Mini-review of rare charmonium decays at BESIII

Abstract

Recently, LHCb experiment announced a 3.5σ evidence for direct CP violation in D 0 decay by looking at the difference between ACP (D 0 → K + K − ) and ACP (D 0 → π + π − ). This is the first evidence of CP violation in charm system, which may indicate new physics beyond the Standard Model. Motivated by this measurement, we review rare processes in charmonium decay, especially, the weak decay, C or P violated decay and lepton flavor violated decays. In case the new physics appears in charm sector, these rare decays of charmonium states will provide opportunity to search for significant contributions from physics beyond the Standard Model. With huge J/ψ and ψ(2S) samples in BESIII experiment, the rare decays may be feasible.

Search forηandη′→π+e−ν¯eAblikim1, Ачасов2, Albayrak3 et al. 2013Phys. Rev. D10000View full textAdd to dashboardCite

“…The reason for the expected sensitivity is that the rates of the quarkonium weak decays are expected to be tiny in the framework of the SM [7]. As originally pointed out by Singer [8], the weak decays η → π + l −ν l (l = e, µ, and charge conjugate state implicitly included) are purely second class with a vector-type coupling in the SM (see Ref.…”

J/ψ→Ds,dπ,DSun1, Yang2, Chang3 et al. 2016Phys. Rev. D6050View full textAdd to dashboardCite

“…A large amount of J/ψ data samples have been accumulated. It is promisingly expected to produce about 10 10 J/ψ samples at BESIII per year with the designed luminosity [11], and over 10 10 prompt J/ψ samples at LHCb per f b −1 data [12]. It is not utopian to carefully scrutinize the J/ψ weak decays at the high-luminosity dedicated experiments in the future.…”

J/ψ → DP, DV decays in the QCD factorization approach

“…It is hopefully expected to produce about 10 10 J/ψ events at BESIII per year of data taking with the designed luminosity [16], and over 10 10 prompt J/ψ events at LHCb per f b −1 data [17]. The availability of such large samples enables a realistic possibility to explore experimentally the nonleptonic J/ψ weak decays, so the corresponding theoretical studies are very necessary to provide a ready reference.…”