Lepton PDFs and multipurpose single-lepton searches at the LHC

Herbi K. Dreiner (Bethe Center for Theoretical Physics and Physikalisches Institut der Universität Bonn, Nußallee 12, 53115 Bonn, Germany) ; Víctor Martín Lozano (Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany; Departament de Física Teòrica and IFIC, Universitat de València-CSIC, E-46100 Burjassot, Spain) ; Saurabh Nangia (Bethe Center for Theoretical Physics and Physikalisches Institut der Universität Bonn, Nußallee 12, 53115 Bonn, Germany) ; Toby Opferkuch (Berkeley Center for Theoretical Physics, University of California, Berkeley, California 94720, USA; Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA; Theoretical Physics Department, CERN, Esplanade des Particules, 1211 Geneva 23, Switzerland)

A final state consisting of one charged lepton, at least one jet, and little missing transverse energy can be a very promising signature of new physics at the LHC across a wide range of models. However, it has received only limited attention so far. In this work we discuss the potential sensitivity of this channel to various new physics scenarios. To demonstrate our point, we consider its application to lepton parton distribution functions (PDFs) at the LHC in the context of supersymmetry. These lepton PDFs can lead to resonant squark production (similar to leptoquarks) via lepton number violating couplings present in R-parity violating supersymmetry (RPV-SUSY). Unlike leptoquarks, in RPV-SUSY there are many possible decay modes leading to a wide range of signatures. We propose two generic search regions: (a) a single first or second generation charged lepton, exactly 1 jet and low missing transverse energy, and (b) a single first or second generation charged lepton, at least 3 jets, and low missing transverse energy. We demonstrate that together these cover a large range of RPV-SUSY signatures, and have the potential to perform better than existing low-energy bounds, while being general enough to extend to a wide range of possible models hitherto not explored at the LHC.

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      "source": "APS", 
      "value": "A final state consisting of one charged lepton, at least one jet, and little missing transverse energy can be a very promising signature of new physics at the LHC across a wide range of models. However, it has received only limited attention so far. In this work we discuss the potential sensitivity of this channel to various new physics scenarios. To demonstrate our point, we consider its application to lepton parton distribution functions (PDFs) at the LHC in the context of supersymmetry. These lepton PDFs can lead to resonant squark production (similar to leptoquarks) via lepton number violating couplings present in <math><mi>R</mi></math>-parity violating supersymmetry (RPV-SUSY). Unlike leptoquarks, in RPV-SUSY there are many possible decay modes leading to a wide range of signatures. We propose two generic search regions: (a) a single first or second generation charged lepton, exactly 1 jet and low missing transverse energy, and (b) a single first or second generation charged lepton, at least 3 jets, and low missing transverse energy. We demonstrate that together these cover a large range of RPV-SUSY signatures, and have the potential to perform better than existing low-energy bounds, while being general enough to extend to a wide range of possible models hitherto not explored at the LHC."
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Published on:
13 February 2023
Publisher:
APS
Published in:
Physical Review D , Volume 107 (2023)
Issue 3
DOI:
https://doi.org/10.1103/PhysRevD.107.035011
arXiv:
2112.12755
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

Fulltext files: