Mon·Jan 10, 2022Monday·January 10, 2022

1. 01*

   Constraining dark matter-nucleon scattering cross section by the background electron anti-neutrino flux data

   Man Ho Chan🇨🇳 · Chak Man Lee🇨🇳

   Celestial objects such as stars and planets might be able to capture a large amount of dark matter particles through dark matter-nucleon scattering. Many previous studies have considered different celestial objects such as the Sun and the Earth as natural dark matter detectors and obtained some stringent bounds of the dark matter-nucleon scattering cross section. In this study, we use the $\sim 10$ MeV electron neutrino flux limits obtained by the Super-Kamiokande experiment and consider the Earth as a large natural dark matter detector to constrain the dark matter-nucleon scattering cross section. We show that this method can generally get more stringent limits. For certain ranges of dark matter mass annihilating via the $b\bar{b}$ channel, the limits of cross section for the isospin-independent scattering and proton-only scattering could be more stringent than that obtained in the PICO direct-detection experiment.

   hep-phastro-ph.EPastro-ph.HEPLB(2022)·7 citations
2. 02*

   Gravitational wave background from non-Abelian reheating after axion-like inflation

   P. Klose🇨🇭 · M. Laine🇨🇭 · S. Procacci🇨🇭

   A pseudoscalar inflaton $\phi$, coupled to the topological charge density $F\tilde{F}$ of a non-Abelian sector, can decay to gauge bosons ($\phi \to gg$), which may thermalize rapidly. The friction felt by $\phi$ is then increased by non-Abelian "strong sphalerons", leading to a self-amplifying process that can efficiently heat up the medium. We determine a lower bound for the gravitational wave production rate from such a process, originating via hydrodynamic fluctuations and particle collisions, in terms of a minimal number of parameters. Only a moderate fraction of energy density is converted to gravitational waves, suggesting that non-Abelian models may avoid the overproduction observed in some Abelian cases.

   hep-phastro-ph.COJCAP(2022)·48 citations
3. 03*

   The mass spectrum and wave functions of the $B_c$ system

   Guo-Li Wang🇨🇳 · Tianghong Wang🇨🇳 · Qiang Li🇨🇳 · Chao-Hsi Chang🇨🇳

   The spectrum and relativistic wave functions of $B_c$ system are investigated via solving the complete Salpeter equation. Emphases are put on the study of the partial waves of each $J^P$ state. Our study shows that there are three categories of $J^P$ states. The first category contains $0^{-}$ and $0^{+}$ states, which are ${}^1{S}_0$ dominant state with a small amount of $P$ wave and ${}^3{P}_0$ dominant state with a small amount of $S$ wave, respectively. The second category includes the natural parity states, such as $1^{-}$, $2^{+}$, $3^{-}$, etc. Taking the $1^{-}$ state as an example, we study it in two cases. One is the ${}^3{S}_1$ dominant state with a small amount of $P$ and $D$ waves, and the other is the ${}^3{D}_1$ dominant state but contains a large amount of $S$ and $P$ wave components. The third category includes the unnatural parity states, such as $1^{+}$, $2^{-}$, $3^{+}$, etc. For the $1^{+}$ spectrum, the states are grouped into pairs with different radial quantum numbers. Each pair contains two ${}^1{P}_1-{}^3{P}_1$ mixing states, and the corresponding mixing angles are calculated by using the relativistic wave functions.

   hep-phhep-exJHEP(2022)·37 citations
4. 04*

   Gravitational reheating

   Md Riajul Haque🇮🇳 · Debaprasad Maity🇮🇳

   Our present understanding of the reheating phase is incomplete due to a lack of observations. Apart from its cosmological implications, the reheating should play a vital role in particle physics and inflation model building. Conventionally reheating dynamics are modeled by invoking arbitrary coupling among the inflaton and daughter fields. Such an approach lacks robust cosmological predictions due to its arbitrary couplings and is difficult to verify through observation. In this paper, we propose a minimal reheating scenario where the inflaton is coupled with all the daughter fields only gravitationally. Besides being successful in reheating the Universe, the scenario offers a strong cosmological prediction of the primordial gravitational wave spectrum and discards a large number of possible models of dark matter and inflation that are otherwise consistent with Planck.

