Mon·Feb 13, 2023Monday·February 13, 2023

1. 01*

   Langevin simulation of dark matter kinetic equilibration

   Seyong Kim🇰🇷 · M. Laine🇨🇭

   Recently it has been questioned, notably in the context of the scalar singlet dark matter model with $m_{\phi }^{}\simeq 60$ GeV, how efficiently kinetic equilibrium is maintained if freeze-out dynamics is pushed down to low temperatures by resonant effects. We outline how Langevin simulations can be employed for addressing the non-equilibrium momentum distribution of non-relativistic particles in a cosmological background. For a scalar singlet mass $m_{\phi }^{}\simeq 60$ GeV, these simulations suggest that kinetic equilibrium is a good approximation down to $T\sim 1$ GeV, with the deviation first manifesting itself as a red-tilted spectrum. This reduces the annihilation cross section, confirming findings from other methods that a somewhat larger ($<20\%$) coupling than in equilibrium is needed for obtaining the correct abundance.

   hep-phJCAP(2023)·6 citations
2. 02*

   PDFs determination from the LHeC

   Francesco Giuli🇨🇭

   Deep Inelastic Scattering would be brought into the unexplored TeV regime by the the proposed Large Hadron Electron Collider at CERN. Its rich physics program, includes both precision Standard Model measurements to complement LHC physics as well as studies of QCD in the high energy limit. The present proceeding reports on studies included in the updated LHeC Conceptual Design Report. We study the impact of LHeC simulated data on Parton Distribution Functions uncertainties. We also assess the LHeC potential to allow the determination of the strong coupling constant ${\alpha }_S$, at per-mille level as well as to disentangle between various scenarios of small-$x$ QCD.

   hep-phhep-exActa Phys.Polon.Supp.(2023)·0 citations
3. 03*

   Toward a complete description of $b\to u{\ell }^{-}\bar{\nu }$ decays within the Weak Effective Theory

   Domagoj Leljak🇭🇷 · Blaženka Melić🇭🇷 · Filip Novak🇩🇪 · Méril Reboud🇬🇧 · Danny van Dyk🇬🇧

   We fit the available data on exclusive semileptonic $b\to u{\ell }^{-}\bar{\nu }$ decays within the Standard Model and in the Weak Effective Theory. Assuming Standard Model dynamics, we find $|V_{ub}|=3.59_{-0.12}^{+0.13}\times 10^{-3}$. Lifting this assumption, we obtain stringent constraints on the coefficients of the $ub\ell \nu$ sector of the Weak Effective Theory. Performing a Bayesian model comparison, we find that a beyond the Standard Model interpretation is favoured over a Standard Model interpretation of the available data. We provide a Gaussian mixture model that enables the efficient use of our fit results in subsequent analyses beyond the Standard Model, within and beyond the framework of the Standard Model Effective Field Theory.

   hep-phJHEP(2023)·17 citations
4. 04*

   Neutrino oscillations in astrophysical environment accounting for neutrino charge radius and anapole moment

   Vadim Shakhov🇷🇺 · Alexander Studenikin🇷🇺

   We derive an effective neutrino evolution Hamiltonian and corresponding expression for neutrino spin oscillations probabilities accounting for neutrino interactions with external electric current due to neutrino charge radii and anapole moment. The results are interesting for possible applications in astrophysics.

   hep-ph0 citations
5. 05*

   Elastic neutrino-atom scattering as a probe of neutrino millicharge and magnetic moment

   Georgy Donchenko🇷🇺 · Konstantin Kouzakov🇷🇺 · Alexander Studenikin🇷🇺

   Neutrino scattering on atomic systems at low-energy transfer is a powerful tool for searching the neutrino electromagnetic interactions. The regime of coherent elastic neutrino-atom scattering, i.e., when the atom recoils as a pointlike particle, can be effectively fulfilled in the case of tritium antineutrinos. We present theoretical calculations for coherent elastic neutrino-atom scattering processes on such targets as the H, ${}^2$H, ${}^3$He, and ${}^4$He %, and ${}^{12}$C atoms. We show how the atomic effects and neutrino electromagnetic properties, namely the neutrino millicharge and magnetic moment, may manifest themselves in the atomic-recoil spectra. Our results can be used in planning the experiments on coherent elastic neutrino-atom scattering (in particular, with superfluid He-4).

