Wed·Mar 8, 2023Wednesday·March 8, 2023

1. 01*

   Probing Electroweak Phase Transition in the Singlet Standard Model via $bb\gamma \gamma$ and 4$l$ channels

   Wenxing Zhang🇨🇳 · Hao-Lin Li🇧🇪 · Kun Liu🇨🇳 · Michael J. Ramsey-Musolf🇨🇳 · Yonghao Zeng🇨🇳 · Suntharan Arunasalam🇨🇳

   We investigate the prospects for resonant di-Higgs and heavy Higgs production searches at the 14 TeV HL-LHC in the combination of $bb\gamma \gamma$ and $4l$ channels, as a probe of a possible first order electroweak phase transition in real singlet scalar extension of the Standard Model. Event selection follows those utilized in the $bb\gamma \gamma$ and $4l$ searches by the ATLAS Collaboration, applied to simulation using benchmark parameters that realize a strong first order electroweak phase transition. The output of discriminant analysis is implemented by numerical calculation, optimised by the joint restriction from the two channels. The prospective reach for $bb\gamma \gamma$/$4l$ channel could be more competitive in probing the electroweak phase transition at lower/higher resonance masses. With 3 $a{b}^{-1}$ integrated luminosity, the combination of the $bb\gamma \gamma$ and $4l$ channels can discover/exclude a significant portion of %\mrmC{isn't it more accurate to say "a significant portion of" ?} of the viable parameter space that realizes a strong first order phase transition when the resonance mass is heavier than 500 GeV.

   hep-phhep-exJHEP(2023)·20 citations
2. 02*

   Molecular states in $D_s^{(\ast )+}{\Xi }_c^{{(}^{\prime },\ast )}$ systems

   Nijiati Yalikun🇨🇳 · Xiang-Kun Dong🇨🇳 · Bing-Song Zou🇨🇳

   The possible hadronic molecules in $D_s^{(\ast )+}{\Xi }_c^{{(}^{\prime },\ast )}$ systems with $J^P=1/2^{-},3/2^{-}$ and $5/2^{-}$ are investigated with interactions described by light meson exchanges. By varying the cutoff in a phenomenologically reasonable range of $1\sim 2.5$ GeV, we find ten near-threshold (bound or virtual) states in the single-channel case. After introducing the coupled-channel dynamics of $D_s^{+}{\Xi }_c$-$D_s^{+}{\Xi }_c^{{}^{\prime }}$-$D_s^{\ast +}{\Xi }_c$-$D_s^{+}{\Xi }_c^{\ast }$-$D_s^{\ast +}{\Xi }_c^{{}^{\prime }}$-$D_s^{\ast +}{\Xi }_c^{\ast }$ systems, these states, except those below the lowest channels in each $J^P$ sector, move into the complex energy plane and become resonances in the mass range of $4.43\sim 4.76$ GeV. Their spin-parities and nearby thresholds are $1/2^{-}(D_s^{+}{\Xi }_c)$, $1/2^{-}(D_s^{+}{\Xi }_c^{{}^{\prime }})$, $1/2^{-}(D_s^{\ast +}{\Xi }_c)$,$1/2^{-}(D_s^{\ast +}{\Xi }_c^{{}^{\prime }})$, $1/2^{-}(D_s^{\ast +}{\Xi }_c^{\ast })$ , $3/2^{-}(D_s^{\ast +}{\Xi }_c)$, $3/2^{-}(D_s^{+}{\Xi }_c)$, $3/2^{-}(D_s^{\ast +}{\Xi }_c^{{}^{\prime }})$, $3/2^{-}(D_s^{\ast +}{\Xi }_c^{\ast })$, and $5/2^{-}(D_s^{\ast +}{\Xi }_c^{\ast })$. The impacts of the $\delta (r)$-term in the one-boson-exchange model on these states are presented. Setting $\Lambda =1.5$ GeV as an illustrative value, it is found that $1/2^{-}(D_s^{+}{\Xi }_c)$ is a stable bound state (becoming unstable if turning on the coupling to lower channels), $1/2^{-}(D_s^{\ast +}{\Xi }_c)$ and $3/2^{-}(D_s^{\ast +}{\Xi }_c)$ are physical resonances in both cases of including or excluding the $\delta (r)$-term, while the other seven states are physical resonances or ``virtual-state-like" poles near thresholds, depending on including the $\delta (r)$-term or not. In addition, the partial decay widths of the physical resonances are provided. These double-charm hidden-strangeness pentaquark states, as the partners of experimentally observed $P_c$ and $P_{cs}$ states, can be searched for in the $D^{(\ast )}{\Lambda }_c$ final states in future.