   hep-phastro-ph.COgr-qchep-thPRD(2023)·90 citations
5. 05*

   On the exclusion limits in $t\bar{t}+$DM searches at the LHC

   Jonathan Hermann🇩🇪

   In these proceedings we discuss the importance of higher-order corrections and off-shell effects for the calculation of signal strength exclusion limits in $t\bar{t}+$DM searches at the Large Hadron Collider. We present limits for the spin-0 s-channel mediator model using state-of-the-art NLO QCD predictions with full off-shell effects for the relevant $t\bar{t}$ and $t\bar{t}Z$ background processes. These are then compared to less sophisticated predictions using either the narrow-width approximation or LO calculations in order to asses the respective effects.

   hep-ph1 citation
6. 06*

   Direct $CP$ violation of three bodies decay process from the resonance effect

   Gang Lü🇨🇳 · Yan-Lin Zhao🇨🇳 · Liang-Chen Liu🇨🇳 · Xin-Heng Guo🇨🇳

   The physical state of $\rho$-$\omega$-$\varphi$ mesons can be mixed by the unitary matrix. The decay processes of $\omega \to {\pi }^{+}{\pi }^{-}$ and $\varphi \to {\pi }^{+}{\pi }^{-}$ are from the isospin symmetry breaking. The $\rho -\omega$, $\rho -\varphi$ and $\omega -\varphi$ interferences lead to resonance contribution to produce the strong phases. The $CP$ asymmetry is considered from above isospin symmetry breaking due to the new strong phase for the first order. It has been found the $CP$ asymmetry can be enhanced greatly for the decay process of $B^0\to {\pi }^{+}{\pi }^{-}{\eta }^{{(}^{\prime })}$ when the invariant masses of the ${\pi }^{+}{\pi }^{-}$ pairs are in the area around the $\omega$ resonance range and the $\varphi$ resonance range in perturbative QCD. We also discuss the possibility to search the predicted $CP$ violation at the LHC.

   hep-phCPC(2022)·9 citations
7. 07*

   Exploring neutrinos from proton decays catalyzed by GUT monopoles in the Sun

   Hang Hu🇨🇳 · Jie Cheng🇨🇳 · Wan-Lei Guo🇨🇳 · Wei Wang🇨🇳

   We explore the neutrino signals from proton decays catalyzed by GUT monopoles in the Sun. Three typical proton decay modes, $p\to e^{+}+({\rho }^0,\eta ,\omega ...)\to {\pi }^{+}$, $p\to {\mu }^{+}{K}^0$ and $p\to {\bar{\nu }}_e{\pi }^{+}$, have been analyzed for the Super-Kamiokande experiment. The monopole-induced neutrinos arise from interactions and subsequent decays of the proton decay products. To obtain the neutrino energy spectra, we use the Geant4 software to simulate propagations of daughter particles in the highly-dense solar center. It is found that $K^0$ can produce a large amount of 236 MeV monoenergetic ${\nu }_{\mu }$ neutrinos through the charge exchange process $K^0+p\to K^{+}+n$ and the subsequent decay $K^{+}\to {\mu }^{+}{\nu }_{\mu }$ at rest. Based on this interesting feature, $p\to {\mu }^{+}{K}^0$ can give the best discovery potential among three decay modes for most of the parameter space. In addition, we present the Super-Kamiokande sensitivities to the monopole flux for three proton decay modes.

   hep-phJCAP(2022)·2 citations
8. 08*

   Anomalies in the differential cross sections at 13 TeV

   O.V. Selyugin🇷🇺

   Analysis of differential cross sections of the TOTEM Collaboration data, carried out without model assumptions, shows the existence of new effects in the behavior of the hadron scattering amplitude at a small momentum transfer at a high confidence level. The quantitative description of the data in the framework of the high energy generalized structure (HEGS) model supports such a phenomenon that can be associated with the specific properties of the hadron potential at large distances. It is shown that the value of $\rho (s,t)$ at $\sqrt{s}=13$ TeV and small $t$ exceeded $0.1$.

   hep-ph4 citations
9. 09*

   $m_b(m_Z)$ revisited with Zedometry

   S. Kluth🇩🇪

   Precision measurements of $Z^0$ boson properties could enable a determination of the mass of the b quark at the scale of the $Z^0$ boson mass $m_b(m_Z)$. The dependence of Standard Model predictions on the b quark mass using the program Gfitter is studied. The precision of the currently available measurements by the LEP experiments and SLD, together with measurements from the LHC experiments of the mass of the top quark and the Higgs boson, is not sufficient for a relevant measurement. The predicted precision of $Z^0$ boson resonance measurements at future $e^{+}{e}^{-}$ colliders will allow a competitive determination of $m_b(m_Z)$.

   hep-phhep-exEPJC(2022)·7 citations
10. 10*

    The one-loop impact of a dependent mass: the role of $m_3$ in the C2HDM

    Duarte Fontes🇺🇸 · Jorge C. Romão🇵🇹

    In the complex 2-Higgs-Doublet Model (C2HDM), the mass $m_3$ of the heaviest neutral scalar $h_3$ is usually chosen as a derived parameter. We investigate one-loop corrections to $m_3$ and their impact on decays of $h_3$. Very fine-tuned regions of the parameter space can be found where such corrections are large, not due to subtraction schemes, but rather due to the particular dependence of $m_3$ on the independent parameters. We show that even moderate corrections can have a significant impact on decays of $h_3$, as they may be several times enhanced by leading-order factors.

    hep-phJHEP(2022)·7 citations
11. 11*

    Lepton collider probes for Majorana neutrino effective interactions

    Gabriel Zapata (1)🇦🇷 · Tomás Urruzola (2)🇺🇾 · Oscar A. Sampayo (1 and 3)🇦🇷 · Lucía Duarte (4) ((1) IFIMAR, CONICET UNMDP, Argentina, (2) IFFI, UdelaR Uruguay, (3) Departamento de Física, UNMDP, Argentina, (4) IFFC, UdelaR Uruguay)🇺🇾

    The extension of the standard model with new high-scale weakly coupled physics involving right-handed neutrinos in an effective field theory framework (SMNEFT) allows for a systematic study of heavy neutrinos phenomenology in current and future experiments. We exploit the outstanding angular resolution in future lepton colliders to study the sensitivity of forward-backward asymmetries to discover the possible single production of heavy Majorana neutrinos via $e^{+}{e}^{-}\to N\nu$, followed by a purely leptonic decay $N\to {\mu }^{-}{\mu }^{+}\nu$ or a semi-leptonic decay $N\to {\mu }^{-}\mathrm{jj}$, for masses $m_N>50$ GeV. In this regime, we consider the $N$ production and decays to be dominated by scalar and vectorial four-fermion $d=6$ single $N_R$ operators. This is an alternative analysis to searches using displaced vertices and fat jets, in a higher mass regime, where the $N$ is short-lived but can be found by the angular distribution of its decay products. We find that a forward-backward asymmetry between the final muons in the pure leptonic decay mode provides a sensitivity up to 12$\sigma$ for $m_N=100$ GeV, for effective couplings $\alpha =0.2$ and new physics scale $\Lambda =1$ TeV. In the case of the semi-leptonic decay, we can compare the final muon and higher $p_T$ jet flight directions, again finding up to 12$\sigma$ sensitivity to the effective signals.

