Semileptonic decays B/B$_s$→(η,η′,G)(l$^+$l$^-$,l$\bar{ν}$,$ν\bar{ν}$ in the perturbative QCD approach beyond the leading order

In this paper we make a systematic study of the semileptonic decays B/Bs→(η,η′,G)(l+l-,lν¯,νν¯) by employing the perturbative QCD (pQCD) factorization approach. The next-to-leading-order (NLO) contributions to the relevant form factors are included, and the ordinary η-η′ mixing scheme and the η-η′-G mixing scheme are considered separately, where G denotes a pseudoscalar glueball. The numerical results and the phenomenological analysis indicate that (a) the NLO contributions to the relevant form factors provide 25% enhancement to the leading-order pQCD predictions for the branching ratios Br(B-→η(′)l-ν¯l), leading to a good agreement between the predictions and the data; (b) for all considered decays, the pQCD results are basically consistent with those from other different theoretical models; (c) the pQCD predictions in the two considered mixing schemes agree well with each other within theoretical errors. The outcomes presented here can be tested by LHCb and forthcoming Super-B experiments.

Note:

8 pages, 1 figure. Published in Phys.Rev. D87, 097501 (2013)

12.38.Bx
13.20.He
14.40.Nd
quantum chromodynamics: perturbation theory
higher-order: 1
mixing
glueball
form factor
B: semileptonic decay
B/s: semileptonic decay

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Semileptonic decays B/Bs_ss​→(η,η′,G)(l+^++l−^-−,lνˉ\bar{ν}νˉ,ννˉν\bar{ν}ννˉ in the perturbative QCD approach beyond the leading order

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Semileptonic decays B/B $_s$ →(η,η′,G)(l $^+$ l $^-$ ,l $\bar{ν}$ , $ν\bar{ν}$ in the perturbative QCD approach beyond the leading order