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EnglishWe study B(0)->rho(0)rho(0) decays in a sample of 465x10(6) Upsilon(4S)-> B(B)overbar 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)x10(-6) and longitudinal polarization fraction f(L)=0.75(-0.14)(+0.11)+/- 0.05, where the first uncertainty is statistical and the second is systematic. The evidence for the B(0)->rho(0)rho(0) 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 S(L)(00)=(0.3 +/- 0.7 +/- 0.2) and C(L)(00)=(0.2 +/- 0.8 +/- 0.3). We study the implication of these results for the unitarity triangle angle alpha.
http://hdl.handle.net/11384/5186| Titolo: | Measurement of the branching fraction, polarization, and CP asymmetries in B(0)->rho(0)rho(0) decay, and implications for the CKM angle alpha RID C-5223-2009 |
| Autori interni: | LUSIANI, Alberto |
| Data di pubblicazione: | 2008 |
| Rivista: | PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY |
| Abstract: | We study B(0)->rho(0)rho(0) decays in a sample of 465x10(6) Upsilon(4S)-> B(B)overbar 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)x10(-6) and longitudinal polarization fraction f(L)=0.75(-0.14)(+0.11)+/- 0.05, where the first uncertainty is statistical and the second is systematic. The evidence for the B(0)->rho(0)rho(0) 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 S(L)(00)=(0.3 +/- 0.7 +/- 0.2) and C(L)(00)=(0.2 +/- 0.8 +/- 0.3). We study the implication of these results for the unitarity triangle angle alpha. |
| Handle: | http://hdl.handle.net/11384/5186 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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