    hep-phEPJC(2022)·20 citations
12. 12*

    Polarized vector meson production in semi-inclusive DIS

    Xue-shuai Jiao🇨🇳 · Kai-bao Chen🇨🇳

    We make a systematic calculation for polarized vector meson production in semi-inclusive lepton-nucleon deep inelastic scattering $e^{-}N\to e^{-}VX$. We consider the general case of neutral current electroweak interactions at high energies which give rise to parity-violating effects. We present a general kinematic analysis for the process and show that the cross sections are expressed by 81 structure functions. We further give a parton model calculation for the process and show the results for the structure functions in terms of the transverse momentum dependent parton distribution functions and fragmentation functions at the leading order and leading twist of perturbative quantum chromodynamics. The results show that there are 27 nonzero structure functions at this order, among which 15 are related to the tensor polarization of the vector meson. Thirteen structure functions are generated by parity-violating effects. We also present the result and a rough numerical estimate for the spin alignment of the vector meson.

    hep-phPRD(2022)·4 citations
13. 13*

    off-shell $t\bar{t}b\bar{b}$ in the di-lepton channel

    Manfred Kraus🇺🇸

    We report on our recent calculation for the off-shell $t\bar{t}b\bar{b}$ process in the di-lepton decay channel at the LHC. Our results take into account NLO QCD corrections for the complete $pp\to e^{+}{\nu }_e{\mu }^{-}{\bar{\nu }}_{\mu }b\bar{b}b\bar{b}$ process, and include all double, single and non-resonant contributions. We investigate the size of the corrections and their associated theoretical uncertainties. We also briefly comment on the impact of different $b$ jet definitions on our results.

    hep-ph0 citations
14. 14*

    Revisiting the gluino mass limits in the pMSSM in the light of the latest LHC data and Dark Matter constraints

    Abhi Mukherjee🇮🇳 · Saurabh Niyogi🇮🇳 · Sujoy Poddar🇮🇳

    The purpose of this paper is to examine the model dependence of the stringent constraints on the gluino mass obtained from the Large Hadron Collider (LHC) experiments by analyzing the Run II data using specific simplified models based on several ad hoc sparticle spectra which cannot be realized even in the fairly generic pMSSM models. We first revisit the bounds on the gluino mass placed by the ATLAS collaboration using the $1l+jets+\text{met}$ data. We show that the exclusion region in the $M_{\tilde{g}}-M_{{\tilde{\chi }}_1^0}$ plane in the pMSSM scenario sensitively depends on the mass hierarchy between the left and right squarks and composition of the lighter electroweakinos and, to a lesser extent, other parameters. Most importantly, for higgsino type lighter electroweakinos (except for the LSP), the bound on the gluino mass from this channel practically disappears. However, if such models are confronted by the ATLAS $jets+\text{met}$ data, fairly strong limits are regained. Thus in the pMSSM an analysis involving a small number of channels may provide more reliable mass limits. We have also performed detailed analyses on neutralino dark matter (DM) constraints in the models we have studied and have found that for a significant range of LSP masses, the relic density constraints from the WMAP/PLANCK data are satisfied and LSP-gluino coannihilation plays an important role in relic density production. We have also checked the simultaneous compatibility of the models studied here with the direct DM detection, and the LHC constraints.

    hep-phhep-exhep-thInt.J.Mod.Phys.A(2022)·8 citations
15. 15*

    Rethinking the ill-posedness of the spectral function reconstruction -- why is it fundamentally hard and how Artificial Neural Networks can help

    Shuzhe Shi🇨🇦 · Lingxiao Wang🇩🇪 · Kai Zhou🇩🇪

    Reconstructing hadron spectral functions through Euclidean correlation functions are of the important missions in lattice QCD calculations. However, in a Källen--Lehmann(KL) spectral representation, the reconstruction is observed to be ill-posed in practice. It is usually ascribed to the fewer observation points compared to the number of points in the spectral function. In this paper, by solving the eigenvalue problem of continuous KL convolution, we show analytically that the ill-posedness of the inversion is fundamental and it exists even for continuous correlation functions. We discussed how to introduce regulators to alleviate the predicament, in which include the Artificial Neural Networks(ANNs) representations recently proposed by the Authors in~[Phys. Rev. D 106 (2022) L051502]. The uniqueness of solutions using ANNs representations is manifested analytically and validated numerically. Reconstructed spectral functions using different regularization schemes are also demonstrated, together with their eigen-mode decomposition. We observe that components with large eigenvalues can be reliably reconstructed by all methods, whereas those with low eigenvalues need to be constrained by regulators.

