We present the first measurement of Upsilon(4S) decays to pi(+)pi(-)Upsilon(1S) and pi(+)pi(-)Upsilon(2S) based on a sample of 230x10(6)Upsilon(4S) mesons collected with the BABAR detector. We measure the product branching fractions B(Upsilon(4S)->pi(+)pi(-)Upsilon(1S))xB(Upsilon(1S)->mu(+)mu(-))=(2.23 +/- 0.25(stat)+/- 0.27(syst))x10(-6) and B(Upsilon(4S)->pi(+)pi(-)Upsilon(2S))xB(Upsilon(2S)->mu(+)mu(-))=(1.69 +/- 0.26(stat)+/- 0.20(syst))x10(-6), from which we derive the partial widths Gamma(Upsilon(4S)->pi(+)pi(-)Upsilon(1S))=(1.8 +/- 0.4) keV and Gamma(Upsilon(4S)->pi(+)pi(-)Upsilon(2S))=(2.7 +/- 0.8) keV.

Observation of Upsilon(4S) decays to pi(+)pi(-)Upsilon(1S) and pi(+)pi(-)Upsilon(2S) RID C-2728-2008 RID C-5223-2009 RID C-5719-2008 RID D-1055-2009 RID A-2675-2009

ANGELINI, CARLO;BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CALDERINI, GIOVANNI;FORTI, FRANCESCO;GIORGI, MARCELLO;RIZZO, GIULIANA;
2006-01-01

Abstract

We present the first measurement of Upsilon(4S) decays to pi(+)pi(-)Upsilon(1S) and pi(+)pi(-)Upsilon(2S) based on a sample of 230x10(6)Upsilon(4S) mesons collected with the BABAR detector. We measure the product branching fractions B(Upsilon(4S)->pi(+)pi(-)Upsilon(1S))xB(Upsilon(1S)->mu(+)mu(-))=(2.23 +/- 0.25(stat)+/- 0.27(syst))x10(-6) and B(Upsilon(4S)->pi(+)pi(-)Upsilon(2S))xB(Upsilon(2S)->mu(+)mu(-))=(1.69 +/- 0.26(stat)+/- 0.20(syst))x10(-6), from which we derive the partial widths Gamma(Upsilon(4S)->pi(+)pi(-)Upsilon(1S))=(1.8 +/- 0.4) keV and Gamma(Upsilon(4S)->pi(+)pi(-)Upsilon(2S))=(2.7 +/- 0.8) keV.
2006
Aubert, B; Barate, R; Bona, M; Boutigny, D; Couderc, F; Karyotakis, Y; Lees, Jp; Poireau, V; Tisserand, V; Zghiche, A; Grauges, E; Palano, A; Chen, Jc...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/182012
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