We present a study of the inclusive D*± production in the decay of Υ(1S) using (98.6±0.9)×106 Υ(2S) mesons collected with the BABAR detector at the Υ(2S) resonance. Using the decay chain Υ(2S)→π+π-Υ(1S), Υ(1S)→D*±X, where X is unobserved, we measure the branching fraction B[Υ(1S)→D*±X]=(2. 52±0.13(stat)±0.15(syst))% and the D*± momentum distribution in the rest frame of the Υ(1S). We find evidence for an excess of D*± production over the expected rate from the virtual photon annihilation process Υ(1S)→γ *→cc̄→D*±X.

Aubert, B., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., Prudent, X., et al. (2010). Observation of inclusive D*± production in the decay of Υ(1S). PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 81(1) [10.1103/PhysRevD.81.011102].

Observation of inclusive D*± production in the decay of Υ(1S)

CARPINELLI, Massimo
Membro del Collaboration Group
;
2010

Abstract

We present a study of the inclusive D*± production in the decay of Υ(1S) using (98.6±0.9)×106 Υ(2S) mesons collected with the BABAR detector at the Υ(2S) resonance. Using the decay chain Υ(2S)→π+π-Υ(1S), Υ(1S)→D*±X, where X is unobserved, we measure the branching fraction B[Υ(1S)→D*±X]=(2. 52±0.13(stat)±0.15(syst))% and the D*± momentum distribution in the rest frame of the Υ(1S). We find evidence for an excess of D*± production over the expected rate from the virtual photon annihilation process Υ(1S)→γ *→cc̄→D*±X.
Articolo in rivista - Articolo scientifico
BABAR detector
English
2010
81
1
011102
none
Aubert, B., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., Prudent, X., et al. (2010). Observation of inclusive D*± production in the decay of Υ(1S). PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 81(1) [10.1103/PhysRevD.81.011102].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389328
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