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Lepton flavor violation and dilepton tails at the LHC


Angelescu, Andrei; Faroughy, Darius A; Sumensari, Olcyr (2020). Lepton flavor violation and dilepton tails at the LHC. European Physical Journal C - Particles and Fields, 80(7):641.

Abstract

Starting from a general effective Lagrangian for lepton flavor violation (LFV) in quark-lepton transitions, we derive constraints on the effective coefficients from the high-mass tails of the dilepton processes pp→ℓkℓl (with k≠l). The current (projected) limits derived in this paper from LHC data with 36 fb−1 (3 ab−1) can be applied to generic new physics scenarios, including the ones with scalar, vector and tensor effective operators. For purely left-handed operators, we explicitly compare these LHC constraints with the ones derived from flavor-physics observables, illustrating the complementarity of these different probes. While flavor physics is typically more constraining for quark-flavor violating operators, we find that LHC provides the most stringent limits on several flavor-conserving ones. Furthermore, we show that dilepton tails offer the best probes for charm-quark transitions at current luminosities and that they provide competitive limits for tauonic b→d transitions at the high-luminosity LHC phase. As a by-product, we also provide general numerical expressions for several low-energy LFV processes, such as the semi-leptonic decays K→πℓ±kℓ∓l, B→πℓ±kℓ∓l and B→K(∗)ℓ±kℓ∓l.

Abstract

Starting from a general effective Lagrangian for lepton flavor violation (LFV) in quark-lepton transitions, we derive constraints on the effective coefficients from the high-mass tails of the dilepton processes pp→ℓkℓl (with k≠l). The current (projected) limits derived in this paper from LHC data with 36 fb−1 (3 ab−1) can be applied to generic new physics scenarios, including the ones with scalar, vector and tensor effective operators. For purely left-handed operators, we explicitly compare these LHC constraints with the ones derived from flavor-physics observables, illustrating the complementarity of these different probes. While flavor physics is typically more constraining for quark-flavor violating operators, we find that LHC provides the most stringent limits on several flavor-conserving ones. Furthermore, we show that dilepton tails offer the best probes for charm-quark transitions at current luminosities and that they provide competitive limits for tauonic b→d transitions at the high-luminosity LHC phase. As a by-product, we also provide general numerical expressions for several low-energy LFV processes, such as the semi-leptonic decays K→πℓ±kℓ∓l, B→πℓ±kℓ∓l and B→K(∗)ℓ±kℓ∓l.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Engineering (miscellaneous)
Physical Sciences > Physics and Astronomy (miscellaneous)
Uncontrolled Keywords:Physics and Astronomy (miscellaneous), Engineering (miscellaneous)
Language:English
Date:1 July 2020
Deposited On:12 Aug 2020 14:58
Last Modified:13 Aug 2020 20:00
Publisher:Springer
ISSN:1434-6044
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1140/epjc/s10052-020-8210-5
Project Information:
  • : FunderH2020
  • : Grant ID674896
  • : Project TitleELUSIVES - The Elusives Enterprise: Asymmetries of the Invisible Universe

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