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

Abstract

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:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
CDF Collaboration
OSTI Identifier:
1022793
Alternate Identifier(s):
OSTI ID: 1101123
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
Resource 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)
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

Citation Formats

Aaltonen, T. Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0 → Λµ+µ-. United States: N. p., 2011. Web. doi:10.1103/PhysRevLett.107.201802.
Aaltonen, T. Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0 → Λµ+µ-. United States. https://doi.org/10.1103/PhysRevLett.107.201802
Aaltonen, T. Tue . "Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0 → Λµ+µ-". United States. https://doi.org/10.1103/PhysRevLett.107.201802. https://www.osti.gov/servlets/purl/1022793.
@article{osti_1022793,
title = {Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0 → Λµ+µ-},
author = {Aaltonen, T.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.107.201802},
journal = {Physical Review Letters},
number = 20,
volume = 107,
place = {United States},
year = {Tue Nov 08 00:00:00 EST 2011},
month = {Tue Nov 08 00:00:00 EST 2011}
}

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