   hep-phnucl-thCPC(2023)·12 citations
3. 03*

   The study on the structure of exotic states ${\chi }_{c1}(3872)$ via beauty-hadron decays in $pp$ collisions at $\sqrt{s}=8\mathrm{TeV}$

   Chun-tai Wu🇨🇳 · Zhi-Lei She🇨🇳 · Xin-Ye Peng🇨🇳 · Xiao-Lin Kang🇨🇳 · Hong-Ge Xu Dai-Mei Zhou🇨🇳 · Gang Chen🇨🇳 · Ben-Hao Sa🇨🇳

   A dynamically constrained phase-space coalescence (DCPC) model was introduced to study the exotic state ${\chi }_{c1}(3872)$ yield for three possible structures: tetraquark state, nuclear-like state, and molecular state respectively, where the hadronic final states generated by the parton and hadron cascade model (PACIAE). The ${\chi }_{c1}(3872)$/$\psi (2S)$ cross-section ratio from beauty-hadron decays (non-prompt) based on the ${\chi }_{c1}(3872)$ or $\psi (2S)\to J/\psi {\pi }^{+}{\pi }^{-}$ bound state in the decay chains as a function of charged-particle multiplicity and transverse momentum in $pp$ collisions at $\sqrt{s}=8\mathrm{TeV}$ are calculated. A tetraquark state scenario from PACIAE+DCPC model shows better agreement with the LHCb and ATLAS measurements for the non-prompt ${\chi }_{c1}(3872)$/$\psi (2S)$ cross-section ratio distributions, indicating that the ${\chi }_{c1}(3872)$ is more likely to be a compact tetraquark state.

   hep-phnucl-thPRD(2023)·11 citations
4. 04*

   Dark Vector Mesons at LHC Forward Detector Searches

   Takumi Kuwahara🇨🇳 · Shu-Run Yuan🇨🇳

   Confining gauge dynamics in dark sector is promising to provide dark matter with a mass in the range of sub-GeV to GeV. These dark sectors consist of composite particles, such as dark baryons and dark mesons, that are neutral under the standard-model charge. Dark photon is introduced as a portal matter between the dark sector and the standard-model sector in order to alleviate cosmological problems, and dark hadrons are produced through the same dark photon at accelerator-based experiments. As dark vector mesons and dark pions have the similar masses, dark vector mesons can be long-lived particles, which will be explored by far-detector experiments. In this study, we study the future prospect of the LHC forward-detector experiments, FASER2 and FACET, for exploring the dark vector mesons. When dark photon is heavier than dark pions, the LHC forward-detector searches can be comparable to DarkQuest, and the invisible decay searches of dark photons can also explore the same parameter space. Meanwhile, when dark photon is lightest in the dark sector, their future prospect will be comparable to the visible decay searches for dark photons at LHCb, Belle-II, and HPS.

   hep-phJHEP(2023)·9 citations
5. 05*

   Ultraviolet regularization of energy between two static sources in the bottom-up holographic approach to strong interactions

