Mon·Aug 7, 2023Monday·August 7, 2023

1. 01*

   Proton helicity structure function g_1^p from a holographic Pomeron

   Ignacio Borsa🇦🇷 · David Jorrin🇦🇷 · Rodolfo Sassot🇦🇷 · Martin Schvellinger🇦🇷

   We present a detailed analysis of the polarized and the unpolarized deep inelastic scattering structure functions of the proton, g_1^p and F_2^p respectively, in the context of a holographic dual description based on type IIB superstring theory. We compare this description with experimental data and Quantum Chromodynamics estimates computed at leading, next-to-leading and next-to-next-to-leading order in perturbation. We confront the predictions of a holographic dual model and those of perturbative QCD for g_1^p at the kinematics that will be probed by the forthcoming Electron-Ion Collider. We find that the extrapolation of g_1^p to very small values the Bjorken variable computed with a Holographic Pomeron model based on actual data at higher momentum fractions is always positive and differs significantly with standard projections based on perturbative QCD.

   hep-phhep-thPRD(2023)·11 citations
2. 02*

   The Quest for the Nature of the Dark Matter: The Need of a New Paradigm

   Fabrizio Nesti🇮🇹 · Paolo Salucci🇮🇹 · Nicola Turini🇮🇹

   The phenomenon of the Dark matter baffles the researchers: the underlying dark particle has escaped so far the detection and its astrophysical role appears complex and entangled with that of the standard luminous particles. We propose that, in order to act efficiently, alongside with abandoning the current $\Lambda CDM$ scenario, we need also to shift the Paradigm from which it emerged.

   hep-phastro-ph.COAstronomy(2023)·16 citations
3. 03*

   Sommerfeld enhancement for puffy self-interacting dark matter

   Wenyu Wang🇨🇳 · Wu-Long Xu🇨🇳 · Jin Min Yang🇨🇳 · Bin Zhu🇨🇳 · Rui Zhu🇨🇳

   We examine the Sommerfeld enhancement effect for the puffy self-interacting dark matter. We find out two new parameters to classify the self-scattering cross section into the Born, the resonance and the classical regimes for the puffy dark matter. Then we observe that the resonance peaks for the puffy dark matter self-scattering and for the Sommerfeld enhancement effect have the same locations. Further, we find that for a large ratio between $R_{\chi }$ (radius of a puffy dark matter particle) and $1/m_{\varphi }$ (force range), the Sommerfeld enhancement factor approaches to 1 (no enhancement). Finally, for the puffy SIDM scenario to solve the small-scale problems, the values of the Sommerfeld enhancement factor are displayed in the allowed parameter regions.

   hep-phastro-ph.HEhep-thJHEP(2024)·5 citations
4. 04*

   An Improved Bound on Accelerated Light Dark Matter

   Liangliang Su🇨🇳 · Lei Wu🇨🇳 · Bin Zhu🇨🇳

   Light (sub-GeV) dark matter has gained increasing interest in terms of direct detection. Accelerated dark matter is a promising candidate that can generate detectable nuclear recoil energy within the sub-GeV range. Because of the large kinetic energy, its interactions with the nucleus are predominantly governed by inelastic scattering, including quasi-elastic and deep inelastic scattering. In this work, we calculated the inelastic effects in dark matter--Earth scattering mediated by a vector particle. Our analysis revealed that the impact of inelastic scattering relies on the mediator mass and the kinetic energy spectrum of dark matter. The results exhibited considerable disparity: the upper bounds of the exclusion limit for the spin-independent cross-section between accelerated dark matter and nuclei via a heavy mediator differ by several tens of times when inelastic scattering is considered.

