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Search for the rare leptonic decay B+-->mu(+)nu(mu)
B Aubert1, R Barate, D Boutigny
1Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Physical Review Letters
|July 13, 2004
Summary
Researchers searched for the rare B+ to muon neutrino decay using BABAR experiment data. No significant signal was found, establishing an upper limit for this rare B+ meson decay.
Area of Science:
- Particle Physics
- High Energy Physics
- Experimental Physics
Background:
- Rare B+ meson decays offer insights into fundamental particle physics.
- Leptonic decays, such as B+ to muon neutrino, are particularly sensitive to new physics beyond the Standard Model.
- Previous searches have constrained the branching fractions of such rare decays.
Purpose of the Study:
- To search for the rare leptonic decay B+ --> mu(+)nu(mu).
- To set an upper limit on the branching fraction of this decay using experimental data.
- To probe for potential new physics contributions to B+ meson decays.
Main Methods:
- Utilized data collected by the BABAR experiment at the PEP-II storage ring.
- Analyzed a sample of 88.4 x 10^6 BBbar meson pairs collected at the Upsilon(4S) resonance.
- Employed analysis techniques to identify and reconstruct the B+ --> mu(+)nu(mu) decay signature.
Main Results:
- No significant evidence for the B+ --> mu(+)nu(mu) signal was observed.
- An upper limit on the branching fraction was established at B(B+ --> mu(+)nu(mu)) < 6.6 x 10^-6.
- The result is reported at the 90% confidence level.
Conclusions:
- The absence of a signal places stringent constraints on the branching fraction of this rare decay.
- The findings contribute to the ongoing effort to test the Standard Model of particle physics.
- This measurement helps to limit the parameter space for potential new theoretical models.