Search for a new bottomonium state decaying to Υ ( 1 S ) π + π - in pp collisions at s = 8 TeV
The results of a search for the bottomonium counterpart, denoted as $$X_b$$, of the exotic charmonium state X(3872) is presented. The analysis is based on a sample of pp collisions at $$\sqrt{s}$$ = 8 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 20.7 inverse femtobarns. The search looks for the exclusive decay channel $$X_b \to \Upsilon(1S) \pi^+ \pi^-$$ followed by $$\Upsilon(1S) \to \mu^+ \mu^-$$. No evidence for an $$X_b$$ 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 $$\Upsilon(1S) \pi^+ \pi^-$$ of the $$X_b$$ and the $$\Upsilon$$(2S). The upper limits on the ratio are in the range 0.9-5.4% for $$X_b$$ masses between 10 and 11 GeV. These are the first upper limits on the production of a possible $$X_b$$ at a hadron collider.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- CMS Collaboration
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1336619
- Report Number(s):
- FERMILAB-PUB-13-637-CMS; CMS-BPH-11-016; CERN-PH-EP-2013-157; arXiv:1309.0250; 1252068
- Journal Information:
- Physics Letters. Section B, Vol. 727, Issue 1-3; ISSN 0370-2693
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
Similar Records
New determination of the
Measurement of the