Observation of a New χb State in Radiative Transitions to Υ(1S) and Υ(2S) at ATLAS
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American Physical Society
G. Aad et al. (ATLAS Collaboration). (2012). Observation of a New Xb State in Radiative Transitions to Y (1S) and Y (2S) at ATLAS. Physical review letters, 108(15) 152001. [https://doi.org/10.1103/PhysRevLett.108.152001]
SponsorshipANPCyT; YerPhI, Armenia; Australian Research Council; BMWF, Austria; Azerbaijan National Academy of Sciences (ANAS); SSTC, Belarus; National Council for Scientific and Technological Development (CNPq); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); Natural Sciences and Engineering Research Council of Canada; National Research Centre (NRC); Canada Foundation for Innovation; CERN; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); Chinese Academy of Sciences; MOST; National Natural Science Foundation of China; Departamento Administrativo de Ciencia, Tecnologia e Innovacion Colciencias; Ministry of Education, Youth & Sports - Czech Republic; MPO CR; VSC CR; Czech Republic Government; DNRF; Danish Natural Science Research Council; Lundbeckfonden; European Union (EU); Centre National de la Recherche Scientifique (CNRS); CEA-DSM/IRFU, France; GNAS, Georgia; Federal Ministry of Education & Research (BMBF); German Research Foundation (DFG); HGF; Max Planck Society; Alexander von Humboldt Foundation; Greek Ministry of Development-GSRT; Israel Science Foundation; MINERVA; German-Israeli Foundation for Scientific Research and Development; DIP; Benoziyo Center, Israel; Istituto Nazionale di Fisica Nucleare (INFN); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science; CNRST, Morocco; FOM (The Netherlands); Netherlands Organization for Scientific Research (NWO) Netherlands Government; RCN, Norway; Ministry of Science and Higher Education, Poland; GRICES; Portuguese Foundation for Science and Technology; MERYS (MECTS), Romania; MES of Russia; Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia; MVZT, Slovenia; DST/NRF, South Africa; Spanish Government; SRC; Wallenberg Foundation, Sweden; SER; Swiss National Science Foundation (SNSF); Cantons of Bern; Geneva, Switzerland; National Science Council of Taiwan; Ministry of Energy & Natural Resources - Turkey; Royal Society of London; Leverhulme Trust; United States Department of Energy (DOE); National Science Foundation (NSF); Science & Technology Facilities Council (STFC) ST/J004928/1 ST/K001361/1 MINOS/MINOS+ ST/K001337/1 ST/J002798/1 ST/L001004/1 ST/K003658/1 ST/K001248/1 ATLAS ST/J005576/1 ST/H001069/2 ST/I006080/1 ST/K001264/1 ATLAS PP/E000347/1 ST/K001361/1 LHCb Upgrades ST/K001361/1 ATLAS ST/K00073X/1 ST/I000186/1 PP/E003087/1 ST/H001026/1 ST/H001093/1 ST/I003142/1 ST/K001361/1 LHCb ST/K001361/1 ATLAS Upgrades PP/E003699/1 ST/I005803/1 GRIDPP ST/L001144/1 ST/M001431/1 GRIDPP ST/K001361/1 ST/J004944/1 ST/G502320/1 ST/F007337/1 ST/I003525/1 PP/E003699/2 ST/H001026/2 ST/H001093/2 ST/J004928/1 ATLAS Upgrade ST/L000970/1 ST/K001329/1 ATLAS ST/L000970/1 ATLAS Upgrade ST/K001337/1 ATLAS ST/I003517/1 ST/I005803/1 ST/K003658/1 GRIDPP ATLAS ST/K001248/1; ICREA
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.