First Observation of B[over-bar][subscript s][superscript 0]-->D[subscript s][superscript ±]K[superscript ∓] and Measurement of the Ratio of Branching Fractions B(B[over-bar][subscript s][superscript 0]-->D[subscript s][superscript ±]K[superscript ∓]/B([over-bar][subscript s][superscript 0]-->D[subscript s][superscript +] pi[superscript -])

• Main Authors: Bauer, Gerry P. (Contributor), Choudalakis, Georgios (Contributor), Gomez-Ceballos, Guillelmo (Contributor), Hahn, Kristian Allan (Contributor), Henderson, C. (Contributor), Knuteson, Bruce O. (Contributor), Makhoul, K. (Contributor), Xie, Si (Contributor), Paus, Christoph M. E. (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, 2010-05-20T20:02:06Z.
• Subjects: Article
• Online Access: Get fulltext

A combined mass and particle identification fit is used to make the first observation of the decay B[over-bar] s0-->Ds±K∓ and measure the branching fraction of B[over-bar] s0-->Ds±K∓ relative to B[over-bar] s0-->Ds+pi-. This analysis uses 1.2  fb-1 integrated luminosity of pp[over-bar] collisions at [sqrt]s=1.96  TeV collected with the CDF II detector at the Fermilab Tevatron collider. We observe a B[over-bar] s0-->Ds±K∓ signal with a statistical significance of 8.1σ and measure B(B[over-bar] s0-->Ds±K∓)/B(B[over-bar] s0-->Ds+pi-)=0.097±0.018(stat)±0.009(syst).
Academy of Finland
Slovak R&D Agency
MEC (Spain)
Russian Foundation for Basic Research
Institut National de Physique Nucleaire et Physique des Particules/CNRS
Science and Technology Facilities Council, United Kingdom
Korea Science and Engineering Foundation
Korean Research 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
Istituto Nazionale di Fisica Nucleare of Italy
National Science Foundation
United States Department of Energy