First Observation of Excited Ω b − States

• Published in: Physical review letters 2020-02, Vol.124 (8), p.1, Article 082002
• Main Authors: Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C. A., Aiola, S., Ajaltouni, Z., Akar, S., Albicocco, P., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Archilli, F., Arnau Romeu, J., Artamonov, A., Artuso, M., Arzymatov, K., Aslanides, E., Atzeni, M., Audurier, B., Bachmann, S., Back, J. J., Baker, S., Balagura, V., Baldini, W., Baranov, A., Barlow, R. J., Barsuk, S., Barter, W., Bartolini, M., Baryshnikov, F., Bassi, G., Batozskaya, V., Batsukh, B., Battig, A., Bay, A., Becker, M., Bedeschi, F., Bediaga, I., Beiter, A., Bel, L. J., Belavin, V., Belin, S., Bellee, V., Belous, K., Belyaev, I., Bencivenni, G., Ben-Haim, E., Benson, S., Beranek, S., Berezhnoy, A., Bernet, R., Berninghoff, D., Bernstein, H. C., Bertella, C., Bertholet, E., Bertolin, A., Betancourt, C., Betti, F., Bettler, M. O., Bezshyiko, Ia, Bhasin, S., Bhom, J., Bieker, M. S., Bifani, S., Billoir, P., Bizzeti, A., Bjørn, M., Blago, M. P., Blake, T., Blanc, F., Blusk, S., Bobulska, D., Bocci, V., Boente Garcia, O., Boettcher, T., Boldyrev, A., Bondar, A., Bondar, N., Borghi, S., Borisyak, M., Borsato, M., Borsuk, J. T., Bowcock, T. J. V., Bozzi, C., Bradley, M. J., Braun, S., Brea Rodriguez, A.
• Format: Article
• Language: English
• Subjects: Confidence; High Energy Physics - Experiment; High Energy Physics - Phenomenology; Large Hadron Collider; Luminosity; Physics
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.124.082002

We report four narrow peaks in the Ξb0K− mass spectrum obtained using pp collisions at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9  fb−1 recorded by the LHCb experiment. Referring to these states by their mass, the mass values are m[Ωb(6316)−]=6315.64±0.31±0.07±0.50  MeV, m[Ωb(6330)−]=6330.30±0.28±0.07±0.50  MeV, m[Ωb(6340)−]=6339.71±0.26±0.05±0.50  MeV, m[Ωb(6350)−]=6349.88±0.35±0.05±0.50  MeV, where the uncertainties are statistical, systematic, and the last is due to the knowledge of the Ξb0 mass. The natural widths of the three lower mass states are consistent with zero, and the 90% confidence-level upper limits are determined to be Γ[Ωb(6316)−]