues that appear when using a high-temperature expansion at the two-loop level. Moreover, we show how a particular prescription called partial dressing, which does not rely on a high-temperature expansion, consistently avoids these issues. We introduce a novel technique to apply this resummation method to the case of multiple mixing fields. Our approach significantly extends the range of applicability of the partial dressing prescription, making it suitable for phenomenological studies of beyond the Standard Model extensions of the Higgs sector.

   hep-phJHEP(2024)·19 citations
2. 02*

   Minimal complete tri-hypercharge theories of flavour

   Mario Fernández Navarro🇬🇧 · Stephen F. King🇬🇧 · Avelino Vicente🇪🇸

   The tri-hypercharge proposal introduces a separate gauged weak hypercharge assigned to each fermion family as the origin of flavour. This is arguably one of the simplest setups for building "gauge non-universal theories of flavour" or "flavour deconstructed theories". In this paper we propose and study two minimal but ultraviolet complete and renormalisable tri-hypercharge models. We show that both models, which differ only by the heavy messengers that complete the effective theory, are able to explain the observed patterns of fermion masses and mixings (including neutrinos) with all fundamental coefficients being of $\mathcal{O}(1)$. In fact, both models translate the complicated flavour structure of the Standard Model into three simple physical scales above electroweak symmetry breaking, completely correlated with each other, that carry meaningful phenomenology. In particular, the heavy messenger sector determines the origin and size of fermion mixing, which controls the size and nature of the flavour-violating currents mediated by the two heavy $Z^{\prime }$ gauge bosons of the theory. The phenomenological implications of the two minimal models are compared. In both models the lightest $Z^{\prime }$ remains discoverable in dilepton searches at the LHC Run 3.

   hep-phhep-exJHEP(2024)·26 citations
3. 03*

   Up-scattering production of a sterile fermion at DUNE: complementarity with spallation source and direct detection experiments

   Pablo M. Candela🇪🇸 · Valentina De Romeri🇪🇸 · Pantelis Melas🇬🇷 · Dimitrios K. Papoulias🇬🇷 · Niki Saoulidou🇬🇷

   We investigate the possible production of a MeV-scale sterile fermion through the up-scattering of neutrinos on nuclei and atomic electrons at different facilities. We consider a phenomenological model that adds a new fermion to the particle content of the Standard Model and we allow for all possible Lorentz-invariant non-derivative interactions (scalar, pseudoscalar, vector, axial-vector and tensor) of neutrinos with electrons and first-generation quarks. We first explore the sensitivity of the DUNE experiment to this scenario, by simulating elastic neutrino-electron scattering events in the near detector. We consider both options of a standard and a tau-optimized neutrino beams, and investigate the impact of a mobile detector that can be moved off-axis with respect to the beam. Next, we infer constraints on the typical coupling, new fermion and mediator masses from elastic neutrino-electron scattering events induced by solar neutrinos in two current dark matter direct detection experiments, XENONnT and LZ. Under the assumption that the new mediators couple also to first-generation quarks, we further set constraints on the up-scattering production of the sterile fermion using coherent elastic neutrino-nucleus scattering data from the COHERENT experiment. Moreover, we set additional constraints assuming that the sterile fermion may decay within the detector. We finally compare our results and discuss how these facilities are sensitive to different regions of the relevant parameter space due to kinematics arguments and can hence provide complementary information on the up-scattering production of a sterile fermion.

   hep-phJHEP(2024)·20 citations
4. 04*

   Study of bottom quark dynamics via non-prompt $D^0$ and $J/\psi$ in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

   Wen-Jing Xing🇨🇳 · Shu-Qing Li🇨🇳 · Shanshan Cao🇨🇳 · Guang-You Qin🇨🇳

   We study bottom quark energy loss via the nuclear modification factor ($R_{\mathrm{AA}}$) and elliptic flow ($v_2$) of non-prompt $D^0$ and $J/\psi$ in relativistic heavy-ion collisions at the LHC. The space-time profile of quark-gluon plasma is obtained from the CLVisc hydrodynamics simulation, the dynamical evolution of heavy quarks inside the color deconfined QCD medium is simulated using a linear Boltzmann transport model that combines Yukawa and string potentials of heavy-quark-medium interactions, the hadronization of heavy quarks is performed using a hybrid coalescence-fragmentation model, and the decay of $B$ mesons is simulated via PYTHIA. Using this numerical framework, we calculate the transverse momentum ($p_{\mathrm{T}}$) dependent $R_{\mathrm{AA}}$ and $v_2$ of direct $D$ mesons, $B$ mesons, and non-prompt $D^0$ and $J/\psi$ from $B$ meson decay in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. We find the mass hierarchy of the nuclear modification of prompt $D$ and $B$ mesons depends on their $p_{\mathrm{T}}$. Both $R_{\mathrm{AA}}$ and $v_2$ of heavy flavor particles show strong $p_{\mathrm{T}}$ and centrality dependences due to the interplay between parton energy loss, medium geometry and flow, and hadronization of heavy quarks. Non-prompt $D^0$ and $J/\psi$ share similar patterns of $R_{\mathrm{AA}}$ and $v_2$ to $B$ mesons except for a $p_{\mathrm{T}}$ shift during the decay processes. Therefore, future more precise measurements on non-prompt $D^0$ and $J/\psi$ can help further pin down the bottom quark dynamics inside the quark-gluon plasma.

   hep-phnucl-exnucl-thPRC(2024)·9 citations
5. 05*

   Semileptonic ${\Omega }_b\to {\Omega }_c\ell {\bar{\nu }}_{\ell }$ transition in full QCD

   Z. Neishabouri🇮🇷 · K. Azizi🇮🇷 · H. R. Moshfegh🇮🇷

   We investigate the semileptonic decay of ${\Omega }_b\to {\Omega }_c\ell {\bar{\nu }}_{\ell }$ in three lepton channels. To this end, we use QCD sum rule method in three point framework to calculate the form factors defining the matrix elements of these transitions. Having calculated the form factors as building blocks, we calculate the decay widths and branching fractions of the exclusive decays in all lepton channels and compare the results with other theoretical predictions. The obtained results for branching ratios and ratio of branching fractions at different leptonic channels may help experimental groups in their search for these weak decays. Comparison of the obtained results with possible future experimental data can be useful to check the order of consistency between the standard model theory predictions and data on the heavy baryon decays.

   hep-phhep-exhep-latPRD(2024)·18 citations
6. 06*

   Search for Z' Radiating from the Dark Matter at the LHC

   Akmal Ferdiyan🇮🇩 · Reinard Primulando🇮🇩 · Qidir Maulana Binu Soesanto🇮🇩 · Bayu Dirgantara🇹🇭 · Bobby Eka Gunara🇮🇩

   We discuss a collider probe of a dark sector model in which the dark matter is charged under a new, hidden $U(1)$ gauge group. In particular, we look for the so-called Darkstrahlung process, in which the final states dark matter radiates a new $Z^{\prime }$ gauge boson and it manifests as dilepton resonances. This work emphasizes the potential of dilepton final states with missing transverse energy in probing the darkstrahlung process. We recast the ATLAS Run 2 search for dilepton resonances in association with missing energy in addition to the ATLAS and CMS searches for sleptons. We find that the recasted searches put strong constraints on the coupling between the dark matter and the $Z^{\prime }$. Moreover, we evaluate refined search strategies for $Z^{\prime }$ production and propose an analysis employing constraints on the lepton invariant mass and higher missing energy cut related to the darkstrahlung process. Simulation outcomes indicate substantial enhancements, particularly by a factor of 6 in regions featuring lower $Z^{\prime }$ masses. Finally, we also discuss the case when the $Z^{\prime }$ has a long lifetime, resulting in displaced decay of the boson.

   hep-phhep-exEPJC(2024)·1 citation
7. 07*

   Mapping the SMEFT at High-Energy Colliders: from LEP and the (HL-)LHC to the FCC-ee

   Eugenia Celada🇬🇧 · Tommaso Giani🇳🇱 · Jaco ter Hoeve🇳🇱 · Luca Mantani🇬🇧 · Juan Rojo🇳🇱 · Alejo N. Rossia🇬🇧 · Marion O. A. Thomas🇬🇧 · Eleni Vryonidou🇬🇧

   We present SMEFiT3.0, an updated global SMEFT analysis of Higgs, top quark, and diboson production data from the LHC complemented by electroweak precision observables (EWPOs) from LEP and SLD. We consider recent inclusive and differential measurements from the LHC Run II, alongside with a novel implementation of the EWPOs based on independent calculations of the relevant EFT contributions. We estimate the impact of HL-LHC measurements on the SMEFT parameter space when added on top of SMEFiT3.0, through dedicated projections extrapolating from Run II data. We quantify the significant constraints that measurements from two proposed high-energy circular $e^{+}{e}^{-}$ colliders, the FCC-ee and the CEPC, would impose on both the SMEFT parameter space and on representative UV-complete models. Our analysis considers projections for the FCC-ee and the CEPC based on the latest running scenarios and includes $Z$-pole EWPOs, fermion-pair, Higgs, diboson, and top quark production, using optimal observables for both the $W^{+}{W}^{-}$ and the $t\bar{t}$ channels. The framework presented in this work may be extended to other future colliders and running scenarios, providing timely input to ongoing studies towards future high-energy particle physics facilities.