    hep-phhep-latmath-phmath.MP+1Comput.Phys.Commun.(2023)·37 citations
16. 16*

    On the definition of local spatial densities in hadrons

    E. Epelbaum🇩🇪 · J. Gegelia🇩🇪 · N. Lange🇩🇪 · U.-G. Meißner🇩🇪 · M. V. Polyakov🇩🇪

    We show that the matrix element of a local operator between hadronic states gives rise to an unambiguous definition of the associated spatial density. As an explicit example, we consider the charge density of a spinless particle in the rest and moving frames and clarify its relationship to the electric form factor. Our results suggest that the interpretation of the spatial densities of local operators and their moments such as the mean square charge radius needs to be revised.

    hep-phhep-exnucl-thPRL(2022)·67 citations
17. 17*

    Evaluation of multi-loop multi-scale Feynman integrals for precision physics

    Ievgen Dubovyk🇵🇱 · Ayres Freitas🇺🇸 · Janusz Gluza🇵🇱 · Krzysztof Grzanka🇵🇱 · Martijn Hidding🇸🇪 · Johann Usovitsch🇨🇭

    Modern particle physics is increasingly becoming a precision science that relies on advanced theoretical predictions for the analysis and interpretation of experimental results. The planned physics program at the LHC and future colliders will require three-loop electroweak and mixed electroweak-QCD corrections to single-particle production and decay processes and two-loop electroweak corrections to pair production processes, all of which are beyond the reach of existing analytical and numerical techniques in their current form. This article presents a new semi-numerical approach based on differential equations with boundary terms specified at Euclidean kinematic points. These Euclidean boundary terms can be computed numerically with high accuracy using sector decomposition or other numerical methods. They are then mapped to the physical kinematic configuration with a series solution of the differential equation system. The method is able to deliver 8 or more digits precision, and it has a built-in mechanism for checking the accuracy of the obtained results. Its efficacy is illustrated with examples for three-loop self-energy and vertex integrals and two-loop box integrals.

    hep-phPRD(2022)·35 citations
18. 18*

    Dark sectors in neutron-shining-through-a-wall and nuclear absorption signals

    Matheus Hostert🇨🇦 · David McKeen🇨🇦 · Maxim Pospelov🇺🇸 · Nirmal Raj🇨🇦

    We propose new searches for $n^{\prime }$, a dark baryon that can mix with the Standard Model neutron. We show that IsoDAR, a proposal to place an intense cyclotron near a large-volume neutrino detector deep underground, can look for $n\to n^{\prime }\to n$ transitions with much lower backgrounds than surface experiments. This opportune neutron-shining-through-a-wall search would be possible without any modifications to the primary goals of the experiment and would provide the strongest laboratory constraints on the $n$-$n^{\prime }$ mixing for a wide range of mass splitting. We also consider dark neutrons as dark matter and show that their nuclear absorption at deep-underground detectors such as SNO and Borexino places some of the strongest limits in parameter space. Finally, we describe other $n^{\prime }$ signatures, such as neutrons shining through walls at spallation sources, reactors, and the disappearance of ultracold neutrons.

    hep-phhep-exPRD(2023)·25 citations
19. 19*

    Variations to the z-Expansion of the Form Factor Describing the Decay of B Mesons

