The ratio Rτμ(Υ(1S))=ΓΥ(1S)→τ +τ-/ΓΥ(1S)→μ+μ - is measured using a sample of (121.8±1.2) ×106Υ(3S) events recorded by the BABAR detector. This measurement is intended as a test of lepton universality and as a search for a possible light pseudoscalar Higgs boson. In the standard model (SM) this ratio is expected to be close to 1. Any significant deviations would violate lepton universality and could be introduced by the coupling to a light pseudoscalar Higgs boson. The analysis studies the decays Υ(3S)→Υ(1S)π+π -, Υ(1S)→l+l-, where l=μ, τ. The result, Rτμ(Υ(1S))=1.005±0.013(stat)±0.022(syst), shows no deviation from the expected SM value, while improving the precision with respect to previous measurements.

Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2010). Test of Lepton universality in ΓΥ(1S) decays at BABAR. PHYSICAL REVIEW LETTERS, 104(19) [10.1103/PhysRevLett.104.191801].

Test of Lepton universality in ΓΥ(1S) decays at BABAR

CARPINELLI, Massimo
Membro del Collaboration Group
;
2010

Abstract

The ratio Rτμ(Υ(1S))=ΓΥ(1S)→τ +τ-/ΓΥ(1S)→μ+μ - is measured using a sample of (121.8±1.2) ×106Υ(3S) events recorded by the BABAR detector. This measurement is intended as a test of lepton universality and as a search for a possible light pseudoscalar Higgs boson. In the standard model (SM) this ratio is expected to be close to 1. Any significant deviations would violate lepton universality and could be introduced by the coupling to a light pseudoscalar Higgs boson. The analysis studies the decays Υ(3S)→Υ(1S)π+π -, Υ(1S)→l+l-, where l=μ, τ. The result, Rτμ(Υ(1S))=1.005±0.013(stat)±0.022(syst), shows no deviation from the expected SM value, while improving the precision with respect to previous measurements.
Articolo in rivista - Articolo scientifico
Scientifica
BaBar detector; Higgs boson; The standard model; Bosons
English
Carpinelli Massimo (BABAR Collaboration)
Sanchez, P., Lees, J., Poireau, V., Prencipe, E., Tisserand, V., Tico, J., et al. (2010). Test of Lepton universality in ΓΥ(1S) decays at BABAR. PHYSICAL REVIEW LETTERS, 104(19) [10.1103/PhysRevLett.104.191801].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/389311
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