Mon·Aug 14, 2023Monday·August 14, 2023

1. 01*

   Search for Electroweakinos in R-Parity Violating SUSY with Long-Lived Particles at HL-LHC

   Biplob Bhattacherjee🇮🇳 · Prabhat Solanki🇮🇳

   We investigate the R-parity violating (RPV) supersymmetric (SUSY) model at the High-Luminosity Large Hadron Collider (HL-LHC) in the context of compact muon solenoid (CMS) experiment assuming a total integrated luminosity of $\mathcal{L}=3000{\text{fb}}^{-1}$ at $\sqrt{s}=$ 14 TeV. We focus on the pair production of electroweakinos, specifically, ${\chi }_2^0$ and ${\chi }_1^{\pm }$ in wino and higgsino states in a particular scenario where ${\chi }_2^0$ and ${\chi }_1^{\pm }$ decay into a Higgs boson and W boson, respectively, along the long-lived lightest supersymmetric particle (LSP), ${\chi }_1^0$, which decays to three quarks via ${\lambda }^{{}^{\prime \prime }}$ RPV couplings leading to the prompt as well as displaced signatures in the final state. To select events at the level-1 (L1) trigger system, we employ dedicated and standard triggers followed by an offline analysis integrating information from the tracker, electromagnetic calorimeter (ECAL) and minimum ionising particle (MIP) timing detector (MTD). We observe that wino-like ${\chi }_2^0/{\chi }_1^{\pm }$ with a mass of 1900 GeV and ${\chi }_1^0$ with a mass greater than 800 GeV can be probed across a decay length ranging from 1 cm to 200 cm. In the case of higgsino-like pair production of ${\chi }_2^0/{\chi }_1^{\pm }$, we can probe ${\chi }_2^0/{\chi }_1^{\pm }$ with a mass of 1600 GeV, and ${\chi }_1^0$ with a mass greater than 700 GeV, across a decay length range of 1 cm to 200 cm.

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

   Long Lived Particle Decays in MATHUSLA

   David Curtin🇨🇦 · Jaipratap Singh Grewal🇨🇦

   We carefully study the decay and reconstruction of long-lived particle (LLP) decays in the proposed MATHUSLA LLP detector for the HL-LHC. Our investigations are focused on three LLP benchmark models. MATHUSLA's primary physics target is represented by hadronically decaying LLPs with mass above $\sim$ $10\mathrm{GeV}$, produced in exotic Higgs decays. We also investigate GeV-scale scalar and right-handed-neutrino LLPs, which are the target of many other proposed experiments. We first introduce a public MATHUSLA FastSim code to allow for efficient signal-only studies of LLP decays in MATHUSLA and general external LLP detectors. For each of our benchmark scenarios, we carefully simulate LLP production and decay, and make our simulation library publicly accessible for future investigations and comparisons with other experiments. We then systematically study the geometric acceptance of MATHUSLA for LLP decays in these scenarios, and present updated sensitivity projections that include these acceptances. Our results show that the idealized reach of MATHUSLA computed in earlier studies is mostly realized. We also investigate possible ways of increasing the signal acceptance using the inherent geometric flexibility of the FastSim, which will provide useful inputs for realistic experimental and engineering optimization of the detector in the future.

   hep-phhep-exPRD(2024)·25 citations
3. 03*

   $A_5$ symmetry and deviation from Golden Ratio mixing with charged lepton flavor violation