   S.S. Afonin🇷🇺

   It is well known that the potential energy between two heavy quarks carries an important information about the physics of confinement. Using the Wilson loop confinement criterion and the Nambu-Goto string action, this energy can be derived within the bottom-up holographic approach to strong interactions. We recapitulate the standard holographic derivation of the potential between two static sources with emphasis on the physical interpretation of the results. After that we consider the problem of regularization of arising ultraviolet divergence in a general case. Here the term "ultraviolet" means small values of the holographic coordinate which is related with the inverse energy scale in the holographic duality. We show that in the case of widely used Soft-Wall holographic models, in principle, many ultraviolet divergences may appear, although in practice the appearance of more than two different divergences looks somewhat exotic. Some possible subtraction schemes are discussed. Different schemes lead to a different constant shift of the potential energy and this entails a certain scheme-dependence of holographic predictions for constant term in resulting Cornell-like confinement potentials.

   hep-phTheor.Math.Phys.(2023)·2 citations
6. 06*

   Spectroscopic Study of ${\Omega }_{cc}$, ${\Omega }_{cb}$ and ${\Omega }_{bb}$ Baryons

   Amee Kakadiya · Ajay Kumar Rai

   In this paper, we presented the mass spectra of the doubly heavy $\Omega$ baryons containing one light (strange) quark and two heavy (charm and bottom) quarks. Our predicted masses can be consider to determine the $J^p$ value for the resonances detected by experimental facilities in future. The masses of ground excited states (1S-6S, 1P-3P, 1D-2D, 1F-2F) are calculated for all possible $J^p$ values, using the Hypercentral Constituent Quark Model (hCQM), by employing screened potential as confining potential with color-Coloumb potential. Regge trajectories are also plotted in $(J,M^2)$ plane for natural and unnatural parities. Doubly heavy Omega states are not declared yet by any experimental facility. We compared our results to the predictions gained from other theoretical approaches, and we found that our predictions are quite close to those of them. Other properties such as magnetic moment (for spin state $\frac{1}{2}$ and $\frac{3}{2}$) and radiative decay width are calculated using the enuerated masses.

   hep-phInt.J.Mod.Phys.A(2022)·22 citations
7. 07*

   Comparative study of the heavy-quark dynamics with the Fokker-Planck Equation and the Plastino-Plastino Equation

   Eugenio Megias🇪🇸 · Airton Deppman🇧🇷 · Roman Pasechnik🇸🇪 · Constantino Tsallis🇧🇷

   The Fokker-Planck Equation (FPE) is a fundamental tool for the investigation of kinematic aspects of a wide range of systems. For systems governed by the non-additive entropy $S_q$, the Plastino-Plastino Equation (PPE) is the correct generalization describing the kinematic evolution of such complex systems. Both equations have been applied for investigations in many fields, and in particular for the study of heavy quark evolution in the quark-gluon plasma. In the present work, we use this particular problem to compare the results obtained with the FPE and the PPE and discuss the different aspects of the dynamical evolution of the system according to the solutions for each equation. The comparison is done in two steps, first considering the modification that results from the use of a different partial derivative equation with the same transport coefficients, and then investigating the modifications by using the non-additive transport coefficients. We observe clear differences in the solutions for all the cases studied here and discuss possible experimental investigations that can indicate which of those equations better describes the heavy-quark kinematics in the medium. The results obtained here have implications in the study of anomalous diffusion in porous and granular media, in Cosmology and Astrophysics. The obtained results reinforce the validity of the relation $(q-1{)}^{-1}=(11/3)N_c-(4/3)(N_f/2)$, where $N_c$ and $N_f$ are, respectively, the number of colours and the effective number of flavours. This equation was recently established in the context of a fractal approach to QCD in the non-perturbative regime.

   hep-phhep-thPLB(2023)·10 citations
8. 08*

   Jet polarisation in an anisotropic medium

   Sigtryggur Hauksson🇫🇷 · Edmond Iancu🇫🇷

   We study the evolution of an energetic jet which propagates in an anisotropic quark-gluon plasma, as created in the intermediate stages of ultrarelativistic heavy-ion collisions. We argue that the partons of the jet should acquire a non-zero average polarisation proportional to the medium anisotropy. We first observe that the medium anisotropy introduces a difference between the rates for transverse momentum broadening along the two directions perpendicular to the jet axis. In turn, this difference leads to a polarisation-dependent bias in the BDMPS-Z rates for medium-induced gluon branching. Accordingly, the daughter gluons in a branching process can carry net polarisation even if their parent gluon was unpolarised. Using these splitting rates, we construct kinetic equations which describe the production and transmission of polarisation via multiple branching in an anisotropic medium. The solutions to these equations show that polarisation is efficiently produced via quasi-democratic branchings, but then it is rapidly washed out by the subsequent branchings, due to the inability of soft gluons to keep trace of the polarisation of their parents. Based on that, we conclude that a net polarisation for the jet should survive in the final state if and only if the medium anisotropy is sizeable as the jet escapes the medium.

