Charm physics confronts high- p T lepton tails
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Springer
Received: April 7, Revised: September 15, Accepted: October 12, Published: November 17,
2020 2020 2020 2020
Charm physics confronts high-pT lepton tails
a
Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland b CERN, Theoretical Physics Department, CH-1211 Geneva 23, Switzerland c Instituto de Astrofísica de Canarias, C/ Vía Láctea, s/n E38205, La Laguna, Tenerife, España d Universidad de La Laguna, Departamento de Astrofísica, La Laguna, Tenerife, Spain e Instituto de Física, Universidad de Antioquia, A.A. 1226 Medellín, Colombia
E-mail: [email protected], [email protected], [email protected], [email protected] Abstract: We present a systematic survey of possible short-distance new-physics effects in (semi)leptonic charged- and neutral-current charmed meson decays. Using the Standard Model Effective Field Theory (SMEFT) to analyze the most relevant experimental data at low and high energies, we demonstrate a striking complementarity between charm decays and high invariant mass lepton tails at the LHC. Interestingly enough, high-pT Drell-Yan data offer competitive constraints on most new physics scenarios. Furthermore, the full set of correlated constraints from K, π and τ decays imposed by SU(2)L gauge invariance is considered. The bounds from D(s) decays, high-pT lepton tails and SU(2)L relations chart the space of the SMEFT affecting semi(leptonic) charm flavor transitions. Keywords: Beyond Standard Model, Heavy Quark Physics ArXiv ePrint: 2003.12421
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP11(2020)080
JHEP11(2020)080
Javier Fuentes-Martín,a Admir Greljo,b Jorge Martin Camalichc,d and José David Ruiz-Alvareze
Contents 1
2 Theoretical framework: c → di e¯α ν β 2.1 The high-energy effective theory 2.2 The low-energy effective theory
3 3 4
3 Decays of charmed mesons
5
4 High-pT lepton production at the LHC 4.1 Short-distance new physics in high-pT tails 4.2 Recast of the existing experimental searches 4.3 Possible caveats within and beyond the EFT
8 8 10 12
5 Interplay between low and high energy 5.1 Four-fermion interactions 5.2 W vertex corrections
14 14 16
6 Neutral currents 6.1 Theoretical framework: c → u eα e¯β 6.2 Rare charm decays 6.3 High-pT dilepton tails 6.4 Comments on ∆S = 1 and ∆B = 1 rare transitions
17 17 18 20 22
7 Constraints from SU(2)L gauge invariance 7.1 Charged currents 7.2 Neutral currents
23 24 26
8 Conclusions
27
1
Introduction
Understanding flavor transitions in the up-quark sector may prove crucial for unraveling the flavor puzzle and unveiling physics beyond the Standard Model (SM). A promising line in this direction is the investigation of transitions involving charmed hadrons. The recent discovery of direct CP violation in D mesons decays [1] illustrates the maturity of this field and its potential to lead to new discoveries in the near future. In fact, an unprecedented amount of data on charm decays is expected to be collected at BES III [2], LHCb [3] and Belle II [4] experim
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