   hep-phJETP Lett.(2023)·5 citations
6. 06*

   A proposal for experiment with high-intensity tritium neutrino source in Sarov: The search for coherent elastic neutrino-atom scattering and neutrino magnetic moment

   Matteo Cadeddu🇮🇹 · Georgy Donchenko🇷🇺 · Francesca Dordei🇮🇹 · Carlo Giunti🇮🇹 · Konstantin Kouzakov🇷🇺 · Bayarto Lubsandorzhiev🇷🇺 · Alexander Studenikin🇷🇺 · Vladimir Trofimov🇷🇺 · Maxim Vyalkov🇷🇺 · Arkady Yukhimchuk🇷🇺

   A description of the current state of the project for the study of coherent elastic neutrino-atom scattering using a tritium source and liquid helium detector is given. The project was proposed in our paper in 2019 and its main goal is to obtain a new record limit on the neutrino magnetic moment at a level below 10^{-12}\mu_B using a tritium antineutrino source with an intensity of 10 MCi or even 40 MCi.

   hep-phhep-ex6 citations
7. 07*

   Elastic neutrino scattering on nuclear systems as a probe of neutrino electromagnetic interactions

   Konstantin Kouzakov🇷🇺 · Fedor Lazarev🇷🇺 · Alexander Studenikin🇷🇺

   We study the electromagnetic contribution to elastic neutrino-proton and neutrino-neutron scattering processes. The neutrino electromagnetic charge, magnetic, electric, and anapole form factors of both diagonal and transition types in the mass basis are taken into account in the present formalism. When treating the nucleon electromagnetic vertex, we take into account not only the charge and magnetic form factors of a nucleon, but also its electric and anapole form factors. We examine how the effects of the neutrino magnetic moment can be disentangled from those of the strange quark contributions to the nucleon weak neutral current form factors.

   hep-ph0 citations
8. 08*

   Discovering Sparse Representations of Lie Groups with Machine Learning

   Roy T. Forestano🇺🇸 · Konstantin T. Matchev🇺🇸 · Katia Matcheva🇺🇸 · Alexander Roman🇺🇸 · Eyup B. Unlu🇺🇸 · Sarunas Verner🇺🇸

   Recent work has used deep learning to derive symmetry transformations, which preserve conserved quantities, and to obtain the corresponding algebras of generators. In this letter, we extend this technique to derive sparse representations of arbitrary Lie algebras. We show that our method reproduces the canonical (sparse) representations of the generators of the Lorentz group, as well as the $U(n)$ and $SU(n)$ families of Lie groups. This approach is completely general and can be used to find the infinitesimal generators for any Lie group.

   hep-phcs.LGmath-phmath.GR+1PLB(2023)·11 citations
9. 09*

   Unbinned Profiled Unfolding

   Jay Chan🇺🇸 · Benjamin Nachman🇺🇸

   Unfolding is an important procedure in particle physics experiments which corrects for detector effects and provides differential cross section measurements that can be used for a number of downstream tasks, such as extracting fundamental physics parameters. Traditionally, unfolding is done by discretizing the target phase space into a finite number of bins and is limited in the number of unfolded variables. Recently, there have been a number of proposals to perform unbinned unfolding with machine learning. However, none of these methods (like most unfolding methods) allow for simultaneously constraining (profiling) nuisance parameters. We propose a new machine learning-based unfolding method that results in an unbinned differential cross section and can profile nuisance parameters. The machine learning loss function is the full likelihood function, based on binned inputs at detector-level. We first demonstrate the method with simple Gaussian examples and then show the impact on a simulated Higgs boson cross section measurement.

   hep-phhep-exphysics.data-anstat.MLPRD(2023)·20 citations
10. 10*

    Combining QED and QCD transverse-momentum resummation for W and Z boson production at hadron colliders

