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Title: Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0 → Λµ+µ-

The authors report the first observation of the baryonic flavor-changing neutral current decay Λb0 → Λµ+µ- with 24 signal events and a statistical significance of 5.8 Gaussian standard deviations. This measurement uses a pp¯ collisions data sample corresponding to 6.8 fb-1 at √s = 1.96 TeV collected by the CDF II detector at the Tevatron collider. The total and differential branching ratios for Λb0 → Λµ+µ- are measured. They find Β(Λb0 → Λµ+µ-) = [1.73 ± 0.42(stat) ± 0.55(syst)] x 10-6. They also report the first measurement of the differential branching ratio of Bs0→φµ+µ- using 49 signal events. In addition, they report branching ratios for B+→K+µ+µ-, B0→K0µ+µ- and Β→ K*(892)µ+µ- decays.
Authors:
 [1]
  1. et al.
Publication Date:
OSTI Identifier:
1022793
Report Number(s):
FERMILAB-PUB-11-328-E
Journal ID: ISSN 0031-9007; arXiv eprint number arXiv:1107.3753; TRN: US1104152
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 20; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
CDF Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BRANCHING RATIO; DECAY; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; NEUTRAL CURRENTS Experiment-HEP