   hep-phnucl-thJHEP(2023)·39 citations
9. 09*

   Doubly heavy tetraquarks: heavy quark bindings and chromomagnetically mixings

   Xin-Yue Liu🇨🇳 · Wen-Xuan Zhang🇨🇳 · Duojie Jia🇨🇳

   We introduce an enhanced binding energy $B_{QQ}$ between heavy-heavy quarks $QQ$ and a flux-tube correction into the chromomagnetic interaction model to study nonstrange doubly-heavy tetraquarks $T_{QQ}$ ($Q=c,b)$. A simple relation in terms of baryon masses is proposed to estimate the binding energies $B_{QQ}$ and thereby map the flux-tube corrections in doubly-heavy tetraquarks $T_{cc}$, $T_{bb}$ and $T_{bc}$. Our computation via diagonalization of chromomagnetic interaction predicts the doubly charmed tetraquark $T_{cc}$ (in color rep. ${\bar{3}}_c\otimes 3_c$) and $T_{cc}^{\ast }$ (in $6_c\otimes {\bar{6}}_c$) with $I{J}^P=01^{+}$ to have masses of $3879.2$ MeV and $4287.6$ MeV, respectively, with the former being in consistent with the measured mass $3874.7\pm 0.05$ MeV of the doubly charmed tetraquark $T_{cc}(1^{+})=cc\bar{u}\bar{d}$ discovered by LHCb. Further mass predictions are given of the doubly bottom tetraquarks $T_{bb}$ and the bottom-charmed tetraquarks $T_{bc}$ with $J^P=0^{+},1^{+},2^{+}$ and $I=0,1$. A chromomagnetical mixing between the color configurations ${\bar{3}}_c\otimes 3_c$ and $6_c\otimes {\bar{6}}_c$ is noted for the bottom-charmed states $T_{bc}$ with $I{J}^P=01^{+}$ and $I{J}^P=1(0^{+},1^{+})$.

   hep-phPRD(2023)·17 citations
10. 10*

    Towards a universal description of hadronic phase of QCD

    Aman Abhishek🇮🇳 · Sayantan Sharma🇮🇳

    Mean-field model quantum field theories of hadrons were traditionally developed to describe cold and dense nuclear matter and are by now very well constrained from the recent neutron star merger observations. We show that when augmented with additional known hadrons and resonances but not included earlier, these mean-field models can be extended beyond its regime of applicability. Calculating some specific ratios of baryon number susceptibilities for finite temperature and moderate values of baryon densities within mean-field approximation, we show that these match consistently with the lattice QCD data available at lower densities, unlike the results obtained from a non-interacting hadron resonance gas model. We also estimate the curvature of the line of constant energy density, fixed at its corresponding value at the chiral crossover transition in QCD, in the temperature-density plane. The number density at low temperatures and high density is found to be about twice the nuclear saturation density along the line of constant energy density of $ϵ=348\pm 41$ MeV/${\text{fm}}^3$. Moreover from this line we can indirectly constrain the critical end-point of QCD to be beyond ${\mu }_B=596$ MeV for temperature $\sim 125$ MeV.

    hep-phhep-latnucl-thPRD(2024)·2 citations
11. 11*

    Discovery prospects with the Dark-photons & Axion-Like particles Interferometer

    Javier De Miguel🇯🇵 · Juan F. Hernández-Cabrera🇪🇸 · Elvio Hernández-Suárez🇪🇸 · Enrique Joven-Álvarez🇪🇸 · Chiko Otani🇯🇵 · J. Alberto Rubiño-Martín (on behalf of the DALI Collaboration)🇪🇸