    Andrea Autieri🇪🇸 · Leandro Cieri🇪🇸 · Giancarlo Ferrera🇮🇹 · German F. R. Sborlini🇪🇸

    In this article, we consider the transverse momentum ($q_T$) distribution of $W$ and $Z$ bosons produced in hadronic collisions. We combine the $q_T$ resummation for QED and QCD radiation including the QED soft emissions from the $W$ boson in the final state. In particular, we perform the resummation of enhanced logarithmic contributions due to soft and collinear emissions at next-to-leading accuracy in QED, leading-order accuracy for mixed QED-QCD and next-to-next-to-leading accuracy in QCD. In the small-$q_T$ region we consistently include in our results the next-to-next-to-leading order (i.e.\ two loops) QCD corrections and the next-to-leading order (i.e.\ one loop) electroweak corrections. The matching with the fixed-order calculation at large $q_T$ has been performed at next-to-leading order in QCD (i.e.\ at $\mathcal{O}({\alpha }_S^2)$) and at leading order in QED. We show numerical results for $W$ and $Z$ production at the Tevatron and the LHC. Finally, we consider the effect of combined QCD and QED resummation for the ratio of $W$ and $Z$ $q_T$ distributions, and we study the impact of the QED corrections providing an estimate of the corresponding perturbative uncertainties.

    hep-phhep-exJHEP(2023)·17 citations
11. 11*

    Semi-Visible Dark Photon Phenomenology at the GeV Scale

    Asli M. Abdullahi🇺🇸 · Matheus Hostert🇬🇧 · Daniele Massaro🇮🇹 · Silvia Pascoli🇮🇹

    In rich dark sector models, dark photons heavier than tens of MeV can behave as semi-visible particles: their decays contain both visible and invisible final states. We present models containing multiple dark fermions which allow for such decays and inscribe them in the context of inelastic dark matter and heavy neutral leptons scenarios. Our models represent a generalization of the traditional inelastic dark matter model by means of a charge conjugation symmetry. We revisit constraints on dark photons from $e^{+}{e}^{-}$ colliders and fixed target experiments, including the effect of analysis vetoes on semi-visible decays, $A^{\prime }\to {\psi }_i({\psi }_j\to {\psi }_k{\ell }^{+}{\ell }^{-})$. We find that in some cases, the BaBar and NA64 experiments no longer exclude large kinetic mixing, $\epsilon \sim 10^{-2}$, and, specifically, the related explanation of the discrepancy in the muon $(g-2)$. This reopens an interesting window in parameter space for dark photons with exciting discovery prospects. We point out that a modified missing-energy search at NA64 can target short-lived $A^{\prime }$ decays and directly probe the newly-open parameter space.

    hep-phhep-exPRD(2023)·36 citations
12. 12*

    Constraining Light Thermal Inelastic Dark Matter with NA64

    Martina Mongillo🇨🇭 · Asli Abdullahi🇺🇸 · Benjamin Banto Oberhauser🇨🇭 · Paolo Crivelli🇨🇭 · Matheus Hostert🇬🇧 · Daniele Massaro🇮🇹 · Laura Molina Bueno🇪🇸 · Silvia Pascoli🇮🇹

    A vector portal between the Standard Model and the dark sector is a predictive and compelling framework for thermal dark matter. Through co-annihilations, models of inelastic dark matter (iDM) and inelastic Dirac dark matter (i2DM) can reproduce the observed relic density in the MeV to GeV mass range without violating cosmological limits. In these scenarios, the vector mediator behaves like a semi-visible particle, evading traditional bounds on visible or invisible resonances, and uncovering new parameter space to explain the muon $(g-2)$ anomaly. By means of a more inclusive signal definition at the NA64 experiment, we place new constraints on iDM and i2DM using a missing energy technique. With a recast-based analysis, we contextualize the NA64 exclusion limits in parameter space and estimate the reach of the newly collected and expected future NA64 data. Our results motivate the development of an optimized search program for semi-visible particles, in which fixed-target experiments like NA64 provide a powerful probe in the sub-GeV mass range.