   hep-phhep-exSCPMA(2024)·26 citations
5. 05*

   A possible search for Majorana neutrinos at future lepton colliders

   E. Antonov🇷🇺 · A. Drutskoy🇷🇺 · M. Dubinin🇷🇺

   We discuss the process ${\ell }^{+}{\ell }^{-}\to N{W}^{\pm }{\ell }^{\mp }$, where $N$ is a heavy Majorana neutrino and $\ell =e,\mu$. Large cross sections are expected for these processes at high center-of-mass energies, which can be reached at future lepton-lepton colliders. The Monte Carlo simulation of the studied processes is produced within the framework of the seesaw type-I model, where the Majorana neutrinos (or heavy neutral leptons, HNL), are introduced in the standard leptonic sector. Recently the possibility to search for the direct HNL production was studied in the ${\ell }^{+}{\ell }^{-}\to N{\nu }_{\ell }$ process with the subsequent decay $N\to W^{\pm }{\ell }^{\mp }$. In this paper we investigate an alternative process ${\ell }^{+}{\ell }^{-}\to N{W}^{\pm }{\ell }^{\mp }\to W^{\pm }{W}^{\pm }{\ell }^{\mp }{\ell }^{\mp }$ with the lepton number violation by two units. The similar processes appear in collisions with the same-sign beams, $e^{-}{e}^{-}\to N{W}^{-}{e}^{-}\to W^{-}{W}^{-}{e}^{+}{e}^{-}$ or ${\mu }^{+}{\mu }^{+}\to N{W}^{+}{\mu }^{+}\to W^{+}{W}^{+}{\mu }^{+}{\mu }^{-}$. The cross sections of the processes under consideration are enhanced by the soft photon exchange in the $t$-channel. We calculate the cross sections for the signals and potential Standard Model backgrounds for the $e^{+}{e}^{-}$ beam collisions at the 1 TeV center-of-mass energy and the ${\mu }^{+}{\mu }^{-}$ collisions at 3 TeV and 10 TeV. Due to the diagrams with soft $t$-channel photons and respective interference the promptly emitted leptons are produced in the direction close to the corresponding beam. These leptons will be lost in the beam pipe or badly measured by forward detectors. However, the signal events can be well separated from backgrounds using the rest of the event containing the $WW\ell$ particles. Finally, the expected upper limits on the mixing parameters $|V_{\ell N}{|}^2$ as a function of M($N$) are calculated.

   hep-phhep-exJETP Lett.(2023)·6 citations
6. 06*

   Estimates of the isospin-violating ${\Lambda }_b\to {\Sigma }^0\varphi ,{\Sigma }^{0}J/\psi$ decays and the $\Sigma -\Lambda$ mixing

   Zhou Rui🇨🇳 · Jia-Ming Li🇨🇳 · Chao-Qi Zhang🇨🇳

   We analyse the two purely isospin-violating decays ${\Lambda }_b\to {\Sigma }^0\varphi$ and ${\Lambda }_b\to {\Sigma }^{0}J/\psi$, proceed merely via the exchange topologies, in the framework of perturbative QCD approach. Assuming ${\Sigma }^0$ baryon belongs to the idealized isospin triplet with quark components of $usd$, the branching ratios of the two decay modes are predicted to be tiny, of the order $10^{-8}-10^{-9}$, leading to a difficulty in observing them. We then extend our study to include the $\Sigma -\Lambda$ mixing.It is found that the mixing has significant effect on the ${\Lambda }_b\to \Sigma$ decays, especially it can greatly increase the rate of the $J/\psi$ process, by as much as two orders of magnitude, yield $10^{-7}$, which should be searchable in the future. We also estimate a set of asymmetry observables with and without the mixing effect, which will be tested in coming experiments.

   hep-phhep-exPRD(2023)·3 citations
7. 07*

   The decay property of the $X(3842)$ as the ${\psi }_{{}_3}(1^3{D}_{{}_3})$ state

   Wei Li🇨🇳 · Su-Yan Pei🇨🇳 · Tianhong Wang🇨🇳 · Tai-Fu Feng🇨🇳 · Guo-Li Wang🇨🇳

   In this paper, the new particle $X(3842)$ discovered by the LHCb Collaboration is identified to be the ${\psi }_{{}_3}(1^3{D}_{{}_3})$ state. We study its strong decays with the combination of the Bethe-Salpeter method and the ${}^3{P}_{{}_0}$ model. Its electromagnetic (EM) decay is also calculated by the Bethe-Salpeter method within Mandelstam formalism. The strong decay widths are {$\Gamma [X(3842)\to D^0{\bar{D}}^0]=1.28$ MeV}, $\Gamma [X(3823)\to D^{+}{D}^{-}]=1.08$ MeV, and the ratio $\mathcal{B}[X(3842)\to D^{+}{D}^{-}]/\mathcal{B}[X(3823)\to D^0{\bar{D}}^0]=0.84$. The EM decay width is $\Gamma [X(3842)\to {\chi }_{{}_{c2}}\gamma ]=0.29$ MeV. We also estimate the total width to be 2.87 MeV, which is in good agreement with the experimental data $2.79_{-0.86}^{+0.86}$ MeV. Since the used relativistic wave functions include different partial waves, we also study the contributions of different partial waves in electromagnetic decay.

