Mon·Aug 15, 2022Monday·August 15, 2022

1. 01*

   A new approach to color-coherent parton evolution

   Florian Herren🇺🇸 · Stefan Höche🇺🇸 · Frank Krauss🇬🇧 · Daniel Reichelt🇬🇧 · Marek Schoenherr🇬🇧

   We present a simple parton-shower model that replaces the explicit angular ordering of the coherent branching formalism with a differentially accurate simulation of soft-gluon radiation by means of a non-trivial dependence on azimuthal angles. We introduce a global kinematics mapping and provide an analytic proof that it satisfies the criteria for next-to leading logarithmic accuracy. In the new algorithm, initial and final state evolution are treated on the same footing. We provide an implementation for final-state evolution in the numerical code Alaric and present a first comparison to experimental data.

   hep-phJHEP(2023)·86 citations
2. 02*

   Massive 2- and 3-loop corrections to hard scattering processes in QCD

   Marco Saragnese🇩🇪

   With the increasing experimental precision available at colliders, higher-order perturbative calculations are required to reduce the theory uncertainty in order to extract crucial QCD parameters, such as the strong coupling constant, to the required precision, often the order of one percent. For this reason, the contributions of the massive charm and bottom quarks need to be taken into account in hadronic processes such as deep-inelastic scattering. In this thesis, we calculate to order ${\alpha }_s^3$ the two-mass contributions to the twist-two polarized operator matrix elements $A_{gg,Q}^{(3)}$ and $A_{Qq}^{(3),PS}$ as functions of the heavy quark mass ratio. We discuss the mathematical structure of these objects and discuss their phenomenological importance for the variable flavour number scheme and mathematical and computer-algebraic aspects of their calculation. We further address the impact of the heavy quarks to the scheme-invariant evolution of structure functions and introduce a Fortran library for their evaluation. We also discuss a computer algebra implementation of a solver for partial linear difference equations.

   hep-phhep-ex1 citation
3. 03*

   Yang-Mills All-Plus: Two Loops for the Price of One

   David A. Kosower🇫🇷 · Sebastian Pögel🇩🇪

   We present work on two-loop amplitudes in pure Yang-Mills theory with all gluons of identical helicity. We show how to obtain their rational terms -- the hardest parts to compute -- via well-understood one-loop unitarity techniques.

   hep-phhep-thPoS(2022)·5 citations
4. 04*

   Studies of multi-jet merging with Parton Branching TMD evolution

   Aron Mees van Kampen🇧🇪

   QCD predictions for final states with multiple jets in hadron collisions make use of multi-jet merging methods, which allow one to combine consistently the contributions from hard scattering matrix elements with different parton multiplicities and parton showers. In this article I consider a multi-jet merging method that has recently been proposed to take into account the effects of transverse momentum dependent (TMD) evolution and parton shower, and present studies focusing on the application of this method to jets associated with Drell-Yan (DY) production in the region of high masses.

   hep-ph1 citation
5. 05*

   Discovery prospects for heavy dark matter in KAGRA

   Chun-Hao Lee🇹🇼 · Reinard Primulando🇮🇩 · Martin Spinrath🇹🇼

   We discuss the discovery prospects for kg-scale dark matter with a Yukawa-like long-range interaction in Kamioka Gravitational Wave Detector (KAGRA). We consider the interaction range to be in the order of kilometers, thus the dark matter may interact with multiple KAGRA mirrors simultaneously. The induced signal strain is in many cases dominated by frequencies below about 130 Hz. Due to the geometry of the detector there is some strong directional sensitivity. It turns out that KAGRA would be able to constrain such kind of dark matter within a few years of operation. With our set of assumptions we expect that KAGRA could detect a few events per year for 10 kg dark matter, with a Yukawa interaction with a range of 10 km and an effective coupling constant around $10^6$.

   hep-phhep-exPRD(2023)·15 citations
6. 06*

   Phenomenology of gluon TMDs from ${\eta }_{b,c}$ production

   Alessandro Bacchetta🇮🇹 · Francesco Giovanni Celiberto🇮🇹 · Marco Radici🇮🇹 · Andrea Signori🇮🇹

