https://doi.org/10.1140/epjc/s10052-015-3801-2
Regular Article - Theoretical Physics
Prospects of discovering new physics in rare charm decays
1
Department of Physics, University of Ljubljana, Jadranska 19, 1000, Ljubljana, Slovenia
2
J. Stefan Institute, Jamova 39, P. O. Box 3000, 1001, Ljubljana, Slovenia
* e-mail: nejc.kosnik@ijs.si
Received:
28
October
2015
Accepted:
19
November
2015
Published online:
30
November
2015
The LHCb bounds on the branching ratio of the rare decay 
and the constraints on the branching ratio of 
in the nonresonant regions enable us to improve constraints on new physics contributions. Using the effective Lagrangian approach we determine the sizes of the Wilson coefficients allowed by the existing LHCb bounds on rare charm decays. Then we discuss contributions to rare charm meson decay observables in several models of new physics: a model with an additional spin-1 weak triplet, leptoquark models, Two Higgs doublets model of type III, and a 
model. Here we complement the discussion by 
–
oscillations data. Among the considered models, only leptoquarks can significantly modify the Wilson coefficients. Assuming that the differential decay width for receives a NP contribution, while the differential decay width for 
is Standard Model-like, we find that lepton flavor universality can be violated and might be observed at high dilepton invariant mass.
© The Author(s), 2015
