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| Author | : Alexander Tumanov |
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| Total Pages | : 192 |
| Release | : 2002 |
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| Total Pages | : 5 |
| Release | : 2003 |
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This thesis presents various studies of K{sub s}° mesons carried out at the BABAR experiment. Studying multiplicities of K{sub s}° in B{bar B} decays provides deeper knowledge of the detector performance and produces an important physical result. The branching fraction of B{bar B} → K{sub s}°X decay is measured using 286 pb−1 of data collected during the first year of physics running. The result obtained is BR(B{bar B} → XK{sub s}° →??−) = 0.216 ± 0.003(stat.) ± 0.015(syst.). Implications of this result to the presence of the new physics at TeV scale are discussed. The momentum spectrum of K{sub s}° coming from B{bar B} → XK{sub s}° →?+?− is also presented.
| Author | : Marcella Bona |
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| Total Pages | : 210 |
| Release | : 2001 |
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| Author | : Karsten Köneke |
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| Total Pages | : 198 |
| Release | : 2003 |
| Genre | : B mesons |
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| Total Pages | : 172 |
| Release | : 2010 |
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The primary goals of the BABAR experiment are the detection of CP violation (CPV) in the B meson system, the precise measurement of some of the elements of the CKM matrix and the measurement of the rates of rare B meson decays. At present, BABAR has achieved major successes: (1) the discovery, in neutral B decays, of direct and mixing-induced CP violation; (2) accurate measurements of the magnitudes of the CKM matrix elements.
| Author | : Nicola Gagliardi |
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| Release | : 2009 |
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| Total Pages | : 129 |
| Release | : 2002 |
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This thesis presents an exclusive measurement of the branching fraction B for the rare charmless hadronic B decays to ?K final states. A sample of 22.57±0.36 million BB pairs was collected with the BaBar detector at the Stanford Linear Accelerator Center's PEP-II B Factory, during the Run 1 data taking period (1999-2000).
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| Total Pages | : 129 |
| Release | : 2002 |
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This thesis presents an exclusive measurement of the branching fraction B for the rare charmless hadronic B decays to [pi]K final states. A sample of 22.57±0.36 million BB pairs was collected with the BaBar detector at the Stanford Linear Accelerator Center's PEP-II B Factory, during the Run 1 data taking period (1999-2000).
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| Release | : 2003 |
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The BABAR experiment operating at the PEP-II e[sup+]e[sup -] collider is designed to study CP violation effects in the B-meson system. From May 1999 to June 2002 approximately 81 fb[sup -1] of data have been collected at the[Upsilon](4S) resonance, containing (87.9[+-] 1.4) Million BB pairs. From this data sample the branching fraction for the decay B[sup 0][yields][pi][sup 0][pi][sup 0] has been extracted using a multi-dimensional maximum likelihood technique. With an efficiency of 20.4%, we find 36[sub -14-1][sup+15+1] B[sup 0][yields][pi][sup 0][pi][sup 0] events and measure the branching fraction to be[Beta](B[sup 0][yields][pi][sup 0][pi][sup 0])= (2.0[sub -0.8-0.2][sup+0.9+0.3]) x 10[sup -6] where the first error is statistical and the second systematic. The statistical significance is 3.1[sigma] and we report an upper limit of[Beta](B[sup 0][yields][pi][sup 0][pi][sup 0])
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| Release | : 2002 |
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Using about 23M B[bar B] events collected in 1999-2000 with the BABAR detector, they report on the decays B[yields] D(*)[bar D](*)K and B[sup 0][yields] D*[sup+]D*[sup -]. The branching fractions of the low background decay modes B[sup 0][yields] D*[sup -] D(*)[sup 0]K[sup+] are determined to be[Beta](B[sup 0][yields] D*[sup -] D[sup 0]K[sup+])= (2.8[+-] 0.7[+-] 0.5) x 10[sup -3] and[Beta](B[sup 0][yields] D*[sup -]D*[sup 0]K[sup+])= (6.8[+-] 1.7[+-] 1.7) x 10[sup -3], where the first error quoted is statistical and the second systematic. Observation of a significant number of candidates in the color-suppressed decay mode B[sup+][yields] D*[sup+]D*[sup -] K[sup+] is reported with a branching fraction[Beta](B[sup+][yields] D*[sup+]D*[sup -] K[sup+])= (3.4[+-] 1.6[+-] 0.9) x 10[sup -3]. Decays of the type B[yields] D(*)[bar D](*) can be used to provide a measurement of the parameter sin2[beta] of the Unitarity Triangle. For this decay mode they measure a branching fraction of[Beta](B[sup 0][yields] D*[sup+]D*[sup -])= (8.0[+-] 1.6[+-] 1.2) x 10[sup -4].
