Abstract
We investigate asymmetric leptoquark pair production mechanism at the Large Hadron Collider to advocate its potential relevance to establish reliable constraints on the leptoquark parameter space and its ability to aid in correct identification of these attractive sources of new physics. The main feature of asymmetric pair production that genuinely distinguishes it from the usual leptoquark pair production is given by the fact that the two leptoquarks that are produced in proton-proton collisions through a t-channel lepton exchange are not charge conjugates of each other. Hence the proposed name of asymmetric leptoquark pair production for this type of process. We spell out prerequisite conditions for the asymmetric leptoquark pair production mechanism to be operational and enumerate all possible combinations of leptoquark multiplets that can potentially generate it. We finally reinterpret existing leptoquark pair production search results within several simple scalar leptoquark extensions of the Standard Model, assuming that the leptoquarks exclusively couple to either electrons or muons and the first generation quarks, to demonstrate proper inclusion of asymmetric pair production. We consequently present accurate parameter space constraints for the S1, S3, R2, S1+S3, and S1+R2 leptoquark scenarios.
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ATLAS collaboration, Search for pairs of scalar leptoquarks decaying into quarks and electrons or muons in \( \sqrt{s} \) = 13 TeV pp collisions with the ATLAS detector, JHEP 10 (2020) 112 [arXiv:2006.05872] [INSPIRE].
ATLAS collaboration, Search for pair production of scalar leptoquarks decaying into first- or second-generation leptons and top quarks in proton–proton collisions at \( \sqrt{s} \) = 13 TeV with the ATLAS detector, Eur. Phys. J. C 81 (2021) 313 [arXiv:2010.02098] [INSPIRE].
CMS collaboration, Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, Phys. Lett. B 819 (2021) 136446 [arXiv:2012.04178] [INSPIRE].
ATLAS collaboration, Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at \( \sqrt{s} \) = 13 TeV with the ATLAS detector, JHEP 06 (2021) 179 [arXiv:2101.11582] [INSPIRE].
CMS collaboration, The search for a third-generation leptoquark coupling to a τ lepton and a b quark through single, pair and nonresonant production at \( \sqrt{s} \) = 13 TeV, CMS-PAS-EXO-19-016 (2022).
M. Kramer, T. Plehn, M. Spira and P.M. Zerwas, Pair production of scalar leptoquarks at the Tevatron, Phys. Rev. Lett. 79 (1997) 341 [hep-ph/9704322] [INSPIRE].
M. Kramer, T. Plehn, M. Spira and P.M. Zerwas, Pair production of scalar leptoquarks at the CERN LHC, Phys. Rev. D 71 (2005) 057503 [hep-ph/0411038] [INSPIRE].
T. Mandal, S. Mitra and S. Seth, Pair Production of Scalar Leptoquarks at the LHC to NLO Parton Shower Accuracy, Phys. Rev. D 93 (2016) 035018 [arXiv:1506.07369] [INSPIRE].
I. Doršner and A. Greljo, Leptoquark toolbox for precision collider studies, JHEP 05 (2018) 126 [arXiv:1801.07641] [INSPIRE].
W. Beenakker, C. Borschensky, M. Krämer, A. Kulesza and E. Laenen, NNLL-fast: predictions for coloured supersymmetric particle production at the LHC with threshold and Coulomb resummation, JHEP 12 (2016) 133 [arXiv:1607.07741] [INSPIRE].
W. Beenakker, M. Kramer, T. Plehn, M. Spira and P.M. Zerwas, Stop production at hadron colliders, Nucl. Phys. B 515 (1998) 3 [hep-ph/9710451] [INSPIRE].
W. Beenakker, S. Brensing, M. Kramer, A. Kulesza, E. Laenen and I. Niessen, Supersymmetric top and bottom squark production at hadron colliders, JHEP 08 (2010) 098 [arXiv:1006.4771] [INSPIRE].
W. Beenakker, C. Borschensky, R. Heger, M. Krämer, A. Kulesza and E. Laenen, NNLL resummation for stop pair-production at the LHC, JHEP 05 (2016) 153 [arXiv:1601.02954] [INSPIRE].
C. Borschensky, B. Fuks, A. Kulesza and D. Schwartländer, Scalar leptoquark pair production at hadron colliders, Phys. Rev. D 101 (2020) 115017 [arXiv:2002.08971] [INSPIRE].
A. Alves, O. Eboli and T. Plehn, Stop lepton associated production at hadron colliders, Phys. Lett. B 558 (2003) 165 [hep-ph/0211441] [INSPIRE].
I. Dorsner, S. Fajfer and A. Greljo, Cornering Scalar Leptoquarks at LHC, JHEP 10 (2014) 154 [arXiv:1406.4831] [INSPIRE].
J.B. Hammett and D.A. Ross, NLO Leptoquark Production and Decay: The Narrow-Width Approximation and Beyond, JHEP 07 (2015) 148 [arXiv:1501.06719] [INSPIRE].
T. Mandal, S. Mitra and S. Seth, Single Productions of Colored Particles at the LHC: An Example with Scalar Leptoquarks, JHEP 07 (2015) 028 [arXiv:1503.04689] [INSPIRE].