   hep-phPRD(2024)·8 citations
8. 08*

   Regge trajectories for the heavy-light diquarks

   Jiao-Kai Chen🇨🇳 · Xia Feng🇨🇳 · Jia-Qi Xie🇨🇳

   We attempt to apply the Regge trajectory approach to the heavy-light diquarks composed of one heavy quark and one light quark. However, we find that the direct application of the usual Regge trajectory formula for the heavy-light mesons and baryons fails. In order to correctly estimate the masses of the heavy-light diquarks, it is needed to consider the light quark mass correction and the parameter $C$ in the Cornell potential within the Regge trajectory formula. By using the modified Regge trajectory formulas, we are able to estimate the masses of the heavy-light diquarks $(cu)$, $(cs)$, $(bu)$ and $(bs)$, which agree with other theoretical results. It is illustrated that the heavy-light diquarks satisfy the universal descriptions irrespective of heavy quark flavors, similar to other heavy-light systems such as the heavy-light mesons, the heavy-light baryons composed of one heavy quark (diquark) and one light diquark (quark), and the heavy-light tetraquarks composed of one heavy diquark (antidiquark) and one light antidiquark (diquark). The diquark Regge trajectory provides a new and very simple approach for estimating the spectra of the heavy-light diquarks.

   hep-phJHEP(2023)·19 citations
9. 09*

   New physics implications of VBF searches exemplified through the Georgi-Machacek model

   Manimala Chakraborti🇬🇧 · Dipankar Das🇮🇳 · Nivedita Ghosh🇮🇳 · Samadrita Mukherjee🇮🇳 · Ipsita Saha🇮🇳

   LHC searches for nonstandard scalars in vector boson fusion (VBF) production processes can be particularly efficient in probing scalars belonging to triplet or higher multiplet representations of the Standard Model $SU(2{)}_L$ gauge group. They can be especially relevant for models where the additional scalars do not have any tree-level couplings to the Standard Model fermions, rendering VBF as their primary production mode at the LHC. In this work, we employ the latest LHC data from VBF resonance searches to constrain the properties of nonstandard scalars, taking the Georgi-Machacek model as a prototypical example. We take into account the theoretical constraints on the potential from unitarity and boundedness-from-below as well as indirect constraints coming from the signal strength measurements of the 125 GeV Higgs boson at the LHC. To facilitate the phenomenological analysis we advocate a convenient reparametrization of the trilinear couplings in the scalar potential. We derive simple correlations among the model parameters corresponding to the decoupling limit of the model. We explicitly demonstrate how a combination of theoretical and phenomenological constraints can push the GM model towards the decoupling limit. Our analysis suggests that the VBF searches can provide key insights into the composition of the electroweak vacuum expectation value.

   hep-phhep-exPRD(2024)·14 citations
10. 10*

    Effects of odderon spin on helicity amplitudes in $pp$ elastic scattering

    Prin Sawasdipol🇹🇭 · Jingle B. Magallanes🇵🇭 · Chakrit Pongkitivanichkul🇹🇭 · Daris Samart🇹🇭

    In recent years, the discovery of the odderon, a colorless $C$-odd gluonic compound, has been confirmed in the TOTEM and D0 collaborations. However, the spin quantum number of the odderon remains unidentified. In this work, we aim to attribute a spin of $J=3$ to the odderon in $pp$ elastic scattering by calculating the helicity amplitudes and the corresponding complex parameter $r_5$, the ratio of helicity's single-flip to non-flip amplitudes, for the spin-3 tensor odderon with the standard spin-2 tensor pomeron exchanges. Then, we apply these results to the constraints obtained from the STAR experiment at RHIC. By comparing to the contributions of the spin-1 vector odderon and spin-2 tensor pomeron, we demonstrate that the spin-3 tensor odderon, i.e. $J=3$, provides a better explanation for the observable in $pp$ elastic scattering.

    hep-phnucl-thEPJC(2023)·2 citations
11. 11*

    Forward production of a Drell-Yan pair and a jet at small $x$ at next-to-leading order

