We present branching fraction measurements of the decays B+→a+1(1260)K0 and B0→a−1(1260)K+ with a±1(1260)→π∓π±π±. The data sample corresponds to 383×106 BB¯¯¯ pairs produced in e+e− annihilation through the Υ(4S) resonance. We measure the products of the branching fractions B(B+→a+1(1260)K0)B(a+1(1260)→π−π+π+)=(17.4±2.5±2.2)×10−6 and B(B0→a−1(1260)K+)B(a−1(1260)→π+π−π−)=(8.2±1.5±1.2)×10−6. We also measure the charge asymmetries Ach(B+→a+1(1260)K0)=0.12±0.11±0.02 and Ach(B0→a−1(1260)K+)=−0.16±0.12±0.01. The first uncertainty quoted is statistical and the second is systematic.
Observation ofB+→a1+(1260)K0andB0→a1−(1260)K+
SIMI, GABRIELE;A. Gaz;MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;
2008
Abstract
We present branching fraction measurements of the decays B+→a+1(1260)K0 and B0→a−1(1260)K+ with a±1(1260)→π∓π±π±. The data sample corresponds to 383×106 BB¯¯¯ pairs produced in e+e− annihilation through the Υ(4S) resonance. We measure the products of the branching fractions B(B+→a+1(1260)K0)B(a+1(1260)→π−π+π+)=(17.4±2.5±2.2)×10−6 and B(B0→a−1(1260)K+)B(a−1(1260)→π+π−π−)=(8.2±1.5±1.2)×10−6. We also measure the charge asymmetries Ach(B+→a+1(1260)K0)=0.12±0.11±0.02 and Ach(B0→a−1(1260)K+)=−0.16±0.12±0.01. The first uncertainty quoted is statistical and the second is systematic.File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.