   Victoria Puyam🇮🇳 · N. Nimai Singh🇮🇳

   A neutrino mass model that can satisfy the exact golden ratio mixing is constructed using $A_5$ discrete symmetry group. The deviation from the golden ratio mixing is studied by considering the contribution from the charged lepton sector in a linear seesaw framework. A definite pattern of charged lepton mass matrix predicted by the model controls the leptonic mixing angles. By taking the observed ${\theta }_{13}$ as the input value, we can obtain the values of all the mixing angles and Dirac CP-violating phase within the current experimental bounds. The model predicts that only the normal neutrino mass ordering is consistent with the current oscillation data. We also study the two body charged lepton flavor violation (cLFV) processes such as $\mu \to e+\gamma$, $\tau \to e+\gamma$ and $\tau \to \mu +\gamma$ and neutrinoless double beta decay parameter $m_{\beta \beta }$. The present neutrino mass model can explain the current and future sensitivity of $\mu \to e+\gamma$, $\tau \to e+\gamma$ processes and the present sensitivity of neutrinoless double beta decay parameter when the masses of quasi-Dirac neutrinos are in the TeV range. On the other hand, the model cannot reproduce the present sensitivity of $\tau \to \mu +\gamma$ but can explain the future sensitivity and the present sensitivity of neutrinoless double beta decay parameter simultaneously when the masses of the quasi-Dirac neutrinos are in the TeV range.

   hep-phNPB(2025)·5 citations
4. 04*

   Computing Mellin representations and asymptotics of nested binomial sums in a symbolic way: the RICA package

   Johannes Bluemlein🇩🇪 · Nikolai Fadeev🇦🇹 · Carsten Schneider🇦🇹

   Nested binomial sums form a particular class of sums that arise in the context of particle physics computations at higher orders in perturbation theory within QCD and QED, but that are also mathematically relevant, e.g., in combinatorics. We present the package RICA (Rule Induced Convolutions for Asymptotics), which aims at calculating Mellin representations and asymptotic expansions at infinity of those objects. These representations are of particular interest to perform analytic continuations of such sums.

   hep-phcs.SCACM Commun.Comp.Alg.(2023)·2 citations
5. 05*

   Characterizing nuclear modification effects in high-energy O-O collisions at energies available at the CERN Large Hadron Collider: A transport model perspective

   Debadatta Behera🇮🇳 · Suman Deb🇫🇷 · Captain R. Singh🇮🇳 · Raghunath Sahoo🇮🇳

   The present work focuses on Oxygen-Oxygen (O-O) collisions, which are planned at the CERN Large Hadron Collider. Oxygen, being a doubly magic number nucleus, has some very unique features. This study attempts to probe the exotic state of QCD matter in O-O collisions. Additionally, the role of different nuclear density profiles in governing the final state dynamics in ultra-relativistic nuclear collisions is also explored. Using a multi-phase transport model, we obtain the nuclear modification factor (${\text{R}}_{\text{AA}}$) for all charged hadrons and identified particles for O-O collisions at $\sqrt{s_{\mathrm{NN}}}$ = 7 TeV. Furthermore, we investigate the behavior of ${\text{R}}_{\text{AA}}$ as a function of transverse momentum (${\text{p}}_{\mathrm{T}}$) for three centralities (most central, mid-central, and peripheral) considering both $\alpha$-cluster and Woods-Saxon nuclear density profiles. We also extend this work to study the rapidity dependence of ${\text{R}}_{\text{AA}}$ for all charged hadrons. To better understand our findings of O-O collisions, the results are confronted with the available data of ${\text{R}}_{\text{AA}}$ for Pb-Pb collisions. The present study sheds light on particle production mechanisms, emphasizing factors influencing particle yield from pre-collision to post-collision stages in the context of O-O collisions.

   hep-phhep-exnucl-exnucl-thPRC(2024)·23 citations
6. 06*

   Naturally small neutrino mass with asymptotic safety and gravitational-wave signatures

   Abhishek Chikkaballi🇵🇱 · Kamila Kowalska🇵🇱 · Enrico Maria Sessolo🇵🇱

   We revisit the dynamical generation of an arbitrarily small neutrino Yukawa coupling in the Standard Model with trans-Planckian asymptotic safety and apply the same mechanism to the gauged $B-L$ model. We show that thanks to the presence of additional irrelevant couplings, the described neutrino-mass generation in the $B-L$ model is potentially more in line with existing theoretical calculations in quantum gravity. Interestingly, the model can accommodate, in full naturalness and without extensions, the possibility of purely Dirac, pseudo-Dirac, and Majorana neutrinos with any see-saw scale. We investigate eventual distinctive signatures of these cases in the detection of gravitational waves from first-order phase transitions. We find that, while it is easy to produce a signal observable in new-generation interferometers, its discriminating features are washed out by the strong dependence of the gravitational-wave spectrum on the relevant parameters of the scalar potential.

