Observation of a New chi(b) State in Radiative Transitions to Y(1S) and Y(2S) at ATLAS
2012 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 108, no 15, 152001- p.Article in journal (Refereed) Published
The chi(b)(np) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider at root 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 Y(1S,2S) with Y ->mu(+)mu(-). In addition to the mass peaks corresponding to the decay modes chi(b)(1P,2P)-> Y(1S)gamma, a new structure centered at a mass of 10.530 +/- 0.005(stat)+/- 0.009(syst) GeV is also observed, in both the Y(1S)gamma and Y(2S)gamma decay modes. This structure is interpreted as the chi(b)(3P) system.
Place, publisher, year, edition, pages
2012. Vol. 108, no 15, 152001- p.
IdentifiersURN: urn:nbn:se:uu:diva-175049DOI: 10.1103/PhysRevLett.108.152001ISI: 000302635600005OAI: oai:DiVA.org:uu-175049DiVA: diva2:529932
With 3031 more authors from the ATLAS Collaboration.2012-05-312012-05-312012-05-31Bibliographically approved