期刊
EUROPEAN PHYSICAL JOURNAL C
卷 80, 期 7, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-020-8210-5
关键词
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资金
- European Union [674896]
- University of Nebraska-Lincoln
- NSF Nebraska EPSCoR [OIA-1557417]
- Swiss National Science Foundation (SNF) [200021-159720]
- National Science Foundation [PHY-1820891]
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 -> l(k)l(l) (with k not equal 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 -> pi l(k)(+/-)l(l)(-/+), B -> pi l(k)(+/-)l(l)(-/+) and B -> K(*)l(k)(+/-)l(l)(-/+).
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