Download or read book Study of the Rare Decay B Xs L L at BaBar written by Ventzislav B. Koptchev and published by . This book was released on 2004 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of the Rare Decay of B0 0 0 at BABAR written by Daniel Anthony Bowerman and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of the Rare Decay of B pi pi at BaBar written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Search for the Rare Decay B u2192 l l in the BaBar Experiment written by and published by . This book was released on 2006 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rare decay B → ?ll- is the simplest manifestation of a b → dl+l- flavor-changing neutral current (FCNC) process. This type of process only proceeds through penguin loop or box diagrams and is sensitive to physics at the electroweak scale. It can be used to constrain parameters of the Standard Model and its extensions. B → ?l+l- events have not yet been observed; the branching fraction is expected to be an order of magnitude smaller than the measured branching fraction for the similar B → Kl+l- decay. Using 230 million B$ar{B}$ meson pairs collected with the BABAR detector, we have done a search for the rare decay B →?l+l- . The data was produced in e+e- collision at the Y(4S) resonance in the PEP-II collider between 1999 and 2004. Four exclusive B-meson decay modes have been reconstructed: B+ → ?+l+l- and B0 → ?0l+l- , where l+ l- is either an electron pair (e+e-) or a muon pair (?+?-). We find no evidence for a signal, and we obtain upper limits on the branching fractions ?. Assuming the isospin relation ?(B+ → ?+l+l- ) 2 x ?B+/?B0 ?(B0 → ?0l+l-), we obtain an upper limit at 90% confidence level on the lepton-flavor-averaged branching fraction of B → ?l+l- to be ?(B → ?e?) 9.2 x 10sup-8 /supat 90% C.L. We have also reconstructed two control modes Bsup+/sup→ ?sup+/supesup±/sup?sup±/sup and Bsup0/sup → ?sup0/supesup±/sup?sup±/sup and we also obtain an upper limit at 90% confidence level on the lepton-flavor-violating decay B → ?e? of ?(B → ?e?) 9.2 x 10

Download or read book Study of the Rare Decay B0 to Pi0 Pi0 at BaBar written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The BABAR experiment operating at the PEP-II ee− collider is designed to study CP violation effects in the B-meson system. From May 1999 to June 2002 approximately 81 fb−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° 2![pi]°[pi]° has been extracted using a multi-dimensional maximum likelihood technique. With an efficiency of 20.4%, we find 3614−1{sup +15+1} B° 2![pi]°[pi]° events and measure the branching fraction to be [Beta](B° 2![pi]°[pi]°) = (2.0{sub -0.8-0.2}{sup +0.9+0.3}) x 10−6 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° 2![pi]°[pi]°)

Download or read book Study of Hadronic and Rare B Decays in BABAR written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present results from BaBar experiment for the measurement of inclusive and exclusive branching fractions of B mesons into final states containing J/[psi], [psi](2S) and[chi]c. The contributions of CP even and odd amplitudes in the decay B[sup 0][yields] J/[psi]K*[sup 0] are determined from an angular analysis. We report the measurements of the branching ratios B[sup 0][yields] D*[sup+] D*[sup -] and D*[sup+] D*[sup -] K[sub S][sup 0], and the study of exclusive two-body and quasi-two-body charmless decays. The branching fraction of the decay B[sup 0][yields] K*[sup 0][gamma] has been determined and the corresponding CP asymmetry has been measured.

Download or read book Search for the Rare Decay B0 J psi in the BABAR Experiment written by Sheila McLachlin and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurements of Rare B Decays at BABAR written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the results of searches for rare B meson decays. The measurements use all or part of a data sample of about 88 million[Upsilon](4S)[yields] B[bar B] decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric energy B Factory at the Stanford Linear Accelerator Center. We study a variety of decays dominated by electromagnetic, electroweak and gluonic penguin transitions, and report measurements of branching fractions.