M. Schmaltz and Y.-M. Zhong, The leptoquark Hunter’s guide: large coupling, JHEP 01 (2019) 132 [arXiv:1810.10017] [INSPIRE].
D.A. Faroughy, A. Greljo and J.F. Kamenik, Confronting lepton flavor universality violation in B decays with high-pT tau lepton searches at LHC, Phys. Lett. B 764 (2017) 126 [arXiv:1609.07138] [INSPIRE].
N. Raj, Anticipating nonresonant new physics in dilepton angular spectra at the LHC, Phys. Rev. D 95 (2017) 015011 [arXiv:1610.03795] [INSPIRE].
A. Greljo and D. Marzocca, High-pT dilepton tails and flavor physics, Eur. Phys. J. C 77 (2017) 548 [arXiv:1704.09015] [INSPIRE].
S. Bansal, R.M. Capdevilla, A. Delgado, C. Kolda, A. Martin and N. Raj, Hunting leptoquarks in monolepton searches, Phys. Rev. D 98 (2018) 015037 [arXiv:1806.02370] [INSPIRE].
J. Fuentes-Martin, A. Greljo, J. Martin Camalich and J.D. Ruiz-Alvarez, Charm physics confronts high-pT lepton tails, JHEP 11 (2020) 080 [arXiv:2003.12421] [INSPIRE].
L. Allwicher, D.A. Faroughy, F. Jaffredo, O. Sumensari and F. Wilsch, Drell-Yan Tails Beyond the Standard Model, arXiv:2207.10714 [INSPIRE].
J. Ohnemus, S. Rudaz, T.F. Walsh and P.M. Zerwas, Single leptoquark production at hadron colliders, Phys. Lett. B 334 (1994) 203 [hep-ph/9406235] [INSPIRE].
O.J.P. Eboli, R. Zukanovich Funchal and T.L. Lungov, Signal and backgrounds for leptoquarks at the CERN LHC, Phys. Rev. D 57 (1998) 1715 [hep-ph/9709319] [INSPIRE].
L. Buonocore, U. Haisch, P. Nason, F. Tramontano and G. Zanderighi, Lepton-Quark Collisions at the Large Hadron Collider, Phys. Rev. Lett. 125 (2020) 231804 [arXiv:2005.06475] [INSPIRE].
A. Greljo and N. Selimovic, Lepton-Quark Fusion at Hadron Colliders, precisely, JHEP 03 (2021) 279 [arXiv:2012.02092] [INSPIRE].
L. Buonocore et al., Resonant leptoquark at NLO with POWHEG, JHEP 11 (2022) 129 [arXiv:2209.02599] [INSPIRE].
I. Doršner, S. Fajfer and A. Lejlić, Novel Leptoquark Pair Production at LHC, JHEP 05 (2021) 167 [arXiv:2103.11702] [INSPIRE].
C. Borschensky, B. Fuks, A. Jueid and A. Kulesza, Scalar leptoquarks at the LHC and flavour anomalies: a comparison of pair-production modes at NLO-QCD, JHEP 11 (2022) 006 [arXiv:2207.02879] [INSPIRE].
I. Doršner, S. Fajfer, A. Greljo, J.F. Kamenik and N. Košnik, Physics of leptoquarks in precision experiments and at particle colliders, Phys. Rept. 641 (2016) 1 [arXiv:1603.04993] [INSPIRE].
A. Alloul, N.D. Christensen, C. Degrande, C. Duhr and B. Fuks, FeynRules 2.0 — A complete toolbox for tree-level phenomenology, Comput. Phys. Commun. 185 (2014) 2250 [arXiv:1310.1921] [INSPIRE].
J. Alwall et al., The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations, JHEP 07 (2014) 079 [arXiv:1405.0301] [INSPIRE].
NNPDF collaboration, Parton distributions for the LHC Run II, JHEP 04 (2015) 040 [arXiv:1410.8849] [INSPIRE].
C. Borschensky, B. Fuks, A. Kulesza and D. Schwartländer, Scalar leptoquark pair production at the LHC: precision predictions in the era of flavour anomalies, JHEP 02 (2022) 157 [arXiv:2108.11404] [INSPIRE].
P. Langacker, Parity violation in muonic atoms and cesium, Phys. Lett. B 256 (1991) 277 [INSPIRE].
Qweak collaboration, Precision measurement of the weak charge of the proton, Nature 557 (2018) 207 [arXiv:1905.08283] [INSPIRE].
V.D. Barger and K.-m. Cheung, Atomic parity violation, leptoquarks, and contact interactions, Phys. Lett. B 480 (2000) 149 [hep-ph/0002259] [INSPIRE].
A. Crivellin, D. Müller and L. Schnell, Combined constraints on first generation leptoquarks, Phys. Rev. D 103 (2021) 115023 [arXiv:2104.06417] [Addendum ibid. 104 (2021) 055020] [INSPIRE].
Particle Data Group collaboration, Review of Particle Physics, PTEP 2020 (2020) 083C01 [INSPIRE].
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Doršner, I., Lejlić, A. & Saad, S. Asymmetric leptoquark pair production at LHC. J. High Energ. Phys. 2023, 25 (2023). https://doi.org/10.1007/JHEP03(2023)025
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DOI: https://doi.org/10.1007/JHEP03(2023)025