   hep-phhep-exJHEP(2024)·129 citations
8. 08*

   Reduced cross-section in Electron-Ion Colliders at small $x$

   G.R.Boroun🇮🇷 · B.Rezaei🇮🇷

   The nuclear reduced cross section ${\sigma }_r^A$, in the kinematic range of the electron-Ion collider with center-of-mass energy $\sqrt{s}=140\mathrm{GeV}$ and $y\le 1$, is discussed. The importance of the nuclear longitudinal structure function $F_L^A$ and its behavior owing to the impact parameter for the heavy and light nucleus of Pb-208 and C-12 at $Q^2=5$ and $10{\mathrm{GeV}}^2$ is considered. The dependence of the ratios $R_{F_L}^A$ and $R_{\sigma }^A$ on the impact parameter and the expanding point of the gluon density at small $x$ are investigated. The factorized form of parton distributions in nuclei is used in HIJING2.0 model.

   hep-phEur.Phys.J.Plus(2024)·2 citations
9. 09*

   Hadronic Spectrum in the Chiral Large $N_c$ Extension of Quantum Chromodynamics

   Axel Halgaard Kristensen🇩🇰 · Thomas A. Ryttov🇩🇰

   We study Quantum Chromodynamics in the chiral large $N_c$ limit which contains a left-handed Weyl fermion in the fundamental representation, a left-handed Weyl fermion in the two index antisymmetric representation and $(N_c-3)$ left-handed Weyl fermions in the antifundamental representation of the $SU(N_c)$ gauge group. We construct gauge singlet composite operators and study their masses and correlation functions at large $N_c$. It is shown that all hadron masses scale as $\sim N_c^0{n}_q$ where $n_q$ is the number of constituent quarks in the hadron. In addition by simple gluon exchange considerations it is seen that scattering amplitudes between hadrons have the same $N_c$ scaling as the mass of the lightest hadron involved. This is the case provided the hadrons in the scattering amplitude share a sufficiently large number of constituent quarks. The chiral large $N_c$ extension also allows for other non-trivial processes. For instance we consider two different baryonium states that are unique to this extension and that decay via emissions of two- and three-quark hadrons. Also other non-trivial scattering processes are considered. Finally, we study composites made of a mix of left- and right-handed fields. We categorize multiple groups of hadrons within the full spectrum according to their flavor structure. Within these groups all $n$-point functions scale the same.

   hep-phhep-lathep-thPRD(2024)·2 citations
10. 10*

    Non-extensive statistics in Au-Au collisions

    Juliana O. Costa🇧🇷 · Isabelle Aguiar🇧🇷 · Jadna L. Barauna🇧🇷 · Eugenio Megías🇪🇸 · Airton Deppman🇧🇷 · Tiago N. da Silva🇧🇷 · Débora P. Menezes🇧🇷

    Particle production yields measured in central Au-Au collision at RHIC are obtained with free Fermi and Bose gases and also with a replacement of these statistics by non-extensive statistics. For the latter calculation, a set of different parameters was used with values of the Tsallis parameter $q$ chosen between 1.01 and 1.25, with 1.16 generating the best agreement with experimental data, an indication that non-extensive statistics may be one of the underlying features in heavy ion-collisions.

    hep-phnucl-thPLB(2024)·7 citations
11. 11*

    Axion-induced Casimir force between nuclei and dynamical axion pair creation

    Stefan Evans🇩🇪 · Ralf Schützhold🇩🇪

    We study the interaction between axions and nuclei by combining the Peccei-Quinn mechanism with results from quantum chromo-dynamics (QCD) which imply that the QCD condensates are reduced within nuclear matter. Thus, the effective axion mass is also reduced, yielding a finite axion-nucleon scattering cross section. Even in the absence of real axions, this interaction would manifest itself in a Casimir type attraction between two nuclei. Finally, accelerated nuclei can create entangled pairs of axions via the dynamical Casimir effect (or as signatures of the Unruh effect).

    hep-ph0 citations
12. 12*

    Embedded Domain Walls and Electroweak Baryogenesis

    Tobias Schröder🇩🇪 · Robert Brandenberger🇨🇦

    Embedded walls are domain wall solutions which are unstable in the vacuum but stabilized in a plasma of the early Universe. We show how embedded walls in which the electroweak symmetry is restored can lead to an efficient scenario of electroweak baryogenesis. We construct an extension of the Standard Model of particle physics in which embedded walls exist and are stabilized in an electromagnetic plasma.

    hep-phastro-ph.COgr-qchep-thPRD(2024)·14 citations
13. 13*

    A Multiverse Outside of the Swampland

    Raffaele Tito D'Agnolo🇫🇷 · Paolo Mangini🇮🇹 · Gabriele Rigo🇫🇷 · Lian-Tao Wang🇺🇸

    A Multiverse can arise from landscapes without de Sitter minima. It can be populated during a period of eternal inflation without trans-Planckian field excursions and without flat potentials. This Multiverse can explain the values of the cosmological constant and of the weak scale. In the process of proving these statements we derive a few simple, but counter-intuitive results. We show that it is easy to write models of eternal inflation compatible with the distance and refined de Sitter conjectures. Secondly, tunneling transitions that move fields from a lower-energy vacuum to a higher-energy vacuum and generate baby Universes are possible, and occur during eternal inflation. Finally, we relax the assumption of no de Sitter minima and show that this more standard Multiverse can be populated by Coleman-De Luccia transitions in about 100 $e$-folds of inflation.

    hep-phastro-ph.COgr-qchep-thPRD(2024)·4 citations
14. 14*

    Study of the electromagnetic form factors of the nucleons in the timelike region

    Qin-He Yang🇨🇳 · Di Guo🇨🇳 · Ming-Yan Li🇨🇳 · Ling-Yun Dai🇨🇳 · Johann Haidenbauer🇩🇪 · Ulf-G. Meißner🇩🇪

    The electromagnetic form factors $G_{\mathrm{E}}$ and $G_{\mathrm{M}}$ of the proton and neutron in the timelike region are extracted in a study of the processes $e^{+}{e}^{-}\to \bar{p}p$ and $e^{+}{e}^{-}\to \bar{n}n$. The reaction amplitude is evaluated within the distorted wave Born approximation, with the interaction of the antinucleon-nucleon ($\bar{N}N$) pair taken into account. The latter is constructed within $SU(3)$ chiral effective field theory up to the next-to-leading order. An excellent description of the $e^{+}{e}^{-}\to \bar{N}N$ data in the energy region from the $\bar{N}N$ threshold up to center-of-mass energies $E_{\mathrm{cm}}=2.2$~GeV is achieved. Results for the electromagnetic form factors $G_{\mathrm{E}},G_{\mathrm{M}}$, $G_{\mathrm{E}}/G_{\mathrm{M}}$, and the subtracted effective form factors, $G_{\mathrm{osc}}$, are provided. These can be helpful for further studies of the properties of the nucleons.

    ↳ nucl-thhep-phJHEP(2024)·8 citations
15. 15*

    Constraints on extra dimensions theories from gravitational quantum barrier experiments

    J. M. Rocha🇧🇷 · F. Dahia🇧🇷

    We discuss the quantum-bouncer experiment involving ultracold neutrons in a braneworld scenario. Extra-dimensional theories typically predict the strengthening of gravitational interactions over short distances. In this paper, we specifically study the anomalous gravitational interaction between the bouncing neutron and the reflecting mirror, resulting from hidden dimensions, and its effect on the outcome of this experiment in the context of a thickbrane model. This analysis allows us to identify which physical quantity of this extra-dimensional theory this neutron experiment is capable of constraining. Based on the experimental data, we found a new and independent empirical bound on free parameters of the model: the higher-dimensional gravitational constant and a parameter related to a transverse width of the confined matter inside the thickbrane. This new bound is valid in scenarios with an arbitrary number of extra dimensions greater than two. In this manner, by considering the thickness of the brane, we have been able to extend previous studies on this topic, which were limited to models with few codimensions, due to non-computability problems of power-law corrections of the gravitational potential.

