We study B0→ρ0ρ0 decays in a sample of 465×106 Υ(4S)→BB̄ events collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction B=(0.92±0.32±0. 14)×10-6 and longitudinal polarization fraction fL=0.75-0.14+0. 11±0.05, where the first uncertainty is statistical and the second is systematic. The evidence for the B0→ρ0ρ0 signal has a significance of 3.1 standard deviations, including systematic uncertainties. We investigate the proper-time dependence of the longitudinal component in the decay and measure the CP-violating coefficients SL00=(0.3±0.7±0.2) and CL00=(0.2±0.8±0.3). We study the implication of these results for the unitarity triangle angle α.

Aubert, B., Bona, M., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., et al. (2008). Measurement of the branching fraction, polarization, and CP asymmetries in B0→ρ0ρ0 decay, and implications for the CKM angle α. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 78(7) [10.1103/PhysRevD.78.071104].

Measurement of the branching fraction, polarization, and CP asymmetries in B0→ρ0ρ0 decay, and implications for the CKM angle α

CARPINELLI, Massimo;
2008

Abstract

We study B0→ρ0ρ0 decays in a sample of 465×106 Υ(4S)→BB̄ events collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction B=(0.92±0.32±0. 14)×10-6 and longitudinal polarization fraction fL=0.75-0.14+0. 11±0.05, where the first uncertainty is statistical and the second is systematic. The evidence for the B0→ρ0ρ0 signal has a significance of 3.1 standard deviations, including systematic uncertainties. We investigate the proper-time dependence of the longitudinal component in the decay and measure the CP-violating coefficients SL00=(0.3±0.7±0.2) and CL00=(0.2±0.8±0.3). We study the implication of these results for the unitarity triangle angle α.
Articolo in rivista - Articolo scientifico
BABAR detector
English
B. Aubert et al. (BABAR Collaboration)
Aubert, B., Bona, M., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., et al. (2008). Measurement of the branching fraction, polarization, and CP asymmetries in B0→ρ0ρ0 decay, and implications for the CKM angle α. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 78(7) [10.1103/PhysRevD.78.071104].
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Ratcliff, B; Roodman, A; Salnikov, A; Schindler, R; Schwiening, J; Snyder, A; Su, D; Sullivan, M; Suzuki, K; Swain, S; Thompson, J; Va'Vra, J; Wagner, A; Weaver, M; West, C; Wisniewski, W; Wittgen, M; Wright, D; Wulsin, H; Yarritu, A; Yi, K; Young, C; Ziegler, V; Burchat, P; Edwards, A; Majewski, S; Miyashita, T; Petersen, B; Wilden, L; Ahmed, S; Alam, M; Ernst, J; Pan, B; Saeed, M; Zain, S; Spanier, S; Wogsland, B; Eckmann, R; Ritchie, J; Ruland, A; Schilling, C; Schwitters, R; Drummond, B; Izen, J; Lou, X; Bianchi, F; Gamba, D; Pelliccioni, M; Bomben, M; Bosisio, L; Cartaro, C; Ricca, G; Lanceri, L; Vitale, L; Azzolini, V; Lopez March, N; Martinez Vidal, F; Milanes, D; Oyanguren, A; Albert, J; Banerjee, S; Bhuyan, B; Choi, H; Hamano, K; Kowalewski, R; Lewczuk, M; Nugent, I; Roney, J; Sobie, R; Gershon, T; Harrison, P; Ilic, J; Latham, T; Mohanty, G; Band, H; Chen, X; Dasu, S; Flood, K; Pan, Y; Pierini, M; Prepost, R; Vuosalo, C; Wu, S
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389614
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