    Daniel Simons🇺🇸 · Erik Gustafson🇺🇸 · Yannick Meurice🇺🇸

    We examine the decay rate of the particle decay $B^0\to D^{-}{\ell }^{+}{\nu }_{\ell }$ using data collected from the Belle Collaboration. We studied three parameterizations of the form factor which describe the differential decay rate, the Caprini, Lellouch, and Neubert (CLN) parametrization, the Boyd, Grinstein, and Lebed (BGL) parametrization, and the Bourrely, Caprini, and Lellouch (BCL) parameterization. The form factor is a function of the hadronic recoil variable $w$, and each parameterization contains unique free parameters which are the focus of this work. We test the extrapolations of the form factor by fitting many different subsets of the low $w$ data and then compare the prediction of the fit to the high $w$ data using a ${\chi }^2$-metric. By only fitting the low $w$ data we are able to examine the stability of extrapolations which will be informative for lattice simulations.

    hep-phPoS(2022)·0 citations
20. 20*

    Neutron Stars with Baryon Number Violation, Probing Dark Sectors

    Jeffrey M. Berryman🇺🇸 · Susan Gardner🇺🇸 · Mohammadreza Zakeri🇺🇸

    The neutron lifetime anomaly has been used to motivate the introduction of new physics with hidden-sector particles coupled to baryon number, and on which neutron stars provide powerful constraints. Although the neutron lifetime anomaly may eventually prove to be of mundane origin, we use it as motivation for a broader review of the ways that baryon number violation, be it real or apparent, and dark sectors can intertwine and how neutron star observables, both present and future, can constrain them.

    hep-phastro-ph.COastro-ph.HEgr-qc+1Symmetry(2022)·50 citations
21. 21*

    Neutrinos at FPF

    Ulrich Mosel🇩🇪 · Kai Gallmeister🇩🇪

    The GiBUU model is used to obtain information on possible neutrino-nucleus events at the proposed Forward Physics Facility (FPF) at CERN. An FPF neutrino program could contribute to fundamental questions such as formation times, color transparency and the EMC effect for neutrinos.

    hep-phhep-exnucl-exnucl-th7 citations
22. 22*

    Swiss-cheese cosmologies with variable $G$ and $\Lambda$ from the renormalization group

    Fotios K. Anagnostopoulos🇬🇷 · Alfio Bonanno🇮🇹 · Ayan Mitra🇮🇳 · Vasilios Zarikas🇰🇿

    A convincing explanation for the nature of the dark energy and dark matter is still missing. In recent works a RG-improved swiss-cheese cosmology with an evolving cosmological constant dependent on the \sch radius has been proven to be a promising model to explain the observed cosmic acceleration. In this work we extend this model to consider the combined scaling of the Newton constant $G$ and the cosmological constant $\Lambda$ according to the IR-fixed point hypothesis. We shall show that our model easily generates the observed recent passage from deceleration to acceleration without need of extra energy scales, exotic fields or fine tuning. In order to check the generality of the concept, two different scaling relations have been analysed and we proved that both are in very good agreement with $\Lambda$CDM cosmology. We also show that our model satisfies the observational local constraints on $\dot{G}/G$.

    ↳ gr-qcastro-ph.COhep-phhep-thPRD(2022)·16 citations
23. 23*

    Dynamical evolution of dark matter admixed neutron stars

    Troy Gleason🇺🇸 · Ben Brown🇺🇸 · Ben Kain🇺🇸

    We dynamically evolve for the first time dark matter admixed neutron stars with fermionic dark matter. These systems are mixtures of the ordinary nuclear matter of a neutron star and dark matter. To perform our dynamical evolutions, we derive the equations of motion, in conservation form, for spherically symmetric systems with an arbitrary number of perfect fluids. Using finite volume and high-resolution shock-capturing methods, we dynamically evolve the two-fluid case, with the first fluid modeling ordinary matter and the second fluid modeling dark matter. We use our dynamical solutions to study nonlinear stability, radial oscillation frequencies, and a dynamical formation process.

