Abstract
Besides the traditional strong and electromagnetic decay modes,Υ(nS)meson can also decay through the weak interactions within the standard model of elementary particle. With anticipation of copiousΥ(nS)data samples at the running LHC and coming SuperKEKB experiments, the two-body nonleptonic bottom-changingΥ(nS)→Bc⁎π,Bc⁎Kdecays (n=1,2,3) are investigated with perturbative QCD approach firstly. The absolute branching ratios forΥ(nS)→Bc⁎πandBc⁎Kdecays are estimated to reach up to about10-10and10-11, respectively, which might possibly be measured by the future experiments.
Highlights
IntroductionThe bottom-changing Υ(nS) decays can occur only via the weak interactions within the standard model, with tiny incidence probability
The upsilon Υ(nS) meson is the spin-triplet S-wave state of bottomonium with well-established quantum number of IGJPC = 0−1−− [1]
The upsilon weak decay permits one to further constrain parameters obtained from B meson decay, and cross comparisons provide an opportunity to test various phenomenological models
Summary
The bottom-changing Υ(nS) decays can occur only via the weak interactions within the standard model, with tiny incidence probability Both constituent quarks of upsilons can decay individually, which provide an alternative system for investigating the weak decay of heavy-flavored hadrons. We will study the nonleptonic Υ(nS) → Bc∗P (P = π and K) weak decays with perturbative QCD (pQCD) approach [2,3,4]. The upsilon weak decay permits one to further constrain parameters obtained from B meson decay, and cross comparisons provide an opportunity to test various phenomenological models. We will present a phenomenological investigation on Υ(nS) → Bc∗P weak decay with the pQCD approach to supply a ready reference for the future experiments.
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