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Title: Lepton Universality Test in Upsilon(1S) Decays at BaBar

Lepton Universality Test in Upsilon(1S) Decays at BaBar Using a sample of 122 million {Upsilon}(3S) decays collected with the BABAR detector at the PEP-II asymmetric energy collider at the SLAC National Accelerator Laboratory, we measure the ratio R{sub {tau}{mu}} = BR({Upsilon}(1S) {yields} {tau}{sup +}{tau}{sup -})/BR({Upsilon}(1S) {yields} {mu}{sup +}{mu}{sup -}); the measurement is intended as a test of lepton universality and as a possible search for a light pseudoscalar Higgs boson in Next to Minimal Supersymmetric Standard Model (NMSSM) scenarios. Such a boson could appear in a deviation of the ratio R{sub {tau}{mu}} from the Standard Model expectation, that is 1, except for small lepton mass corrections. The analysis exploits the decays {Upsilon}(3S) {yields} {Upsilon}(1S){pi}{sup +}{pi}{sup -}, {Upsilon}(1S) {yields} l{sup +}l{sup -}, where l = {mu},{tau}.
Authors: ;
Publication Date:
OSTI Identifier:OSTI ID: 1038433
Report Number(s):SLAC-PUB-14946
arXiv:0910.0423; TRN: US1201866
DOE Contract Number:AC02-76SF00515
Resource Type:Conference
Resource Relation:Conference: To appear in the proceedings of Meeting of the Division of Particles and Fields of the American Physical Society (DPF 2009), Detroit, Michigan, 26-31 Jul 2009
Research Org:SLAC National Accelerator Laboratory (SLAC)
Sponsoring Org:USDOE
Country of Publication:United States
Language:English
Subject: 43 PARTICLE ACCELERATORS; BOSONS; FERMILAB ACCELERATOR; HIGGS BOSONS; LEPTONS; PHYSICS; PSEUDOSCALARS; STANDARD MODEL; STANFORD LINEAR ACCELERATOR CENTER; DECAY; PARTICLES Experiment-HEP,HEPEX