    ↳ gr-qcastro-ph.HEhep-phPRD(2022)·40 citations
24. 24*

    Chiral condensates and screening masses of neutral pseudoscalar mesons in thermomagnetic QCD medium

    H.-T. Ding🇨🇳 · S.-T. Li🇨🇳 · J.-H. Liu🇨🇳 · X.-D. Wang🇨🇳

    We point out that chiral condensates at nonzero temperature and magnetic fields are in strict connection to the space-time integral of corresponding two-point neutral meson correlation functions in the pseudoscalar channel via the Ward-Takahashi identity. Screening masses of neutral pseudoscalar mesons, which are defined as the exponential decay of the corresponding spatial correlation functions in the long distance, thus are intrinsically connected to (inverse) magnetic catalysis of chiral condensates. To study this we performed lattice simulations of $(2+1)$-flavor QCD on $32^3\times N_t$ lattices with pion mass $M_{\pi }\simeq 220$ MeV in a fixed scale approach having temperature $T\in [17,281]$ MeV and magnetic field strength $eB\in [0,2.5]$ GeV${}^2$. We find that screening lengths, i.e. inverses of screening masses of ${\pi }^0$, $K^0$ and ${\eta }_{s\bar{s}}^0$, turn out to have the similar complex $eB$ and $T$ dependences of the corresponding chiral condensates. Although the transition temperature is found to always decrease as $eB$ grows, we show that the suppression due to magnetic fields becomes less significant for hadron screening length and chiral condensates with heavier quarks involved, and ceases to occur for ${\eta }_{s\bar{s}}^0$ and strange quark chiral condensate. The complex $eB$ and $T$ dependences of both screening masses and chiral condensates, reflecting the crossover nature of the QCD transition, are attributed to the competition between sea and valence quark effects. These findings could be useful to guide low-energy models and effective theories of QCD.

    ↳ hep-lathep-phhep-thnucl-thPRD(2022)·54 citations
25. 25*

    An Experiment for Electron-Hadron Scattering at the LHC

    K. D. J. André🇨🇭 · L. Aperio Bella🇩🇪 · N. Armesto🇪🇸 · S. A. Bogacz🇺🇸 · D. Britzger🇩🇪 · O. S. Brüning🇨🇭 · M. D'Onofrio🇬🇧 · E. G. Ferreiro🇪🇸 · O. Fischer🇬🇧 · C. Gwenlan🇬🇧 · B. J. Holzer🇨🇭 · M. Klein🇬🇧 and 14 other authors

    Novel considerations are presented on the physics, apparatus and accelerator designs for a future, luminous, energy frontier electron-hadron ($eh$) scattering experiment at the LHC in the thirties for which key physics topics and their relation to the hadron-hadron HL-LHC physics programme are discussed. Demands are derived set by these physics topics on the design of the LHeC detector, a corresponding update of which is described. Optimisations on the accelerator design, especially the interaction region (IR), are presented. Initial accelerator considerations indicate that a common IR is possible to be built which alternately could serve $eh$ and $hh$ collisions while other experiments would stay on $hh$ in either condition. A forward-backward symmetrised option of the LHeC detector is sketched which would permit extending the LHeC physics programme to also include aspects of hadron-hadron physics. The vision of a joint $eh$ and $hh$ physics experiment is shown to open new prospects for solving fundamental problems of high energy heavy-ion physics including the partonic structure of nuclei and the emergence of hydrodynamics in quantum field theory while the genuine TeV scale DIS physics is of unprecedented rank.

    ↳ hep-exhep-phnucl-exEPJC(2022)·25 citations
26. 26*

    A Tachyon Field around the Black Hole

    Narges Rashidi🇮🇷

    We study the effects of the presence of the tachyon field around the black hole. We show that in presence of the tachyon field, unlike the ordinary canonical scalar field, the time evolution of the black hole mass depends on the potential of this field. By considering several types of potential, we study the behavior of the black hole mass and its time evolution and find some interesting results. We find that the presence of the tachyon field causes the accretion of the mass into the black hole. We also show that with linear and hilltop potentials, in some ranges of the parameters space, the mass of the black hole can decrease even without any Hawking radiation.

    ↳ gr-qchep-phhep-thInt.J.Mod.Phys.D(2022)·0 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.