Search for a new bottomonium state decaying to Υ(1S)π+π− in pp collisions at √s = 8 TeV

Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Erö, J. and Fabjan, C. and Friedl, M. and Frühwirth, R. and Ghete, V. M. and Hörmann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knünz, V. and Krammer, M. and Krätschmer, I. and Liko, D. and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and Schöfbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, W. and Waltenberger, W. and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Molnár, József and Pálinkás, József and Karancsi, János and Trócsányi, Zoltán and Ujvári, Balázs and Krajczár, Krisztián and Veres, Gábor (2013) Search for a new bottomonium state decaying to Υ(1S)π+π− in pp collisions at √s = 8 TeV. PHYSICS LETTERS B, 727 (1-3). pp. 57-76. ISSN 0370-2693

Preview

Text 1309.0250v2.pdf Available under License Creative Commons Attribution. Download (478kB) | Preview

Abstract

The results of a search for the bottomonium counterpart, denoted as Xb, of the exotic charmonium state X(3872) is presented. The analysis is based on a sample of pp col- lisions at √s = 8 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 20.7 fb−1. The search looks for the exclusive decay chan- nel Xb → Υ(1S)π+π− followed by Υ(1S) → μ+μ−. No evidence for an Xb signal is observed. Upper limits are set at the 95% confidence level on the ratio of the inclusive production cross sections times the branching fractions to Υ(1S)π+π− of the Xb and the Υ(2S). The upper limits on the ratio are in the range 0.9–5.4% for Xb masses be- tween 10 and 11 GeV. These are the first upper limits on the production of a possible Xb at a hadron collider.

Actions (login required)

Edit Item