Charmless Bc⃗VV decays in the QCD factorization approach. (14th July 2017)

• Record Type: Journal Article
• Authors: Chang, Qin; Wang, Na; Sun, Junfeng; Han, Lin
• Is Part Of: Journal of physics. Volume 44:Number 8(2017:Aug.)
• Publication Date: 2017-07-14
• Subjects: Bc meson -- weak annihilation -- QCD factorization; Nuclear physics -- Periodicals; Particles (Nuclear physics) -- Periodicals; Physique nucléaire -- Périodiques; Particules (Physique nucléaire) -- Périodiques; Kernfysica; Elementaire deeltjes; 539.7
• DOI: 10.1088/1361-6471/aa7bca
• Languages: English
• ISSNs: 0954-3899

Abstract

Abstract: In this paper, we present a study of the charmless B c → VV ( V denotes the light ground SU ( 3 ) vector meson) decays within the framework of QCD factorization. In the evaluation, two different schemes for regulating the end-point divergence are adopted. One (scheme I) is to use a parameterization model, which is usually employed in the QCD factorization approach; the other (scheme II) is based on the infrared finite gluon propagator of the Cornwall prescription. It is found that, in the annihilation amplitudes, the end-point divergence appears only in the power-suppressed corrections related to the twist-3 distribution amplitudes of the V -meson. The strengths of the annihilation amplitudes evaluated in scheme II are generally larger than those in scheme I. Numerically, in the decay modes considered in this paper, the CKM-favored B c → ρ − ω, K * − K * 0 decays have relatively large branching fractions, ∼  ( 10 − 7 ), and hence are likely to be the first observed by future experiments. In addition, all of the decay modes are dominated by the longitudinal polarization state; numerically, f L ( B c → VV ) ≳ 99 % .