skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Exclusive B{yields}{rho}l{sup +}l{sup -} decay and polarized lepton pair forward-backward asymmetries

Abstract

The polarized lepton pair forward-backward asymmetries in B{yields}{rho}l{sup +}l{sup -} decay using a general, model independent form of the four-Fermi interaction is studied. The general expressions for nine double-lepton polarization forward-backward asymmetries are calculated. The study of the forward-backward asymmetries of the doubly polarized lepton pair proves to be a very useful tool in looking for new physics beyond the standard model.

Authors:
; ;  [1]
  1. Physics Department, Middle East Technical University, 06531 Ankara (Turkey)
Publication Date:
OSTI Identifier:
20776655
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevD.73.034013; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; B MESONS; FERMI INTERACTIONS; LEPTONS; POLARIZATION; SEMILEPTONIC DECAY; STANDARD MODEL

Citation Formats

Aliev, T.M., Bashiry, V., and Savci, M. Exclusive B{yields}{rho}l{sup +}l{sup -} decay and polarized lepton pair forward-backward asymmetries. United States: N. p., 2006. Web. doi:10.1103/PhysRevD.73.034013.
Aliev, T.M., Bashiry, V., & Savci, M. Exclusive B{yields}{rho}l{sup +}l{sup -} decay and polarized lepton pair forward-backward asymmetries. United States. doi:10.1103/PhysRevD.73.034013.
Aliev, T.M., Bashiry, V., and Savci, M. Wed . "Exclusive B{yields}{rho}l{sup +}l{sup -} decay and polarized lepton pair forward-backward asymmetries". United States. doi:10.1103/PhysRevD.73.034013.
@article{osti_20776655,
title = {Exclusive B{yields}{rho}l{sup +}l{sup -} decay and polarized lepton pair forward-backward asymmetries},
author = {Aliev, T.M. and Bashiry, V. and Savci, M.},
abstractNote = {The polarized lepton pair forward-backward asymmetries in B{yields}{rho}l{sup +}l{sup -} decay using a general, model independent form of the four-Fermi interaction is studied. The general expressions for nine double-lepton polarization forward-backward asymmetries are calculated. The study of the forward-backward asymmetries of the doubly polarized lepton pair proves to be a very useful tool in looking for new physics beyond the standard model.},
doi = {10.1103/PhysRevD.73.034013},
journal = {Physical Review. D, Particles Fields},
number = 3,
volume = 73,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2006},
month = {Wed Feb 01 00:00:00 EST 2006}
}
  • We investigate the influence of the fourth-generation quarks on the asymmetries for unpolarized and polarized leptons in B{yields}K*l{sup +}l{sup -} decay. We obtain that for both ({mu}, {tau}) channels the magnitudes of the differential forward-backward (FB) asymmetries and the average forward-backward asymmetries are quite sensitive to the fourth-generation quarks' mass and mixing parameters. We also achieve that, among the double lepton polarization FB asymmetries, just longitudinally polarized leptons' FB asymmetry shows considerable discrepancy with respect to the third-generation standard model. Moreover, we find that longitudinally polarized leptons' FB asymmetry and its variation with new fourth-generation standard model parameters coincide withmore » unpolarized FB when the lepton mass vanishes. The study of FB asymmetries can serve as a good tool to search for new-physics effects, precisely, to search for the fourth-generation quarks (t{sup '}, b{sup '}) via its indirect manifestations in the loop diagrams.« less
  • We study the double-lepton polarization asymmetries and single and double-lepton polarization forward-backward asymmetries of the rare b{yields}sl{sup +}l{sup -} mode within the standard model and in the Appelquist-Cheng-Dobrescu model, which is a new physics scenario with a single universal extra dimension. In particular, we examine the sensitivity of the observables to the radius R of the compactified extra dimension, which is the new parameter in this new physics model.
  • The double-lepton polarization asymmetries in B{yields}{rho}l{sup +}l{sup -} decay are analyzed in a model independent framework. The general expressions for nine double-polarization asymmetries are calculated. It is shown that the study of the double-lepton polarization asymmetries proves to be a very useful tool in looking for new physics beyond the standard model.
  • We study the forward-backward and the CP-violating asymmetries (both time independent and time dependent) in rare semileptonic B{sub d{yields}{rho}}{sup 0}l{sup +}l{sup -}, B{sub s{yields}{phi}}l{sup +}l{sup -}, and radiative leptonic B{sub d,s{yields}{gamma}}l{sup +}l{sup -} decays and investigate the sensitivity of these asymmetries to the extensions of the standard model.
  • We analyze the B{yields}K{sub 2}*({yields}K{pi})l{sup +}l{sup -} (with l=e, {mu}, {tau}) decay in the standard model and two new physics scenarios: the vectorlike quark model and family nonuniversal Z{sup '} models. We derive the differential angular distributions using the recently calculated form factors in the perturbative QCD approach. Branching ratios, polarizations, forward-backward asymmetries, and transversity amplitudes are predicted, from which we find a promising prospective to observe this channel in future experiments. We update the constraints on effective Wilson coefficients and/or free parameters in these two new physics scenarios by making use of the B{yields}K*l{sup +}l{sup -} and b{yields}sl{sup +}l{supmore » -} experimental data. Their impact on B{yields}K{sub 2}*l{sup +}l{sup -} is subsequently explored and, in particular, the zero-crossing point for the forward-backward asymmetry in these new physics scenarios can sizably deviate from the standard model. In addition we also generalize the analysis to a similar mode, B{sub s}{yields}f{sub 2}{sup '}(1525)({yields}K{sup +}K{sup -})l{sup +}l{sup -}.« less