Measurement of the ratio of branching fractions B(B±-->J/ psi pi ±)/B(B±-->J/ psi K±)

• Main Authors: Paus, Christoph M. E. (Contributor), Miles, Christopher J. (Contributor), Makhoul, K. (Contributor), Leonardo, N. (Contributor), Kravchenko, I. (Contributor), Knuteson, Bruce O. (Contributor), Iyutin, Boris (Contributor), Henderson, C. (Contributor), Hahn, Kristian Allan (Contributor), Choudalakis, Georgios (Contributor), Bolshov, Arkadiy (Contributor), Belloni, Alberto (Contributor), Bauer, Gerry P. (Contributor), Klute, Markus (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2010-03-03T16:48:25Z.
• Subjects: Article
• Online Access: Get fulltext

We report a measurement of the ratio of branching fractions of the decays B[superscript ±]→J/ψπ[superscript ±] and B[superscript ±]→J/ψK[superscript ±] using the CDF II detector at the Fermilab Tevatron Collider. The signal from the Cabbibo-suppressed B[superscript ±]→J/ψπ[superscript ±] decay is separated from B[superscript ±]→J/ψK[superscript ±] using the B[superscript ±]→J/ψK[superscript ±] invariant mass distribution and the kinematical differences of the hadron track in the two decay modes. From a sample of 220  pb[superscript -1] of pp̅ collisions at √s=1.96  TeV, we observe 91±15 B[superscript ±]→J/ψπ[superscript ±] events together with 1883±34 B[superscript ±]→J/ψK[superscript ±] events. The ratio of branching fractions is found to be B(B[superscript ±]→J/ψπ[superscript ±])/B(B[superscript ±]→J/ψK[superscript ±])=(4.86±0.82(stat)±0.15(syst))%.
Academy of Finland
European Community's Human Potential Programme
Comisión Interministerial de Ciencia y Tecnología, Spain
Russian Foundation for Basic Research
Royal Society, United Kingdom
Particle Physics and Astronomy Research Council, United Kingdom
Korean Research Foundation
Korean Science and Engineering Foundation
Bundesministerium für Bildung und Forschung, Germany
Alfred P. Sloan Foundation
Swiss National Science Foundation
National Science Council of the Republic of China
Natural Sciences and Engineering Research Council of Canada
Ministry of Education, Culture, Sports, Science and Technology of Japan
Italian Istituto Nazionale di Fisica Nucleare
National Science Foundation
United States Department of Energy