    hep-phhep-exEPJC(2023)·33 citations
13. 13*

    Isospin-violating dark matter at liquid noble detectors: new constraints, future projections, and an exploration of target complementarity

    Andrew Cheek🇵🇱 · Darren D. Price🇬🇧 · Ellen M. Sandford🇬🇧

    There is no known reason that dark matter interactions with the Standard Model should couple to neutrons and protons in the same way. This isospin violation can have large consequences, modifying the sensitivity of existing and future direct detection experimental constraints by orders of magnitude. Previous works in the literature have focused on the zero-momentum limit which has its limitations when extending the analysis to the Non-Relativistic Effective Field Theory basis (NREFT). In this paper, we study isospin violation in a detailed manner, paying specific attention to the experimental setups of liquid noble detectors. We analyse two effective Standard Model gauge invariant models as interesting case studies as well as the more model-independent NREFT operators. This work demonstrates the high degree of complementarity between the target nuclei xenon and argon. Most notably, we show that the Standard Model gauge-invariant formulation of the standard spin-dependent interaction often generates a sizeable response from argon, a target nuclei with zero spin. This work is meant as an update and a useful reference to model builders and experimentalists.

    hep-phhep-exEPJC(2023)·9 citations
14. 14*

    Leptoquark search at the Forward Physics Facility

    Kingman Cheung🇹🇼 · Thong T. Q. Nguyen🇹🇼 · C. J. Ouseph🇹🇼

    In this study, we calculate the sensitivity reach on the vector leptoquark (LQ) $U_1$ at the experiments proposed in Forward Physics Facility (FPF), including FASER$\nu$, FASER$\nu 2$, FLArE (10 tons), and FLArE (100 tons) using the neutrino-nucleon scattering ($\nu N\to \nu N^{\prime }$ and $\nu N\to l{N}^{\prime }$). We cover a wide mass range of $10^{-3}$ GeV $\le M_{LQ}\le 10^4$ GeV. The new result shows that the FLArE (100 tons) offers the best sensitivity to the LQ model. The sensitivity curves for all the experiments follow a similar pattern with weakened sensitivities with the increment of the LQ mass. We combine the sensitivities obtained from the neutral- and charged-current interactions of the neutrinos.

    hep-phhep-exPRD(2023)·11 citations
15. 15*

    ${\tau }^{\pm }\nu \gamma \gamma$ and ${\ell }^{\pm }{\ell }^{\pm }\gamma \gamma \text{/}{E}_{T}X$ to probe the fermiophobic Higgs boson with high cutoff scales

    Jinheung Kim🇰🇷 · Soojin Lee🇰🇷 · Prasenjit Sanyal🇰🇷 · Jeonghyeon Song🇰🇷 · Daohan Wang🇰🇷

