Measurements of Rates, Asymmetries, and Angular Distributions in B -> K l+ l- and B -> K* l+ l- Decays

Hollar, Jonathan ; /SLAC /Wisconsin U., Madison

Stanford Linear Accelerator Center

关键词: Abundance;    Angular Distribution;    Polarization;    43 Particle Accelerators;    Storage Rings Experiment-Hep,Hepex;   

DOI  :  10.2172/891838
RP-ID  :  SLAC-R-840
RP-ID  :  AC02-76SF00515
RP-ID  :  891838

美国|英语

来源: UNT Digital Library

【 摘 要 】

This dissertation describes studies of the rare decays B{sub d} {yields} K{ell}{sup +}{ell}{sup -} and B{sub d} {yields} K*{ell}{sup +}{ell}{sup -}, where {ell}{sup +}{ell}{sup -} is either an e{sup +}e{sup -} or a {mu}{sup +}{mu}{sup -} pair. These decays are highly suppressed in the Standard Model, and could be strongly affected by physics beyond the Standard Model. The authors measure the total branching fractions {Beta}(B{sub d} {yields} K{ell}{sup +}{ell}{sup -}) = (0.34 {+-} 0.07 {+-} 0.03) x 10{sup -6}, {Beta}(B{sub d} {yields} K*{ell}{sup +}{ell}{sup -}) = (0.78{sub -0.17}{sup +0.19} {+-} 0.12) x 10{sup -6}. In addition, they measure the partial branching fractions, relative abundance of muons to electrons, direct CP asymmetry, dilepton forward-backward asymmetry, and longitudinal polarization of the K* in these modes. They also search for the lepton flavor-violating decays B{sub d} {yields} Ke{sup {+-}}{mu}{sup {-+}} and B{sub d} {yields} K*e{sup {+-}}{mu}{sup {-+}}. The measurements were performed at the SLAC PEP II storage ring running at the {Upsilon}(4S) resonance.