Faithin Omaha eBook Collection

Download or read book Observation of Y(3940) to J/psi Omega in B to J/psi Omega K at BABAR. written by and published by . This book was released on 2007 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report the results of a study of the decays B 2!J/[psi][omega]K and B° 2!J/[psi][omega]K{sub S}° using 383 million B{bar B} events from [Upsilon](4S) decays with the BABAR detector at the PEP-II asymmetric-energy e+e− storage rings. They observe evidence for Y(3940) 2!J/[psi][omega] with product branching fractions [Beta](B+ 2!Y K+, Y 2!J/[psi][omega]) = (4.9 ± 1.0(stat) ± 0.5(syst)) x 10−5 and [Beta](B° 2!Y K°, Y 2!J/[psi][omega]) = (1.5{sub -1.2}{sup +1.4}(stat){sub -0.2}{sup +0.2}(syst)) x 10−5. The measured mass and width are M(Y) = (3914.6{sub -3.4}{sup +3.8}(stat){sub -1.9}{sup +1.9}(syst)) MeV/c2 and [Lambda](Y) = (33−{sup +12}(stat)−5{sup +5}(syst)) MeV, respectively.