    The light fermiophobic Higgs boson $h_{\mathrm{f}}$ in the type-I two-Higgs-doublet model can evade the current search programs at the LHC since its production through the quark-antiquark annihilation and gluon fusion is not feasible. The particle can be more elusive if the model retains stability up to the Planck scale because the efficient discovery channels are missing from the existing search chart. Through the comprehensive scanning, we show that all the viable parameter points with the Planck cutoff scale require $m_{h_{\mathrm{f}}}\in [80,120]\mathrm{GeV}$ and $M_{A/H^{\pm }}\in [90,150]\mathrm{GeV}$. Since $h_{\mathrm{f}}{h}_{\mathrm{f}}\to \gamma \gamma W^{+}{W}^{-}$ and $H^{\pm }\to {\tau }^{\pm }\nu /h_{\mathrm{f}}{W}^{\pm }$ are dominant in this case, two final states are more efficient to probe $h_{\mathrm{f}}$ than the conventional search mode of $4\gamma +W^{\pm }/Z$. One is ${\tau }^{\pm }\nu \gamma \gamma$ from $pp\to H^{\pm }(\to {\tau }^{\pm }\nu )h_{\mathrm{f}}(\to \gamma \gamma )$ and the other is ${\ell }^{\pm }{\ell }^{\pm }\gamma \gamma \text{/}{E}_{T}X$ (${\ell }^{\pm }=e^{\pm },{\mu }^{\pm }$) from $pp\to H^{\pm }(\to h_{\mathrm{f}}{W}^{\pm })h_{\mathrm{f}}\to \gamma \gamma W^{+}{W}^{-}{W}^{\pm }$, $pp\to H^{\pm }(\to h_{\mathrm{f}}{W}^{\pm })A(\to h_{\mathrm{f}}Z)\to \gamma \gamma W^{+}{W}^{-}{W}^{\pm }Z$, and $pp\to H^{+}(\to h_{\mathrm{f}}{W}^{+})H^{-}(\to h_{\mathrm{f}}{W}^{-})\to \gamma \gamma W^{+}{W}^{-}{W}^{+}{W}^{-}$. The inclusive ${\ell }^{\pm }{\ell }^{\pm }\gamma \gamma \text{/}{E}_{T}X$ consists of a same-sign dilepton, two prompt photons, and missing transverse energy. We perform the signal-background analysis at the detector level. With the total integrated luminosity of $300{\mathrm{fb}}^{-1}$ and the 5\% background uncertainty, two proposed channels at the 14 TeV LHC yield signal significances above five in the entire viable parameter space of the fermiophobic type-I with a high cutoff scale.

    hep-phhep-exJHEP(2023)·10 citations
16. 16*

    Neutrino mixing angle and neutrino oscillation in ALPs matter

    Alexey Lichkunov🇷🇺 · Alexander Studenikin🇷🇺

    Axions and axion-like particles (ALPs) are among of the most popular candidates for dark matter. Axions are also considered as new physics contributions to the muon g-2. Following the existed interest to ALPs we consider interaction between neutrinos and hypothetical axion-like particles and derive for the first time the probability of neutrino oscillations accounting for their interactions mediated by ALPs. The corresponding effective mixing angle is derived.

    hep-ph2 citations
17. 17*

    Neutrino propagation in moving and polarized matter

    Alexander Grigoriev🇷🇺 · Alexander Studenikin🇷🇺 · Alexei Ternov🇷🇺

    The rapid development of neutrino astronomy, which is expressed, among other things, in the emergence of new neutrino mega-projects capable of efficient registering astrophysical neutrino fluxes requires a detailed knowledge of neutrino evolution inside neutrino sources (type II supernovae, gamma-ray bursts). This evolution can be influenced by many factors, each should be accounted for by a relevant theory. In this work, we develop the theory of neutrino propagation in moving and/or polarized matter by introducing for the first time an exact spin integral of motion. This enables us to obtain the neutrino dispersion under these conditions and resolve it for most important cases. Our approach opens up the possibility to consistently classify neutrino states in moving and/or polarized medium and, as a consequence, to give a systematic description of the related physical phenomena (e.g., neutrino oscillations, neutrino electromagnetic radiation).

    hep-ph0 citations
18. 18*

    Model-independent Odderon results based on TOTEM data on elastic proton-proton scattering at 8 TeV

    T. Csörgő ((1) and (2))🇭🇺 · T. Novák (2)🇭🇺 · R. Pasechnik (3)🇸🇪 · A. Ster (1)🇭🇺 · I. Szanyi (1, 2 and 4) ((1) Wigner RCP, Budapest, Hungary, (2) MATE Institute of Technology KRC, Gyöngyös, Hungary, (3) University of Lund, Lund, Sweden and (4) Eötvös University, Budapest, Hungary)🇭🇺

    We complete the model-independent analysis of the scaling properties of the differential cross section of elastic proton-proton cross sections, including new TOTEM data published in 2022 at $\sqrt{s}=8$ TeV. We separate the signal and the background region with a new gating method. In the signal region, we find that the statistical significance of Odderon exchange from the combined 7.0 and 8.0 TeV $pp$ data of TOTEM and the 1.96 TeV $p\bar{p}$ data of D0 is at least 7.32$\sigma$. In the background region, the scaling functions of elastic proton-proton data at 7 and 8 TeV and that of elastic proton-antiproton scattering data at 1.96 TeV agree with a statistical significance not larger than 1.93$\sigma$.