    Pieter Taels🇧🇪

    We perform the analytical next-to-leading order calculation of the process $p+A\to {\gamma }^{\ast }+\mathrm{jet}+X$, at forward rapidities and low $x$. These kinematics justify a hybrid approach, where a quark from the \textquoteleft projectile' proton scatters off the gluon distribution of the \textquoteleft target', which can be a nucleus or a highly boosted proton. By using the Color Glass Condensate effective theory approach, this gluon distribution is allowed to be so dense that the quark undergoes multiple scattering. Moreover, large high-energy logarithms in the ratio of the hard scale and the center-of-mass energy are resummed by the Balitsky, Kovchegov, Jalilian-Marian, Iancu, McLerran, Weigert, Leonidov, Kovner or BK-JIMWLK evolution equations. We demonstrate that all ultraviolet divergences encountered in the calculation cancel, while the high-energy divergences are absorbed into BK-JIMWLK. The remaining singularities are collinear in nature and can be either absorbed into the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution of the incoming quark, when they stem from initial-state radiation, or else can be treated by introduction of a jet function in case they are caused by final-state emissions. The resulting cross section is completely finite and expressed in function of only a small set of color operators.

    hep-phJHEP(2024)·29 citations
12. 12*

    Precision Higgs Width and Couplings with a High Energy Muon Collider

    Matthew Forslund🇺🇸 · Patrick Meade🇺🇸

    The interpretation of Higgs data is typically based on different assumptions about whether there can be additional decay modes of the Higgs or if any couplings can be bounded by theoretical arguments. Going beyond these assumptions requires either a precision measurement of the Higgs width or an absolute measurement of a coupling to eliminate a flat direction in precision fits that occurs when $|g_{hVV}/g_{hVV}^{SM}|>1$, where $V=W^{\pm },Z$. In this paper we explore how well a high energy muon collider can test Higgs physics without having to make assumptions on the total width of the Higgs. In particular, we investigate off-shell methods for Higgs production used at the LHC and searches for invisible decays of the Higgs to see how powerful they are at a muon collider. We then investigate the theoretical requirements on a model which can exist in such a flat direction. Combining expected Higgs precision with other constraints, the most dangerous flat direction is described by generalized Georgi-Machacek models. We find that by combining direct searches with Higgs precision, a high energy muon collider can robustly test single Higgs precision down to the $\mathcal{O}(.1\%)$ level without having to assume SM Higgs decays. Furthermore, it allows one to bound new contributions to the width at the sub-percent level as well. Finally, we comment on how even in this difficult flat direction for Higgs precision, a muon collider can robustly test or discover new physics in multiple ways. Expanding beyond simple coupling modifiers/EFTs, there is a large region of parameter space that muon colliders can explore for EWSB that is not probed with only standard Higgs precision observables.

    hep-phJHEP(2024)·40 citations
13. 13*

    Comprehensive analysis on photon-electron Lorentz-violation parameter plane

    Ping He🇨🇳 · Bo-Qiang Ma🇨🇳

    Large High Altitude Air Shower Observatory~(LHAASO) opens the window of ultra-high-energy~(UHE) photon detection, broadens the path of testing basic physical concept such as Lorentz symmetry, and brings possibility of potential high-energy physical phenomenon research such as photon decay and electron decay. Currently, the UHE photons from LHAASO observation set strict constraints on photon and electron Lorentz symmetry violation~(LV) effects. To obtain a global impression of the photon-electron LV parameter plane, we make a detailed analysis for photon decay and electron decay. Our discussion gives the corresponding decay thresholds and energy-momentum distributions in different LV parameter configurations. We get corresponding constraints on photon LV parameter, electron LV parameter and the photon-electron LV parameter plane from LHAASO observation. For the space allowed for LV effect, that is beyond relativity, we also provide corresponding boundaries from LHAASO observation.

    ↳ astro-ph.HEgr-qchep-phPRD(2023)·5 citations
14. 14*

    Contrast Loss from Astrophysical Backgrounds in Space-Based Matter-Wave Interferometers

    Yufeng Du🇺🇸 · Clara Murgui🇺🇸 · Kris Pardo🇺🇸 · Yikun Wang🇺🇸 · Kathryn M. Zurek🇺🇸

    Atom and matter interferometers are precise quantum sensing experiments that can probe differential forces along separated spacetime paths. Various atom and matter interferometer experiments have been proposed to study dark matter, gravitational waves, and exotic new physics. Increasingly, these experimental concepts have proposed space-based designs to maximize interrogation times and baselines. However, decoherence and phase shifts caused by astrophysical backgrounds could largely undermine or destroy the target sensitivity of the experiments. We calculate the decoherence effects induced by solar photons, the solar wind, cosmic rays, solar neutrinos and zodiacal dust on space-based atom and matter interferometers. We find that, in future space-based atom and matter interferometers, the solar wind generically produces decoherence beyond the quantum noise limit, without proper shielding. In addition, solar photons are also an important background for matter interferometers.

    ↳ quant-phastro-ph.COhep-phphysics.atom-ph4 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.