   hep-phJHEP(2023)·19 citations
7. 07*

   Molecular components in the $J/\psi$ and the $\rho$-$\pi$ puzzle

   Xing-Dao Guo🇨🇳 · Dian-Yong Chen🇨🇳 · Xue-Qian Li🇨🇳 · Zhong-Yuan Yuan🇨🇳 · Shijin Sang🇨🇳

   Motivated by the large branching fractions of $J/\psi \to f_0(1710)\omega /f_0(1710)\varphi$ and the light exotic candidates, we find that there may exist molecular states composed of $f_0(1710)\omega$ and $f_0(1710)\varphi$, which correspond to $X(2440)$ and $X(2680)$ observed in a few decades before. The branching fraction of $X(2440)$ and $X(2680)$ to various $PV$ channels and $KK\omega (\varphi )$ channels are estimated in the molecular scenario. In addition, the large branching fractions of $J/\psi \to f_0(1710)\omega /f_0(1710)\varphi$ indicate the sizable molecular components in the $J/\psi$ state. Thus, we consider the $J/\psi$ as the supperposition of $c\bar{c}(1S)$, $f_0(1710)\omega$ and $f_0(1710)\varphi$ molecular states, and these molecular components have significant impact on the light hadron decays of $J/\psi$, which may shield light on the long standing $\rho -\pi$ puzzle.

   hep-phCPC(2024)·2 citations
8. 08*

   An effective gauge field theory of the nucleon interactions

   Eduard Boos🇷🇺

   We discuss the possibility of constructing an effective gauge field theory of the nucleon interations based on the ideas of isotopic invariance as well as hypercharge invariance as a local gauge symmetry and spontaneous breaking of this symmetry. The constructed model predicts the structure of interactions of protons and neutrons with $\rho$- and $\sigma$-mesons, with pi-mesons and photons, as well as interactions of these particles with each other. The Lagrangian of the model consists of several parts parts involving dimension 4 and 5 gauge invariant operators. Feynman rules for physical degrees of freedom as follow from the Lagrangian define the structure of diagrams for one-boson exchanges between nucleons predicting the internucleon one-boson exchange potential as well as nucleon scattering amplitudes. The range of applicability of the model is discussed and estimates are made of the resulting coupling constants. The model predicts the mass of the neutral ${\rho }^0$-meson to be about $1MeV$ larger than the mass of the charged mesons ${\rho }^{\pm }$. The vector $\omega$-meson, which is a sterile particle with respect to the considered gauge group $S{U}_I(2)\times U_Y(1)$, can be added to the scheme by means of a gauge-invariant operator of dimension 5, as shown in Appendix ~A.

   hep-phnucl-thCommun.Theor.Phys.(2024)·0 citations
9. 09*

   Self-interacting dark matter and the GRB221009A event

   Debasish Borah🇮🇳 · Satyabrata Mahapatra🇰🇷 · Narendra Sahu🇮🇳 · Vicky Singh Thounaojam🇮🇳

   In this work, we explore the intriguing possibility of connecting self-interacting dark matter (SIDM) with the recently observed exceptionally bright and long-duration Gamma Ray Burst (GRB221009A). The proposed minimal scenario involves a light scalar mediator, simultaneously enabling dark matter (DM) self-interaction and explaining the observed very high energy (VHE) photons from GRB221009A reported by LHAASO's data. The scalar's mixing with the standard model (SM) Higgs boson allows for its production at the GRB site, which will then propagate escaping attenuation by the extra-galactic background light (EBL). These scalars, if highly boosted, have the potential to explain LHAASO's data. Moreover, the same mixing also facilitates DM-nucleon or DM-electron scatterings at terrestrial detectors, linking SIDM phenomenology to the GRB221009A events. This manuscript presents the parameter space meeting all constraints and offers an exciting opportunity to explore SIDM in future direct search experiments using insights from the GRB observation.