   We present the potential of ${\eta }_{b,c}$ production in proton collisions to access the gluon transverse-momentum dependent parton distributions (TMDs). In particular, we explore the phenomenology of the unpolarized and linearly-polarized gluon TMDs in unpolarized collisions for different kinematic settings, and the potential of a fixed-target experiment at the LHC.

   hep-ph22 citations
7. 07*

   Implications of first LZ and XENONnT results: A comparative study of neutrino properties and light mediators

   ShivaSankar K.A. · Anirban Majumdar🇮🇳 · Dimitrios K. Papoulias🇬🇷 · Hemant Prajapati🇮🇳 · Rahul Srivastava🇮🇳

   Next generation direct dark matter detection experiments are favorable facilities to probe neutrino properties and light mediators beyond the Standard Model. We explore the implications of the recent data reported by LUX-ZEPLIN (LZ) and XENONnT collaborations on electromagnetic neutrino interactions and neutrino generalized interactions (NGIs). We show that XENONnT places the most stringent upper limits on the effective and transition neutrino magnetic moment (of the order of few $\times 10^{-12}{\mu }_B$) as well as stringent constraints to neutrino millicharge (of the order of $\sim 10^{-13}e$)--competitive to LZ--and improved by about one order of magnitude in comparison to existing constraints coming from Borexino and TEXONO. We furthermore explore the XENONnT and LZ sensitivities to simplified models with light NGIs and find improved constraints in comparison to those extracted from Borexino-Phase II data.

   hep-phhep-exPLB(2023)·74 citations
8. 08*

   Probing $R$-parity violation in $B$-meson decays to a baryon and a light neutralino

   Claudio O. Dib🇨🇱 · Juan Carlos Helo🇨🇱 · Valery E. Lyubovitskij🇩🇪 · Nicolás A. Neill🇨🇱 · Abner Soffer🇮🇱 · Zeren Simon Wang🇹🇼

   We propose a search for $B$ meson decays to a baryon plus missing energy at the Belle II experiment to probe supersymmetry with a GeV-scale lightest neutralino ${\tilde{\chi }}_1^0$ and $R$-parity violation (RPV). We perform analytic computations of the signal branching fractions in the framework of effective field theory, with a single nonzero RPV operator ${\lambda }_{ij3}^{\prime \prime }{\bar{U}}_i^c{\bar{D}}_j^c{\bar{D}}_3^c$, where $i,j=1,2$. The hadronic form factors are calculated using an SU(3) phenomenological Lagrangian approach for the proton, as well as several hyperons and charmed baryons. Since the decay of the neutralino is kinematically and CKM suppressed in this theoretical scenario, it decays outside the detector and appears experimentally only as missing energy. We detail the analysis techniques at the experimental level and estimate the background in the $B^{+}\to p{\tilde{\chi }}_1^0$ search using published results for $B^{+}\to K^{+}\nu \bar{\nu }$. Our final sensitivity plots are shown for both ${\lambda }_{113}^{\prime \prime }$ versus the squark mass $m_{\tilde{q}}$ and ${\lambda }_{113}^{\prime \prime }/m_{\tilde{q}}^2$ versus the neutralino mass $m_{{\tilde{\chi }}_1^0}$. We find that the search at Belle II could probe ${\lambda }_{113}^{\prime \prime }/m_{\tilde{q}}^2$ down to the order of $10^{-8}$ GeV${}^{-2}$ in the kinematically allowed $m_{{\tilde{\chi }}_1^0}$ range. We also obtain current limits on ${\lambda }_{123}^{\prime \prime }$ by recasting an existing search interpreted as $B^0\to {\Lambda }^0{\tilde{\chi }}_1^0$, and comment about searches for $B^{+}\to {\Sigma }^{+}{\tilde{\chi }}_1^0$, $B^0\to {\Sigma }^0{\tilde{\chi }}_1^0$, $B^{+}\to {\Lambda }_c^{+}{\tilde{\chi }}_1^0$, and $B^{+}\to {\Xi }_c^{+}{\tilde{\chi }}_1^0$. In closing, we briefly discuss potential searches at the LHCb and BESIII experiments.