    We discuss the discovery potential of the Dark-photons & Axion-Like particles Interferometer (DALI) in this letter. The apparatus, currently in a design and prototyping phase, will probe axion dark matter from the Teide Observatory, an environment protected from terrestrial microwave sources, reaching Dine--Fischler--Srednicki--Zhitnitsky-like axion sensitivity in the range 25--250 $\mu$eV of mass. The experimental approach shows a potential to probe dark sector photons of kinetic mixing strength in excess of several $10^{-16}$, and to establish new constraints to a stochastic gravitational wave background in its band. We identify different branches, including cosmology, stellar, and particle physics, where this next-generation halo-telescope may play a role in coming years.

    hep-phastro-ph.COhep-exPRD(2024)·44 citations
12. 12*

    The newly observed ${\Omega }_c(3327)$: A good candidate for a $D$-wave charmed baryon

    Si-Qiang Luo🇨🇳 · Xiang Liu🇨🇳

    The newly observed ${\Omega }_c(3327)$ gives us a good chance to construct the ${\Omega }_c$ charmed baryon family. In this work, we carry out the mass spectrum analysis by a non-relativistic potential model using Gaussian Expansion Method, and the study of its two-body Okubo-Zweig-Iizuka allowed strong decay behavior. Our results imply that the ${\Omega }_c(3327)$ is good candidate of ${\Omega }_c(1D)$ state with $J^P=5/2^{+}$. We also predict the spectroscopy behavior of other ${\Omega }_c(1D)$ states, which may provide further clues to their search.

    hep-phhep-exPRD(2023)·30 citations
13. 13*

    The Pentaquark Spectrum from Fermi Statistics

    Luciano Maiani🇮🇹 · Antonio D. Polosa🇮🇹 · Veronica Riquer🇮🇹

    We study compact hidden charm pentaquarks in the Born-Oppenheimer approximation, previously introduced for tetraquarks, assuming the heavy pair to be in a color octet. We show that Fermi statistics applied to the complex of the three light quarks, also in color octet, requires S-wave pentaquark ground states to consist of three octets of flavour-SU(3)_f, two with spin 1/2 and one with spin 3/2, in line with the observed, strangeness S=0,-1, spectrum. Additional lines corresponding to decays into J/\psi + Sigma and J/\psi + Xi are predicted. In the language of non-relativistic SU(6), ground state pentaquarks form either a 56 or a 20 representation, distinguished by presence or absence of pentaquarks decaying in the spin 3/2 decuplet, e.g. in J/\psi + Delta^++. Observation of a strangeness S=-2 or isospin I=3/2 pentaquarks would be a clear signature of compact, QCD bound pentaquarks.

    hep-phEPJC(2023)·7 citations
14. 14*

    Scouting for dark showers at CMS and LHCb

    Susan Born🇺🇸 · Rohith Karur🇺🇸 · Simon Knapen🇺🇸 · Jessie Shelton🇺🇸

    We assess the capabilities of the CMS and LHCb searches for low-$p_T$ displaced dimuon pairs to discover hidden valley models, using a newly-developed benchmark model that realizes a range of dimuon vertex topologies. We show that the data scouting techniques used in these searches provide unique sensitivity and we make some additional suggestions to further extend the scope of future experimental searches.

    hep-phPRD(2023)·24 citations
15. 15*

    Neutrinoless double-beta decay in the neutrino-extended Standard Model

    Wouter Dekens🇺🇸 · Jordy de Vries🇳🇱 · Emanuele Mereghetti🇺🇸 · Javier Menéndez🇪🇸 · Pablo Soriano🇪🇸 · Guanghui Zhou🇳🇱

