Evidence for a narrow near-threshold structure in the J/ψ mass spectrum in B+→J/ψ K+ decays

Authors

T. Aaltonen, Harvard University
J. Adelman, Carnegie Mellon University
T. Akimoto, Rockefeller University
B. Álvarez González, University of California, Santa Barbara
S. Amerio, University of Oxford
D. Amidei, Institute of Particle Physics
A. Anastassov, The University of New Mexico
A. Annovi, University of Florida
J. Antos, Duke University
G. Apollinari, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Apresyan, Sapienza Università di Roma
T. Arisawa, Univerzita Komenského v Bratislave
A. Artikov, Duke University
W. Ashmanskas, Universitat Autònoma de Barcelona
A. Attal, Academia Sinica, Institute Of Physics
A. Aurisano, Osaka City University
F. Azfar, Duke University
W. Badgett, Kyungpook National University
A. Barbaro-Galtieri, Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
V. E. Barnes, National and Kapodistrian University of Athens
B. A. Barnett, Laboratoire de Physique Nucléaire et de Hautes Energies
P. Barria, University of Liverpool
V. Bartsch, Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas
G. Bauer, Massachusetts Institute of Technology
P. H. Beauchemin, Baylor University
F. Bedeschi, Brandeis University
D. Beecher, University of Illinois Urbana-Champaign
S. Behari, Laboratoire de Physique Nucléaire et de Hautes Energies

Document Type

Article

Publication Date

6-15-2009

Abstract

Evidence is reported for a narrow structure near the J/ψ threshold in exclusive B+→J/ψ K+ decays produced in p̄p collisions at s=1.96TeV. A signal of 14±5 events, with statistical significance in excess of 3.8 standard deviations, is observed in a data sample corresponding to an integrated luminosity of 2.7fb-1, collected by the CDF II detector. The mass and natural width of the structure are measured to be 4143.0±2.9(stat) ±1.2(syst)MeV/c2 and 11.7-5.0+8.3(stat)±3.7(syst)MeV/c2. © 2009 The American Physical Society.

Publication Source (Journal or Book title)

Physical Review Letters

Recommended Citation

Aaltonen, T., Adelman, J., Akimoto, T., Álvarez González, B., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., Antos, J., Apollinari, G., Apresyan, A., Arisawa, T., Artikov, A., Ashmanskas, W., Attal, A., Aurisano, A., Azfar, F., Badgett, W., Barbaro-Galtieri, A., Barnes, V., Barnett, B., Barria, P., Bartsch, V., Bauer, G., Beauchemin, P., Bedeschi, F., Beecher, D., & Behari, S. (2009). Evidence for a narrow near-threshold structure in the J/ψ mass spectrum in B+→J/ψ K+ decays. Physical Review Letters, 102 (24) https://doi.org/10.1103/PhysRevLett.102.242002