Publications

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Exponential enhancement of dark matter freezeout abundance

Bibhushan Shakya

SciPost Phys. Proc. 12, 070 (2023) · published 5 July 2023 | · pdf

A novel paradigm for thermal dark matter (DM), termed "bouncing dark matter", is presented. In canonical thermal DM scenarios, the DM abundance falls exponentially as the temperature drops below the mass of DM, until thermal freezeout occurs. This note explores a broader class of thermal DM models that are exceptions to this rule, where the DM abundance can deviate from the exponentially falling curve, and even rise exponentially, while in thermal equilibrium. Such scenarios can feature present day DM annihilation cross sections much larger than the canonical thermal target, improving the prospects for indirect detection of DM annihilation signals.
Anomalous coupling studies with forward protons at the LHC

C. Royon

SciPost Phys. Proc. 8, 115 (2022) · published 13 July 2022 | · pdf

We describe the gain on sensitivities to quartic $\gamma \gamma \gamma \gamma$, $\gamma \gamma WW$ and $\gamma \gamma \gamma Z$ anomalous couplings and to the search for Axion-Like Particles by two or three orders of magnitude with respect to standard methods at the LHC by tagging intact protons in the final state.
Group invariants for Feynman diagrams

Idrish Huet, Michel Rausch de Traubenberg, Christian Schubert

SciPost Phys. Proc. 14, 031 (2023) · published 24 November 2023 | · pdf

It is well-known that the symmetry group of a Feynman diagram can give important information on possible strategies for its evaluation, and the mathematical objects that will be involved. Motivated by ongoing work on multi-loop multi-photon amplitudes in quantum electrodynamics, here I will discuss the usefulness of introducing a polynomial basis of invariants of the symmetry group of a diagram in Feynman-Schwinger parameter space.
Top quark pair and single top cross sections and ttX (CMS)

Ravindra K Verma

SciPost Phys. Proc. 8, 108 (2022) · published 13 July 2022 | · pdf

Latest results on inclusive and differential top quark pair and single top quark production cross sections are presented using proton-proton collision data collected by the CMS experiment. The differential cross sections are measured as a function of various kinematic observables of the top quarks and the jets and leptons of the event final state. The results are confronted with precise theory calculations and used to constrain Standard Model parameters. Measurements are performed also with high pT top quarks, i.e., in boosted regimes.
T-odd quark-gluon-quark correlation function in the light-front quark-diquark model

Shubham Sharma, Narinder Kumar, Harleen Dahiya

SciPost Phys. Proc. 8, 170 (2022) · published 14 July 2022 | · pdf

We have scrutinized the transverse momentum dependent quark-gluon-quark correlation function. We have utilized the light-front quark-diquark model to study the time-reversal-odd interaction-dependent twist-3 gluon distributions which we have obtained from the disintegration of the transverse momentum dependent quark-gluon-quark correlator. Specifically, we have studied the behavior of $\tilde{e}_{L}$ and $\tilde{e}_{T}$ while considering our diquark to be an axial-vector.
New perspectives in gravity-mediated supersymmetry breaking

Robin Ducrocq

SciPost Phys. Proc. 14, 027 (2023) · published 24 November 2023 | · pdf

New solutions in supersymmetry breaking through gravity mediation have been recently discovered. Such solutions have interesting properties regarding renormalisation and introduce new contributions in the scalar potential that may help to resolve some issues of the Standard Model. The purpose of this article is to investigate the consequences of these new structures. We construct a model related to these new solutions, the S2MSSM, and present some preliminary results on the effects of these new contributions, especially on the Standard Model's Higgs boson mass.
Reference measurements for indirect dark matter searches with p+C collisions at the NA61/SHINE experiment

Michał Naskręt on behalf of the NA61/SHINE Collaboration

SciPost Phys. Proc. 12, 068 (2023) · published 5 July 2023 | · pdf

NA61/SHINE is a large-acceptance fixed-target experiment located at the CERN SPS, which studies final hadronic states in interactions of various particles and nuclei. It is unique in terms of providing data on a variety of collision systems at different collision energies. This allows for wide deuteron, antiproton and antideuteron production cross-section studies. The latter are currently considered a possible dark matter interaction signal with exceptionally small background. The measurements on carbon targets are important to reduce systematic experimental effects due to experiment-internal antideuteron production, as the most abundant element in the path of an incoming particle for the AMS-02 experiment is carbon. This manuscript will focus on analysis of NA61/SHINE data on p+C thin target collisions in the context of light (anti)nuclei production. A preliminary analysis of experimental data and the particle identification method as well as current deuteron and antideuteron yields will be described.
Possible studies of gluon transversity in the spin-1 deuteron at hadron-accelerator facilities

S. Kumano, Qin-Tao Song

SciPost Phys. Proc. 8, 100 (2022) · published 13 July 2022 | · pdf

Chiral-odd gluon transversity distribution could shed light on a new aspect of hadron physics. Although we had much progress recently on quark transversity distributions, there is no experimental measurement on the gluon transversity. The gluon trasversity does not exist in the spin-1/2 nucleons and it exists in the spin-1 deuteron. Therefore, it could probe new hadron physics in the deuteron beyond the basic bound system of a proton and a neutron because the nucleons cannot contribute directly. Here, we explain that the gluon transversity can be measured at hadron accelerator facilities, such as Fermilab and NICA, in addition to charged-lepton scattering measurements at lepton accelerator facilities by showing cross sections of the proton-deuteron Drell-Yan process as an example.
DsTau: study of tau neutrino production with nuclear emulsion in the CERN-SPS

Ali Murat Guler

SciPost Phys. Proc. 8, 094 (2022) · published 13 July 2022 | · pdf

Tau neutrino is one of the least known particle of Standard Model; there are only few measurements with a limited statistics. The DONUT experiment first reported the tau neutrino interaction cross-section but their measurement suffers from large systematic error of more than $50\%$ which is mainly due to uncertainty in the tau neutrino flux prediction. The tau neutrino cross section is an essential ingredient in neutrino experiments and its precise measurement would enable a search for new physics effects such as testing the Lepton Universality in neutrino interactions. The main goal of the DsTau experiment is to measure an inclusive differential cross-section of a $D_s$ production with a consecutive decay to tau lepton in p-A interactions at the CERN-SPS. The measurement of DsTau will reduce the systematic uncertainty in tau neutrino interaction cross-section to $10\%$ level. The results from the pilot run and the prospect for physics runs in 2021-2022 will be discussed.
Probing proton PDFs at high x with LHCb

Thomas Boettcher

SciPost Phys. Proc. 8, 093 (2022) · published 13 July 2022 | · pdf

LHCb is a forward spectrometer at the LHC covering the pseudorapidity region 2<$\eta$<5. Because of this forward coverage, LHCb can probe the proton parton distribution functions (PDFs) in previously unexplored kinematic regimes, in particular at very high and low Bjorken-x. This contribution presents LHCb measurements that can be used to constrain the proton PDFs, with a focus on the high-x and high-$Q^2$ regime.

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