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Author :
Publisher :
ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (16 download)
Download or read book Search for B \to K(*)nunubar and Invisible Quarkonium Decays written by and published by . This book was released on 2013 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (871 download)
Download or read book Search for B0 Decays to Invisible Final States and to Nu Nubar Gamma written by and published by . This book was released on 2004 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We establish upper limits on branching fractions for B° decays to final states where the decay products are purely invisible (i.e., no observable final state particles) and for B° decays to [nu]{bar [nu]}[gamma]. Within the Standard Model, these decays have branching fractions that are below current experimental sensitivity, but various models of physics beyond the Standard Model predict significant contributions from these channels. Using 88.5 million B{bar B} pairs collected at the [Upsilon](4S) resonance by the BABAR experiment at the PEP-II ee− storage ring at the Stanford Linear Accelerator Center, we establish upper limits at the 90% confidence level of 22 x 10−5 for the branching fraction of B° 2!invisible and 4.7 x 10−5 for the branching fraction of B° 2!{nu}{bar {nu}}[gamma].
Author : J. Adam M. Cunha
Publisher : ProQuest
ISBN 13 : 9780542855948
Total Pages : 384 pages
Book Rating : 4.8/5 (559 download)
Download or read book Search for Rare Quark-annihilation Decays, B± Mesons Decaying to D(s)*± Mesons and Phi Mesons written by J. Adam M. Cunha and published by ProQuest. This book was released on 2006 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a search for the decay B+/- & rarr; D*+/- sf using 212.2 fb-1 of data collected with the BABAR detector at the PEP-II B Factory at the Stanford Linear Accelerator Center between 1999 and 2004. This sample of 234 x 106 e+e- & rarr; Upsilon(4 S) & rarr; BB ̄ events yields no significant signal. We report the Bayesian upper limits B (B+/- & rarr; D+/-sf) x B (D+/-s & rarr; & phis;pi+/- )
