Observation of a new χb state in radiative transitions to Y(1S) and Y(2S) at ATLAS

Georges Aad,Brad Abbott,J. Abdallah,A. A. Abdelalim,A. Abdesselam,Ovsat Abdinov,B. Abi, M. Abolins,Ossama AbouZeid,Halina Abramowicz,Henso Abreu,E. Acerbi, Bobby Samir Acharya,Leszek Adamczyk,David H. Adams, T. N. Addy,Jahred Adelman,M. Aderholz, Stefanie Adomeit, P. Adragna,Tim Adye, S. Aefsky,J. A. Aguilar-Saavedra, M. Aharrouche,S. P. Ahlen, F. Ahles,A. Ahmad, M. Ahsan,Giulio Aielli,T. Akdogan, T. P.A. Kesson, G. Akimoto,A. V. Akimov,A. Akiyama,M. S. Alam,M. A. Alam,J. Albert,S. Albrand,Martin Aleksa,Igor Aleksandrov, F. Alessandria,Calin Alexa,Gideon Alexander,G. Alexandre,Theodoros Alexopoulos,Muhammad Alhroob,Malik Aliev,Gianluca Alimonti, John Alison,M. Aliyev, Benedict Allbrooke,P. P. Allport,S. E. Allwood-Spiers,J. Almond,Alberto Aloisio, R. Alon,Alejandro Alonso,B. Alvarez Gonzalez,Mariagrazia Alviggi, K. Amako, P. Amaral,Christoph Amelung,V. V. Ammosov,António Amorim, Gabriel Amorós, N. Amram,Christos Anastopoulos, L. S. Ancu,Nansi Andari,Timothy Andeen,Christoph Falk Anders, G. Anders,K. J. Anderson,A. Andreazza, V. Andrei,M. L. Andrieux,X. S. Anduaga,Aaron Angerami,Francis Anghinolfi,Alexey Anisenkov,Nuno Anjos,Alberto Annovi, A. Antonaki,Massimo Antonelli, A. Antonov, J. Antos, F. Anulli, S. Aoun,L. Aperio Bella, R. Apolle,Giorgi Arabidze, I. Aracena,Yoshio Arai, A. T. H. Arce, Samir Arfaoui,J-F. Arguin, E. Arik,Metin Arik, Aaron James Armbruster, Olivier Arnaez

Physical Review Letters（2012）

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摘要

The χb(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider at √s=7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb-1, these states are reconstructed through their radiative decays to Υ(1S,2S) with Υ→μ+μ-. In addition to the mass peaks corresponding to the decay modes χb(1P,2P)→Υ(1S)γ, a new structure centered at a mass of 10.530±0.005(stat)±0.009(syst) GeV is also observed, in both the Υ(1S)γ and Υ(2S)γ decay modes. This structure is interpreted as the χb(3P) system.

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