    ↳ hep-exhep-phnucl-exnucl-thActa Phys.Polon.Supp.(2023)·2 citations
19. 19*

    Emergent axion response in multilayered metamaterials

    Leon Shaposhnikov🇷🇺 · Maxim Mazanov🇷🇺 · Daniel A. Bobylev🇷🇺 · Frank Wilczek🇸🇪 · Maxim A. Gorlach🇷🇺

    We consider the design of metamaterials whose behavior embodies the equations of axion electrodynamics. We derive an effective medium description of an assembly of magneto-optical layers with out-of-plane magnetization analytically and show how to achieve effective axion response with tunable parameters. We display some key predictions and validate them numerically.

    ↳ physics.opticscond-mat.mes-hallhep-phPRB(2023)·23 citations
20. 20*

    The influence of the effective number of active and sterile neutrinos on the determination of the values of cosmological parameters

    P.A. Chernikov🇷🇺 · A.V. Ivanchik🇷🇺

    In the presented work we consider the influence of a hypothetical sterile neutrino (with eV-scale mass) on the determination of cosmological parameters. If it is detected, it will be necessary to include it into the $\Lambda \mathrm{CDM}$ model with the fixed values of its mass $m_{\mathrm{s}}$ and mixing angle ${\theta }_s$, which is the main method used through this paper. Apart from that, the seesaw mechanism requires there to be at least two sterile states, one of them being much heavier than the active ones. The heavier sterile state ($m_s\sim 1$ keV) would decay and increase the effective number of active neutrinos. Therefore, the influence of a change in the effective number of relativistic neutrino species $N_{\mathrm{eff}}$ was studied as well, which could be caused by, for example, the decay processes of the above-mentioned sterile neutrinos, as well as processes leading to an increase in the temperature of relic neutrinos $T_{\mathrm{C}\nu \mathrm{B}}$. The effects studied in this work lead to a significant change in the estimates of the cosmological parameters, including the value of $H_0$. It has been discovered that the accounting of the sterile neutrino with masses $m=1$ and $2.7$ eV leads to a decrease in the estimate of the current Hubble parameter value $H_0$ and, therefore, exacerbates the ``$H_0$-tension'' problem. An increase in the value of the effective number of relativistic neutrino species leads, on the contrary, to an increase in the $H_0$ estimate, resolving the above-mentioned problem at $N_{\mathrm{eff}}=3.0+0.9$, which is equivalent to an increase of the neutrino temperature up to $T_{\mathrm{C}\nu \mathrm{B}}^0=1.95+0.14\mathrm{K}$. At the same time, the rest of the cosmological parameters do not change significantly, leaving us within the framework of the standard $\Lambda \mathrm{CDM}$ model.

    ↳ astro-ph.COhep-phAstron.Lett.(2022)·9 citations
21. 21*

    Correlations Between Neutrinoless Double-Beta, Double Gamow-Teller and Double-Magnetic Decays in the pnQRPA Framework

    Lotta Jokiniemi🇨🇦 · Javier Menéndez🇪🇸

    We explore the relation between the nuclear matrix elements of neutrinoless double-beta ($0\nu \beta \beta$) decay and two other processes: double Gamow-Teller (DGT) and double-magnetic dipole (M1M1) transitions, with focus on medium-mass to heavy nuclei studied with the proton-neutron quasiparticle random-phase approximation (pnQRPA) framework. We explore a wide span of isoscalar proton-neutron pairing strengths covering the typical range of values that describe well $\beta$- and two-neutrino $\beta \beta$-decay data. Our results indicate good linear correlations between $0\nu \beta \beta$ and both DGT and M1M1 matrix elements. Together with future measurements of DGT and M1M1 transitions, these correlations could help constrain the values of the $0\nu \beta \beta$-decay nuclear matrix elements.

