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Page : 5 pages
File Size : 17,60 MB
Release : 1999
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Based on a sample of approximately 500,000 hadronic Z° decays accumulated between 1993 and 1998, the SLD experiment has set limits on 24 fully charged two-body and quasi two-body exclusive charmless hadronic decays of B, B°, and B{sub s}° mesons. The precise tracking capabilities of the SLD detector provided for the efficient reduction of combinatoric backgrounds, yielding the most precise available limits for ten of these modes.
Author : Per Lasse Reinertsen
Publisher :
Page : 510 pages
File Size : 14,71 MB
Release : 1999
Category : Hadrons
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Page : pages
File Size : 20,11 MB
Release : 1999
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Rare decays of beauty particles were studied in several two-body exclusive hadronic charmless modes using the 19.4 pb-1 Z-pole data collected with the SLD detector at SLAC from 1993 to 1998. These decays are mediated by both tree level b 2!u and one-loop penguin b 2!s, d transitions. Upper limits for the branching ratios are set for the investigated modes Bs, B0 2!P+P-, B+ 2!V P+ and Bs, B0 2!V V, where the pseudoscalar particle P+ is either?+ or K+ and the vector particle V is either?0, K* 0 or?. Using an event selection algorithm consisting of a set of hard cuts combined with a set of discriminator functions, the efficiencies range between 24% and 37% with near zero background.
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Page : 5 pages
File Size : 12,7 MB
Release : 2000
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We present preliminary results of several searches for rare charmless hadronic decays of the B meson using data collected by the BABAR detector at the Stanford Linear Accelerator Center's PEP-II storage ring. We search for the decays hh−, h+h−h+, h+h−?°, X°h+, and X°K{sub S}°, where h =? or K, and X° =?' or?. In a sample of 8.8 million B{bar B} decays they measure the branching fractions. They calculate upper limits for the modes without a significant signal.
Author : K Huitu
Publisher : CRC Press
Page : 1112 pages
File Size : 18,71 MB
Release : 2000-01-01
Category : Science
ISBN : 9780750306614
High Energy Physics 99 contains the 18 invited plenary presentations and 250 contributions to parallel sessions presented at the International Europhysics Conference on High Energy Physics. The book provides a comprehensive survey of the latest developments in high energy physics. Topics discussed include hard high energy, structure functions, soft interactions, heavy flavor, the standard model, hadron spectroscopy, neutrino masses, particle astrophysics, field theory, and detector development.
Author : Gennadiy Anatolyevich Kukartsev
Publisher :
Page : 212 pages
File Size : 47,13 MB
Release : 2007
Category :
ISBN : 9780549168973
This document presents results of the search for B + → etaXK+ in which etaX → etapi+pi - or etaX → K0S K+pi-, and etaX is a potentially exotic state with a resonant mass within (1.2-1.8) GeV. We use the BABAR data of 382.9 million BB pairs and report the first observation of B+ → eta(1295) K+ and B+ → eta(1475)K+, and set upper limits for the modes listed below. We also consider an alternative signal model in the etaX → K0S K+/-pi∓ mode with an extra resonance, to better describe the meson mass spectrum. We provide the central values where possible. Hermitian conjugation is implied throughout the document unless stated otherwise. BB+/- →h1295 K+/- xBh 1295→h pp=2.93+0.77+0.22 -0.73-0.21 ˙10-6, BB+/- →h1475 K+/- xBh 1475→ KK&d1;p =13.79+1.83+1.00-1.65-0.56 ˙10-6. The following upper limits assume 90% C.L: BB+/- →f11285 K+/-xB f11285 →hpp
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Page : 175 pages
File Size : 22,41 MB
Release : 2004
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This thesis describes the analyses of the rare charmless hadronic B meson decays B° 2!?K° and B° 2!K*?−, using 20.58 fb−1 of e+e− data taken at the?(4S) resonance. The data were taken with the BABAR detector during its first run at the PEP-II asymmetric e+e− collider. Measurements of these modes using a counting technique are presented with the branching fractions?(B° 2!?K°) = (9.3 ± 3.4(stat.) ± 1.1(syst.)) x 10−6 with a significance of 4.9?, and?(B° 2!K*+?−) = (20.8 ± 9.3(stat.) ± 2.1(syst.)) x 10−6 with a significance of 3.0?. For the latter, an upper limit of?(B° 2!K*+?−)
Author : Alexandre Valerievich Telnov
Publisher :
Page : 446 pages
File Size : 40,91 MB
Release : 2003
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Author : Ali Anjomshoaa
Publisher :
Page : pages
File Size : 18,74 MB
Release : 2002
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Page : 115 pages
File Size : 24,96 MB
Release : 1941
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