    We investigate neutrinoless double-beta decay ($0\nu \beta \beta$) in the minimal extension of the standard model of particle physics, the $\nu$SM, where gauge-singlet right-handed neutrinos give rise to Dirac and Majorana neutrino mass terms. We focus on the associated sterile neutrinos and argue that the usual evaluation of their contributions to $0\nu \beta \beta$, based on mass-dependent nuclear matrix elements, is missing important contributions from neutrinos with ultrasoft and hard momenta. We identify the hadronic and nuclear matrix elements that enter the new contributions, and calculate all relevant nuclear matrix elements for ${}^{136}$Xe using the nuclear shell model. Finally, we illustrate the impact on $0\nu \beta \beta$ rates in specific neutrino mass models and show that the new contributions significantly alter the $0\nu \beta \beta$ rate in most parts of the $\nu$SM parameter space.

    hep-phhep-exnucl-exnucl-thPRC(2023)·37 citations
16. 16*

    Lifetime and confinement of a quasi-gluon

    Fabio Siringo🇮🇹 · Giorgio Comitini🇮🇹

    The existence of genuine complex conjugated poles in the gluon propagator is discussed and related to confinement, string tension and condensates. The existence of the anomalous poles leads to an untrivial analytic continuation from Euclidean to Minkowski space, where the pole part of the propagator is related to the spectrum of excited quasigluons.

    ↳ hep-thhep-lathep-phActa Phys.Polon.Supp.(2023)·3 citations
17. 17*

    Search for jet quenching effects on the plain jet mass in Pb+Pb collisions at the LHC with a multiphase transport model

    Xiang-Pan Duan🇨🇳 · Guo-Liang Ma🇨🇳

    The plain jet mass distributions of reconstructed jets are investigated in p+p and 0-10$\%$ most central Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76\mathrm{TeV}$ using a dynamical multiphase transport model with a string melting mechanism. It is observed that the mean charged jet mass increases with increasing jet transverse momentum and jet radius in central Pb+Pb collisions. It is demonstrated that the plain jet mass of reconstructed partonic jet is shifted to a higher value after the evolution of partonic stage due to jet quenching in central Pb+Pb collisions. However, the jet mass shift effect is strongly weakened by non-perturbative effects from hadronization and hadron rescatterings. This makes it difficult to observe significant hot medium modification effects on the plain jet mass distribution in the final state of relativistic heavy-ion collisions.

    ↳ nucl-thhep-phnucl-exEPJA(2023)·3 citations
18. 18*

    Improved Superscaling in Quasielastic Electron Scattering with Relativistic Effective Mass

    P.R. Casale🇪🇸 · J.E. Amaro🇪🇸 · V.L. Martinez-Consentino🇪🇸 · I. Ruiz Simo🇪🇸

    Superscaling in electron scattering from nuclei is re-examined paying special attention to the definition of the averaged single-nucleon responses. The validity of the extrapolation of nucleon responses in the Fermi gas has been examined, which previously lacked a theoretical foundation. To address this issue, we introduce new averaged responses with a momentum distribution smeared around the Fermi surface, allowing for momenta above the Fermi momentum. This approach solves the problem of negativity in the extrapolation away from the scaling region and, at the same time, validates its use in the scaling analysis. This work has important implications for the interpretation of scaling data and contributes to the development of a more complete understanding of the scaling approach.

    ↳ nucl-thhep-phUniverse(2023)·8 citations
19. 19*

    Charting the Skyrmion Free-Energy Landscape

    Juan Carlos Criado🇬🇧 · Peter D. Hatton🇬🇧 · Álvaro Lanza · Sebastian Schenk🇬🇧 · Michael Spannowsky🇬🇧

    Chiral magnets with Dzyaloshinskii-Moriya interactions feature a rich phase diagram with a variety of thermodynamical phases. These include helical and conical spin arrangements and topologically charged objects such as (anti)skyrmions. Crucially, due to hysteresis effects, the thermodynamical phases can co-exist at any given temperature and external magnetic field, typically leading to metastability of, e.g., the material's topological phase. In this work, we use Monte Carlo simulations to study these effects. We compute the relative free energies of co-existing states, enabling us to determine the ground state at all values of the external parameters. We also introduce a method to estimate the activation energy, i.e. the height of the energy barrier that separates the topological phase from the ground state. This is one of the key ingredients for the determination of the skyrmion lifetime, which is relevant for technological applications. Finally, we prescribe predicting the system's evolution through any path in the space of external parameters. This can serve as a guideline to prepare the magnetic material in any desired phase or even trigger a phase transition in an experimental setup.