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

   $E_6$ Models in Light of Precision $M_W$ Measurements

   Vernon Barger🇺🇸 · Cash Hauptmann🇺🇸 · Peisi Huang🇺🇸 · Wai-Yee Keung🇺🇸

   We propose a solution to the recent $W$ mass measurement by embedding the Standard Model within $E_6$ models. The presence of a new $U(1)$ group shifts the $W$ boson mass at the tree level and introduces a new gauge boson $Z^{\prime }$ which has been searched for at collider experiments. In this article, we identity the parameter space that explains the new $W$ mass measurement and is consistent with current experimental $Z^{\prime }$ searches. As $U(1)$ extensions can be accommodated in supersymmetric models, we also consider the supersymmetric scenario of $E_6$ models, and show that a 125 GeV Higgs may be easily achieved in such settings.

   hep-phhep-exPRD(2023)·5 citations
10. 10*

    Non-Standard Neutrino Self-Interactions Can Cause Neutrino Flavor Equipartition Inside the Supernova Core

    Sajad Abbar🇩🇪

    We show that non-standard neutrino self-interactions can lead to total flavor equipartition in a dense neutrino gas, such as those expected in core-collapse supernovae. In this first investigation of this phenomenon in the multi-angle scenario, we demonstrate that such a flavor equipartition can occur on very short scales, and therefore very deep inside the newly formed proto-neutron star, with a possible significant impact on the physics of core-collapse supernovae. Our findings imply that future galactic core-collapse supernovae can appreciably probe non-standard neutrino self-interactions, for certain cases even when they are many orders of magnitude smaller than the Standard Model terms.

    ↳ astro-ph.HEhep-phPRD(2023)·4 citations
11. 11*

    Photon Production in High-Energy Heavy-Ion Collisions: Thermal Photons and Radiative Recombination

    Hirotsugu Fujii🇯🇵 · Kazunori Itakura🇯🇵 · Katsunori Miyachi🇯🇵 · Chiho Nonaka🇯🇵

    We present a comprehensive analysis of photon production at RHIC and the LHC, proposing radiative hadronization as an additional photon source in high-energy heavy-ion collisions. For thermal photon, we perform relativistic viscous hydrodynamic calculation with event-by-event fluctuations.

    ↳ nucl-thhep-phnucl-exActa Phys.Polon.Supp.(2023)·2 citations
12. 12*

    On approximations of Feynman path integrals

    Tapani Hyttinen🇫🇮

    We study approximations of Feynman path integrals in finite dimensional spaces and how the approximations determine the propagator.

    ↳ math.LOhep-ph0 citations
13. 13*

    Black hole superradiance with (dark) matter accretion

    Lam Hui🇺🇸 · Y.T. Albert Law🇺🇸 · Luca Santoni🇮🇹 · Guanhao Sun🇺🇸 · Giovanni Maria Tomaselli🇳🇱 · Enrico Trincherini🇮🇹

    Studies of black hole superradiance often focus on the growth of a cloud in isolation, accompanied by the spin-down of the black hole. In this paper, we consider the additional effect of the accretion of matter and angular momentum from the environment. We show that, in many cases, the black hole evolves by drifting along the superradiance threshold, in which case the evolution of its parameters can be described analytically or semi-analytically. We quantify the conditions under which accretion can serve as a mechanism to increase the cloud-to-black hole mass ratio, beyond the standard maximum of about 10%. This occurs by a process we call over-superradiance, whereby accretion effectively feeds the superradiance cloud, by way of the black hole. We give two explicit examples: accretion from a vortex expected in wave dark matter and accretion from a baryonic disk. In the former case, we estimate the accretion rate by using an analytical fit to the asymptotic behavior of the confluent Heun function. Level transition, whereby one cloud level grows while the other shrinks, can be understood in a similar way.

    ↳ gr-qcastro-ph.HEhep-phhep-thPRD(2023)·60 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.