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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of neutral Z ` boson in B-s -> phi l(+)l(-) decay with polarized phi and the unpolarized and polarized CP violation asymmetry

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Ahmed, Ishtiaq [1, 2] ; Aslam, M. Jamil [2] ; Paracha, M. Ali [3, 4]
Total Authors: 3
[1] Natl Ctr Phys, Islamabad 45320 - Pakistan
[2] Quaid I Azam Univ, Dept Phys, Islamabad 45320 - Pakistan
[3] Univ Cruzeiro Sul, Lab Fis Teor & Computac, BR-01506000 Sao Paulo - Brazil
[4] Natl Univ Sci & Technol, Ctr Adv Math & Phys, Islamabad 44000 - Pakistan
Total Affiliations: 4
Document type: Journal article
Source: Physical Review D; v. 89, n. 1 JAN 16 2014.
Web of Science Citations: 4

The effects of the new neutral Z' boson in B-s -> phi l(+)l(-), when phi is longitudinal or transverse polarized, are studied. In addition, the implications of the Z' boson on the unpolarized and polarized CP violation asymmetries, with reference to leptons, are also presented. It is observed that the branching ratio with polarized phi is quite sensitive to the Z' contributions which are coming through the modification of the Wilson coefficients C-9(eff) and C-10. Moreover, the off-diagonal elements of the chiral Z' couplings contain a new weak phase phi(sb) that provides a new source of CP violation. Keeping in view that in the flavor-changing neutral-current transitions, the CP-violation asymmetries are highly suppressed in the Standard Model, we have studied the unpolarized and polarized CP-violation asymmetries in B-s -> phi l(+)l(-) decays. Our results indicate that these CP-violation asymmetries are remarkably significant and can give us hints of any new physics coming through the Z' boson. It is hoped that accurate measurements of these asymmetries will not only help us to establish NP but also give us a chance to determine the precise values of the coupling parameters of the Z' boson. (AU)

FAPESP's process: 12/13047-2 - Physics beyond the standard model and nonperturbative aspects in rare semi-leptonic b decays
Grantee:Muhammad Ali Paracha
Support type: Scholarships in Brazil - Post-Doctorate