    ↳ nucl-thhep-exhep-phnucl-exPRC(2023)·18 citations
22. 22*

    Study of the Ultraviolet Behavior of an O($N$) $|\vec{\varphi }{|}^6$ Theory in $d=3$ Dimensions

    Robert Shrock🇺🇸

    We study the ultraviolet (UV) behavior of an O($N$) $|\vec{\varphi }{|}^6$ theory in $d=3$ spacetime dimensions, focusing on the question of the range in $N$ over which the perturbative beta function exhibits robust evidence of a UV zero in the $|\vec{\varphi }{|}^6$ coupling, $g$. The four-loop $(4\ell )$ beta function is known to have a (scheme-independent) UV zero at $g=g_{{}_{UV,4\ell }}$, which is reliably calculable for large $N$. For our analysis we use the six-loop beta function calculated in the minimal subtraction scheme. We find that this six-loop beta function has a UV zero, $g_{{}_{UV,6\ell }}$, if $N>N_c$, where $N_c\simeq 796$, and we calculate $g_{{}_{UV,6\ell }}$. To investigate the reliability of the result in the region of $N\gtrsim N_c$, we apply three methods: (i) calculation of the fractional difference between $g_{{}_{UV,4\ell }}$ and $g_{{}_{UV,6\ell }}$, (ii) a Padé approximant, and (iii) an assessment of scheme dependence. Our results provide quantitative measures of the range of $N$ over which the six-loop beta function has a UV zero and of the $1/N$ corrections to the value of $g$ at the UV zero for large but finite $N$. If one imposes a benchmark requirement that the fractional difference between $g_{{}_{UV,4\ell }}$ and $g_{{}_{UV,6\ell }}$ must be less than 15 \%, then our results show that this requirement is satisfied for $N\gtrsim 2\times 10^3$. The possible role of nonperturbative effects is also noted.

    ↳ hep-thhep-phPRD(2023)·5 citations
23. 23*

    Supergravity Scattering Amplitudes

    Emilian Dudas🇫🇷 · Tony Gherghetta🇺🇸 · Keith A. Olive🇺🇸 · Sarunas Verner🇺🇸

    Supergravity theories with non-minimal Kähler potentials are characterized by a non-trivial field space manifold with corresponding non-trivial kinetic terms. The scattering amplitudes in these theories can be calculated at fixed background field values by making a field redefinition to Riemann normal coordinates. Because of the Kähler structure of supergravity, a more compact method for calculating amplitudes is obtained by a redefinition to Kähler normal coordinates. We compare both methods and calculate the explicit transformations and amplitudes for several examples in the context of no-scale supergravity with one and two chiral superfields. We show that in all cases the equivalence of the scattering amplitudes using either Riemann normal or Kähler normal coordinates is possible only at extremal points of the scalar potential.

    ↳ hep-thhep-phPRD(2023)·3 citations
24. 24*

    Limits on Neutrino Emission from GRB 221009A from MeV to PeV using the IceCube Neutrino Observatory

    R. Abbasi · M. Ackermann · J. Adams · S. K. Agarwalla · N. Aggarwal · J. A. Aguilar · M. Ahlers · J.M. Alameddine · N. M. Amin · K. Andeen · G. Anton · C. Argüelles and 375 other authors

    Gamma-ray bursts (GRBs) have long been considered a possible source of high-energy neutrinos. While no correlations have yet been detected between high-energy neutrinos and GRBs, the recent observation of GRB 221009A - the brightest GRB observed by Fermi-GBM to date and the first one to be observed above an energy of 10 TeV - provides a unique opportunity to test for hadronic emission. In this paper, we leverage the wide energy range of the IceCube Neutrino Observatory to search for neutrinos from GRB 221009A. We find no significant deviation from background expectation across event samples ranging from MeV to PeV energies, placing stringent upper limits on the neutrino emission from this source.

    ↳ astro-ph.HEhep-exhep-phApJL(2023)·80 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.