K1(1270)-K1(1400) mixing and the fourth generation standard model effects in B → K1l+l- decays

被引：15

作者：

Ahmed, Aqeel ^{[1
]}

Ahmed, Ishtiaq ^{[1
,2
]}

Paracha, M. Ali ^{[1
,2
]}

Rehman, Abdur ^{[1
]}

机构：

[1] Natl Ctr Phys, Islamabad 45320, Pakistan

[2] Quaid I Azam Univ, Dept Phys, Islamabad 45320, Pakistan

来源：

PHYSICAL REVIEW D | 2011年 / 84卷 / 03期

关键词：

FORWARD-BACKWARD ASYMMETRY; LEPTON POLARIZATION ASYMMETRY; CP VIOLATION; QCD FACTORIZATION; WEAK-INTERACTIONS; SHORT-DISTANCE; QUARK; FAMILY; RESONANCE; BREAKING;

D O I：

10.1103/PhysRevD.84.033010

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The implications of the fourth-generation quarks in the B -> K-1(1270, 1400)l(+)l(-) with l = mu, tau decays are studied, where the mass eigenstates K-1(1270) and K-1(1400) are the mixture of P-1(1) and P-3(1) states with the mixing angle theta(K). In this context, we have studied various observables like branching ratio (BR), forward-backward asymmetry (A(FB)) and longitudinal and transverse helicity fractions (f(L,T)) of K-1 meson in B -> K(1)l(+)l(-) decays. To study these observables, we have used the light-cone QCD sum rules form factors and set the mixing angle theta(K) = -34 degrees. It is noticed that the BR is suppressed for K-1(1400) as a final state meson compared to that of K-1(1270). Same is the case when the final state leptons are tauons rather than muons. In both the situations, all the above mentioned observables are quite sensitive to the fourth-generation effects. Hence the measurements of these observables at LHC, for the above mentioned processes can serve as a good tool to investigate the indirect searches for the existence of fourth-generation quarks.

引用

页数：18

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