Eur. Phys. J. C (2008) 58: 251-259
https://doi.org/10.1140/epjc/s10052-008-0752-x

Regular Article - Theoretical Physics

B ⁻→K ₁ ^*− (1270)(→ρ ⁰ K ⁻)ℓ ⁺ ℓ ⁻ in LEET

¹ Center for Theoretical Physics, Jamia Millia University, Delhi, 110025, India
² Institut de Physique Nucléaire, Université de Lyon 1, 4 rue E. Fermi, 69622, Villeurbanne Cedex, France
³ Theory Division, KEK, 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan

^* e-mail: cornell@ipnl.in2p3.fr

Received: 5 December 2007
Revised: 26 August 2008
Published online: 14 October 2008

Abstract

Flavor changing neutral current (FCNC) decays of the B-meson are a very useful tool for studying possible physics scenarios beyond the standard model (SM), where of the many FCNC modes radiative, purely leptonic and semi-leptonic decays of the B-meson are relatively clean tests. Within this context, the BELLE collaboration has measured the process B→K ^* γ and also searched for the B→K ₁(1270)γ process. Theoretical analyses of these processes are yielding similar values of the relevant form factors. In this work we have used this upper bound in studying the angular correlations for the related semi-leptonic decay mode B ⁻→K ₁ ⁻ (1270)(→ρ ⁰ K ⁻)ℓ ⁺ ℓ ⁻, where we have used the form factors that have already been estimated for the B→K ₁(1270)γ mode. Note that the additional form factors that are required were calculated using large energy effective theory (LEET).