Right-handed currents in rare exclusive B→(K,K^*)νν¯ decays

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• 作者：Melikhov ; D. ; Nikitin ; N. ; Simula ; S.
• 关键词：13.20.He ; 12.39.Ki ; 12.60.-i ; Semileptonic decays of bottom mesons ; Relativistic quark models ; Extensions of the Standard Model
• 刊名：Physics Letters B
• 出版年：1998
• 出版时间：May 28, 1998
• 年：1998
• 卷：428
• 期：1-2
• 页码：171-178
• 全文大小：143 K

文摘

The effects of possible right-handed weak hadronic currents in rare exclusive semileptonic decays B→(K,K^*)νν¯ are investigated using a lattice-constrained dispersion quark model for the calculation of the relevant mesonic form factors. The results obtained for the branching ratios and the missing energy spectra are presented and the sensitivity of various observables to long-distance physics is investigated. It is shown that the asymmetry of transversely polarized K_T^* mesons as well as the K/K_T^* production ratio are only slightly sensitive to long-distance contributions and mostly governed by the relative strength and phase of right-handed currents. In particular, within the Standard Model the production of right-handed K_T^* mesons turns out to be largely suppressed with respect to left-handed ones, thanks to the smallness of the final to initial meson mass ratio. Therefore, the measurement of produced right-handed K_T^* mesons in rare B→K^*νν¯ decays offers a very interesting tool to investigate right-handed weak hadronic currents.