Search for the Decays B(s)-->e+mu- and B(s)-->e+e- in CDF Run II

• Main Authors: Xie, Si (Contributor), Makhoul, K. (Contributor), Knuteson, Bruce O. (Contributor), Henderson, C. (Contributor), Hahn, Kristian Allan (Contributor), Goncharov, M. (Contributor), Gomez-Ceballos, Guillelmo (Contributor), Choudalakis, Georgios (Contributor), Bauer, Gerry P. (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, 2010-02-21T16:13:23Z.
• Subjects: Article
• Online Access: Get fulltext

We report results from a search for the lepton flavor violating decays B[subscript s][superscript 0]→e[superscript +]μ[superscript -] and B[superscript 0]→e[superscript +]μ[superscript -], and the flavor-changing neutral-current decays B[subscript s][superscript 0]→e[superscript +]e[superscript -] and B[superscript 0]→e[superscript +]e[superscript -]. The analysis uses data corresponding to 2  fb[superscript -1] of integrated luminosity of pp̅ collisions at √s=1.96  TeV collected with the upgraded Collider Detector (CDF II) at the Fermilab Tevatron. The observed number of B[superscript 0] and B[subscript s][superscript 0] candidates is consistent with background expectations. The resulting Bayesian upper limits on the branching ratios at 90% credibility level are B(B[subscript s][superscript 0]→e[superscript +]μ[superscript -])<2.0×10[superscript -7], B(B[superscript 0]→e[superscript +]μ[superscript -])<6.4×10[superscript -8], B(B[subscript s][superscript 0]→e[superscript +]e[superscript -])<2.8×10[superscript -7], and B(B[superscript 0]→e[superscript +]e[superscript -])<8.3×10[superscript -8]. From the limits on B(B([subscript s])[superscript 0]→e[superscript +]μ[superscript -]), the following lower bounds on the Pati-Salam leptoquark masses are also derived: MLQ(B[subscript s][superscript 0]→e[superscript +]μ[superscript -])>47.8  TeV/c[superscript 2], and MLQ(B[superscript 0]→e[superscript +]μ[superscript -])>59.3  TeV/c[superscript 2], at 90% credibility level.
Academy of Finland
Slovak R&D Agency
Ministerio de Ciencia e Innovación and Programa Consolider-Ingenio 2010, Spain
Russian Foundation for Basic Research
Institut National de Physique Nucleaire et Physique des Particules/CNRS
Science and Technology Facilities Council and the Royal Society, U.K.
Korean Science and Engineering Foundation and the Korean Research Foundation
Bundesministerium für Bildung und Forschung, Germany
A. 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
U.S. Department of Energy and National Science Foundation