    ↳ gr-qchep-phnucl-thquant-phClass.Quant.Grav.(2024)·2 citations
16. 16*

    The LISA forecast on a smooth crossover beyond the Standard Model through the scalar-induced gravitational waves

    Albert Escrivà🇯🇵 · Ryoto Inui🇯🇵 · Yuichiro Tada🇯🇵 · Chul-Moon Yoo🇯🇵

    Supposing the Laser Interferometer Space Antenna (LISA) gravitational wave (GW) detector, we exhibit the detectability of a hypothetical smooth crossover in the early universe beyond the Standard Model of particle physics through the scalar-induced gravitational wave (SIGW) in terms of the Fisher forecast. A crossover at $\sim 100\mathrm{TeV}$ can leave a signal on the GW spectrum in the $\sim \mathrm{mHz}$ frequency range, the sweet spot of the LISA sensitivity. These possibilities are also interesting in the primordial black hole (PBH) context as the associated PBH mass $\sim 10^{22}\mathrm{g}$ lies at the window to explain the whole dark matter. We found that the properties of the crossover can be well determined if the power spectrum of primordial scalar perturbations are as large as $\sim 5\times 10^{-4}$ on the corresponding scale $\sim 10^{12}\mathrm{Mp}{\mathrm{c}}^{-1}$.

    ↳ astro-ph.COhep-phPRD(2025)·12 citations
17. 17*

    Nucleon microscopy in proton-nucleus scattering via analysis of bremsstrahlung emission: role of incoherent emission

    Sergei P. Maydanyuk (1,2,4)🇭🇺 · Li-Ping Zou (2)🇨🇳 · Peng-Ming Zhang (3) ((1) Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai, China, (2) Wigner Research Centre for Physics, Budapest, Hungary, (3) School of Physics and Astronomy, Sun Yat-Sen University, Zhuhai, China, (4) Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine)🇨🇳

    We study electromagnetic form factors of protons in proton-nucleus scattering via analysing of experimental cross-sections of accompanying bremsstrahlung photons. A new bremsstrahlung model for proton-nucleus scattering is developed, where a main focus is given on incoherent bremsstrahlung that has not been considered previously. In analysis we choose experimental bremsstrahlung data of $p$ + ${}^{197}$Au scattering at proton beam energy of 190 MeV obtained by TAPS collaboration. We find the following. (1) Inclusion of incoherent emission to calculations improves agreements with experimental data essentially, contribution of incoherent bremsstrahlung is essentially larger than coherent one. (2) Inclusion of form factors of the scattered proton improves agreement with experimental data in comparison with calculations with coherent and incoherent contributions without form factors. (3) Sensitivity of model in study of form factors of the scattered proton is high. This demonstrates a new opportunity to study internal structure of protons under influence of nuclear forces in nuclear scattering.

    ↳ nucl-thhep-phPRC(2025)·0 citations
18. 18*

    Cosmology from String T-duality and zero-point length

    Giuseppe Gaetano Luciano🇪🇸 · Ahmad Sheykhi🇮🇷

    Inspired by String T-duality and taking into account the zero-point length correction, $l_0$, to the gravitational potential, we construct modified Friedmann equations by applying the first law of thermodynamics on the apparent horizon of the Friedmann-Robertson-Walker (FRW) Universe. The cosmological viability of this extended scenario is investigated by studying influences on the evolution of the early Universe and performing the cosmographic analysis. Furthermore, we explore the inflationary paradigm under the slow-roll condition. By testing the model against observational data, the zero-point length is constrained around the Planck scale, in compliance with the original assumption from String T-duality. We also study the growth of density perturbations in the linear regime. It is shown that the zero-point length stands out as an alternative characterization for the broken-power-law spectrum, which provides a better fitting for the experimental measurements comparing to the simple power-law potential. Finally, we focus on implications for the primordial gravitational waves (PGWs) spectrum. Should the zero-point length be running over energy scales, as is the case for all parameters and coupling constants in quantum gravity under renormalization group considerations, deviations from General Relativity (GR) might be potentially tested through upcoming PGW observatories.