    ↳ cond-mat.str-elcond-mat.mtrl-scihep-phPRB(2024)·1 citation
20. 20*

    The Neutron Mean Life and Big Bang Nucleosynthesis

    Tsung-Han Yeh🇨🇦 · Keith A. Olive🇺🇸 · Brian D. Fields🇺🇸

    We explore the effect of neutron lifetime and its uncertainty on standard big-bang nucleosynthesis (BBN). BBN describes the cosmic production of the light nuclides ${}^1\mathrm{H}$, $\mathrm{D}$, ${}^3\mathrm{H}$+${}^3\mathrm{He}$, ${}^4\mathrm{He}$, and ${}^7\mathrm{Li}$+${}^7\mathrm{Be}$ in the first minutes of cosmic time. The neutron mean life ${\tau }_n$ has two roles in modern BBN calculations: (1) it normalizes the matrix element for weak $n\leftrightarrow p$ interconversions, and (2) it sets the rate of free neutron decay after the weak interactions freeze out. We review the history of the interplay between ${\tau }_n$ measurements and BBN, and present a study of the sensitivity of the light element abundances to the modern neutron lifetime measurements. We find that ${\tau }_n$ uncertainties dominate the predicted ${}^4\mathrm{He}$ error budget, but these theory errors remain smaller than the uncertainties in ${}^4\mathrm{He}$ observations, even with the dispersion in recent neutron lifetime measurements. For the other light-element predictions, ${\tau }_n$ contributes negligibly to their error budget. Turning the problem around, we combine present BBN and cosmic microwave background (CMB) determinations of the cosmic baryon density to $\text{predict}$ a "cosmologically preferred" mean life of ${\tau }_n(\mathrm{BBN}+\mathrm{CMB})=870\pm 16\sec$, which is consistent with experimental mean life determinations. We go on to show that if future astronomical and cosmological helium observations can reach an uncertainty of ${\sigma }_{\mathrm{obs}}(Y_p)=0.001$ in the ${}^4\mathrm{He}$ mass fraction $Y_p$, this could begin to discriminate between the mean life determinations.

    ↳ astro-ph.COhep-phnucl-exnucl-thUniverse(2023)·14 citations
21. 21*

    Ultra-High-Resolution Detector Simulation with Intra-Event Aware GAN and Self-Supervised Relational Reasoning

    Baran Hashemi🇩🇪 · Nikolai Hartmann🇩🇪 · Sahand Sharifzadeh🇩🇪 · James Kahn🇩🇪 · Thomas Kuhr🇩🇪

    Simulating high-resolution detector responses is a computationally intensive process that has long been challenging in Particle Physics. Despite the ability of generative models to streamline it, full ultra-high-granularity detector simulation still proves to be difficult as it contains correlated and fine-grained information. To overcome these limitations, we propose Intra-Event Aware Generative Adversarial Network (IEA-GAN). IEA-GAN presents a Relational Reasoning Module that approximates an event in detector simulation, generating contextualized high-resolution full detector responses with a proper relational inductive bias. IEA-GAN also introduces a Self-Supervised intra-event aware loss and Uniformity loss, significantly enhancing sample fidelity and diversity. We demonstrate IEA-GAN's application in generating sensor-dependent images for the ultra-high-granularity Pixel Vertex Detector (PXD), with more than 7.5 M information channels at the Belle II Experiment. Applications of this work span from Foundation Models for high-granularity detector simulation, such as at the HL-LHC (High Luminosity LHC), to simulation-based inference and fine-grained density estimation. To our knowledge, IEA-GAN is the first algorithm for faithful ultra-high-granularity full detector simulation with event-based reasoning.

    ↳ physics.ins-detcs.AIcs.CVhep-ph+1Nature Commun.(2024)·57 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.