Download or read book Observation of the Three body Rare Decay B J psi Phi K written by and published by . This book was released on 2010 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report the study of the B meson decays B{sup ±} 2!J/[psi][phi]K{sup ±}, B° 2!J/[psi][phi]K° using 433 million of B{bar B} events collected at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II ee− asymmetric-energy collider. They obtain the branching fraction measurements: [Beta](B{sup ±} 2!J[psi][phi]K{sup ±}) = (5.6 {+-} 0.9(stat) {+-} 0.3(sys)) x 10−5, [Beta](B{sup {+-}} 2!J[psi][phi]K°) = (5.4 {+-} 1.2(stat) {+-} 0.4(sys)) x 10−5.

Download or read book Search for the Rare Decay B to Pi L l in the BaBar Experiment written by and published by . This book was released on 2007 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of the Rare Decays B0 Ds pi and B0 Ds K written by and published by . This book was released on 2002 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report on the evidence for the decays B° → D{sub s}?− and B° → D{sub s}− K+ and the results of a search for the decays B° → D*{sub s}+?− and B° → D*{sub s}− K+ from a sample of 84 million?(4S) decays into B meson pairs collected with the BaBar detector at the PEP II asymmetric-energy e+e− collider. The measured B° → D{sub s}+?− yield has a probability of less than 10−3 to be a fluctuation of the background and they measure the branching fraction?(B° → D{sub s}+?−) = (3.2 ± 0.9(stat.) ± 1.0 (syst.)) x 10−5. The measured B° → D{sub s}− K+ yield has a probability of less than 5 x 10−4 to be a fluctuation of the background and they measure the branching fraction?(B° → D{sub s}− K+) = (3.2 ± 1.0(stat.) ± 1.0(syst.)) x 10−5. They also set 90% C.L. limits?(B° → D*{sub s}+?−)

Download or read book Rare B Decays at BaBar written by and published by . This book was released on 2004 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report recent results in the search for the rare B meson decays B 2!?? and B° 2!?°?°. These results are based on 56.4 fb−1 collected by the BaBar Collaboration at the SLAC PEP-II ee− B Factory. We set new 90% confidence level upper limits?(B° 2!?°?)

Download or read book Study of Rare Radiative B Decay to K2 1430 Meson Using the BaBar Detector written by Qinghua Guo and published by . This book was released on 2004 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of B Decays to Open Charm Final States With the BaBar Experiment written by and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent results from the BaBar Collaboration in the sector of B decays to open Charm are presented. Some of the results represent new precision measurements and QCD tests, some other analysis is aimed to the study of rare decays and search for new physics. Branching fractions for the modes observed for the first time are highlighted. A few results are presented also in the baryon sector.

Download or read book A Study of the Rare Decays B D sub S and B D sub S K written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report evidence for the decays B° → D{sub s}?− and B° → D{sub s}− K+ and the results of a search for B° → D{sub s}+?− and B° → D{sub s}− K+ in a sample of 84 million?(4S) decays into B{bar B} pairs collected with the BABAR detector at the PEP II asymmetric-energy e+e− storage ring. The authors measure the branching fractions?(B° → D{sub s}+?−) = (3.2 ± 0.9(stat.) ± 1.0(syst.)) x 10−5 and?(B° → D{sub s}− K+) = (3.2 ± 1.0(stat.) ± 1.0(syst.)) x 10−5. They also set 90% C.L. limits?(B° → D{sub s}{sup *+}?−)

Download or read book Study of the B Xs gamma Decay with a Fully Inclusive Technique at the BABAR Detector written by Francesca Bucci and published by . This book was released on 2005 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rare Hadronic B Decays at BaBar written by D. Payne and published by . This book was released on 2003 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of rare decay results from BaBar are presented, from a data sample of 82 fb{sup -1} of data taken at the {Upsilon}(4S) resonance (corresponding to 88 x 10{sup 6} B{bar B} pairs).