    ↳ gr-qchep-phhep-thEPJC(2024)·11 citations
19. 19*

    Inflation, the Hubble Tension and Early Dark Energy: an alternative overview

    William Giarè🇬🇧

    I review and discuss the possible implications for inflation resulting from considering new physics in light of the Hubble tension. My study is motivated by a simple argument that the constraints on inflationary parameters, most typically the spectral index $n_s$, depend to some extent on the cosmological framework. To avoid broadening the uncertainties resulting from marginalizing over additional parameters (typical in many alternative models), I first adopt the same alternative viewpoint of previous studies and analyze what happens if a physical theory can fix extra parameters to non-standard values. Focusing on the dark energy equation of state $w$ and the effective number of relativistic species $N_{\mathrm{eff}}$, I confirm that physical theories able to fix $w\approx -1.2$ or $N_{\mathrm{eff}}\approx 3.9$ produce values of $H_0$ from CMB and BAO in line with the local distance ladder estimate. While in the former case I do not find any relevant implications for inflation, in the latter scenarios, I observe a shift towards $n_s\approx 1$. From a model-selection perspective, both cases are strongly disfavored compared to $\Lambda$CDM. However, models with $N_{\mathrm{eff}}\approx 3.3-3.4$ could bring the $H_0$ tension down to $\sim 3\sigma$ while being moderately disfavored. Yet, this is enough to change the constraints on inflation so that the most accredited models (e.g., Starobinsky inflation) would no longer be favored by data. I then focus on Early Dark Energy (EDE), arguing that an EDE fraction $f_{\mathrm{EDE}}\sim 0.04-0.06$ (only able to mildly reduce the $H_0$-tension down to $\sim 3\sigma$) could already require a similar change in perspective on inflation. In fact, performing a full joint analysis of EDE and Starobinsky inflation, I find that the two models can hardly coexist for $f_{\mathrm{EDE}}\gtrsim 0.06$.

    ↳ astro-ph.COhep-phPRD(2024)·64 citations
20. 20*

    Hypernuclear constraints on the existence and lifetime of a deeply bound $H$ dibaryon

    Avraham Gal🇮🇱

    We study to what extent the unique observation of $\Lambda \Lambda$ hypernuclei by their weak decay into known $\Lambda$ hypernuclei, with lifetimes of order 10${}^{-10}$ s, rules out the existence of a deeply bound doubly-strange ($\mathcal{S}$=$-$2) $H$ dibaryon. Treating ${}_{\Lambda \Lambda }^6\mathrm{He}$ (the Nagara emulsion event) in a realistic $\Lambda -\Lambda -{}^4$He three-body model, we find that the ${}_{\Lambda \Lambda }^6\mathrm{He}\to H+{}^4\mathrm{He}$ strong-interaction lifetime increases beyond 10${}^{-10}$ s for $m_H<m_{\Lambda }+m_n$, about 176 MeV below the $\Lambda \Lambda$ threshold, so that such a deeply bound $H$ is not in conflict with hypernuclear data. Constrained by $\Lambda$ hypernuclear $\Delta \mathcal{S}$=1 nonmesonic weak-interaction decay rates, we follow EFT methods to evaluate the $\Delta \mathcal{S}$=2 $H\to nn$ weak-decay lifetime of $H$ in the mass range $2m_n\lesssim m_H<m_{\Lambda }+m_n$. The resulting $H$ lifetime is of order 10${}^5$ s, many orders of magnitude shorter than required to qualify for a dark-matter candidate.

    ↳ nucl-thhep-phnucl-exPLB(2024)·13 citations
21. 21*

    Hydrodynamic Attractor in Ultracold Atoms

    Keisuke Fujii🇯🇵 · Tilman Enss🇩🇪

    The hydrodynamic attractor is a concept that describes universal equilibration behavior in which systems lose microscopic details before hydrodynamics becomes applicable. We propose a setup to observe hydrodynamic attractors in ultracold atomic gases, taking advantage of the fact that driving the two-body $s$-wave scattering length causes phenomena equivalent to isotropic fluid expansions. We specifically consider two-component fermions with contact interactions in three dimensions and discuss their dynamics under a power-law drive of the scattering length in a uniform system. By explicit computation, we derive a hydrodynamic relaxation model. We analytically solve their dynamics and find the hydrodynamic attractor solution. Our proposed method using the scattering length drive is applicable to a wide range of ultracold atomic systems, and our results establish these as a new platform for exploring hydrodynamic attractors.

    ↳ cond-mat.quant-gashep-phhep-thnucl-thPRL(2024)·15 citations
22. 22*

    Supergeometric Approach to Quantum Field Theory

    Viola Gattus🇬🇧 · Apostolos Pilaftsis🇬🇧

    We review a recently proposed SuperGeometric (SG) approach to Quantum Field Theories (QFTs) that allow for scalar-fermion field transformations in a manifestly reparameterisation covariant manner. By adopting natural choices for the field-space supermetric, we show how a non-trivial field-space Riemannian curvature can be introduced in the fermionic sector, beyond the usual one that may have its origin in the scalar part of the theory. We present a minimal SG-QFT model with proper non-zero fermionic curvature both in two and four spacetime dimensions. Possible future directions in further developing SG-QFTs are discussed.

    ↳ hep-thhep-phPoS(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.