   hep-phastro-ph.COPRD(2023)·7 citations
10. 10*

    Positivity and the Electroweak Hierarchy

    Joe Davighi🇨🇭 · Scott Melville🇬🇧 · Ken Mimasu🇬🇧 · Tevong You🇬🇧

    We point out that an unnatural hierarchy between certain higher-dimensional operator coefficients in a low-energy Effective Field Theory (EFT) would automatically imply that the Higgs' vacuum expectation value is hierarchically smaller than the EFT cut-off, assuming the EFT emerged from a unitary, causal and local UV completion. Future colliders may have the sensitivity to infer such a pattern of coefficients for a little hierarchy with an EFT cut-off up to $\mathcal{O}(10)$ TeV.

    hep-phhep-thPRD(2024)·9 citations
11. 11*

    Effective Field Theory for Dark Matter Absorption on Single Phonons

    Andrea Mitridate🇩🇪 · Kris Pardo🇺🇸 · Tanner Trickle🇺🇸 · Kathryn M. Zurek🇺🇸

    Single phonon excitations, with energies in the $1-100\text{meV}$ range, are a powerful probe of light dark matter (DM). Utilizing effective field theory, we derive a framework to compute DM absorption rates into single phonons starting from general DM-electron, proton, and neutron interactions. We apply the framework to a variety of DM models: Yukawa coupled scalars, axionlike particles (ALPs) with derivative interactions, and vector DM coupling via gauge interactions or Standard Model electric and magnetic dipole moments. We find that GaAs or ${\text{Al}}_2{\text{O}}_3$ targets can set powerful constraints on a $U(1{)}_{B-L}$ model, and targets with electronic spin ordering are similarly sensitive to DM coupling to the electron magnetic dipole moment. Lastly, we make the code, \textsf{PhonoDark-abs} (an extension of the existing \textsf{PhonoDark} code which computes general DM-single phonon scattering rates), publicly available.

    hep-phastro-ph.COcond-mat.mtrl-sciPRD(2024)·26 citations
12. 12*

    An Algebraic Formula for Two Loop Renormalization of Scalar Quantum Field Theory

    Elizabeth E. Jenkins🇺🇸 · Aneesh V. Manohar🇺🇸 · Luca Naterop🇨🇭 · Julie Pagès🇺🇸

    We find a general formula for the two-loop renormalization counterterms of a scalar quantum field theory with interactions containing up to two derivatives, extending 't~Hooft's one-loop result. The method can also be used for theories with higher derivative interactions, as long as the terms in the Lagrangian have at most one derivative acting on each field. We show that diagrams with factorizable topologies do not contribute to the renormalization group equations. The results in this paper will be combined with the geometric method in a subsequent paper to obtain the counterterms and renormalization group equations for the scalar sector of effective field theories (EFT) to two-loop order.

    hep-phJHEP(2023)·41 citations
13. 13*

    Top Yukawa Coupling Determination at High Energy Muon Collider

    Zhen Liu🇺🇸 · Kun-Feng Lyu🇺🇸 · Ishmam Mahbub🇺🇸 · Lian-Tao Wang🇺🇸

    The Top Yukawa coupling profoundly influences several core mysteries linked to the electroweak scale and the Higgs boson. We study the feasibility of measuring the Top Yukawa coupling at high-energy muon colliders by examining the high-energy dynamics of the weak boson fusion to top quark pair processes. A deviation of the Top Yukawa coupling from the Standard Model would lead modified $VV\to t\bar{t}$ process, violating unitarity at high energy. Our analysis reveals that utilizing a muon collider with a center-of-mass energy of 10 TeV and an integrated luminosity of 10 ab${}^{-1}$ allows us to investigate the Top Yukawa coupling with a precision surpassing 1.5\%, more than one order of magnitude better than the precision from $t\bar{t}h$ channel at muon colliders. This precision represents a notable enhancement compared to the anticipated sensitivities of the High-Luminosity LHC (3.4\%) and those at muon colliders derived from the $t\bar{t}H$ process.

    hep-phhep-exPRD(2024)·25 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.