The measurement of branching fraction for flavor-changing neutral-current process B→XSl+l-, was described. The final state was reconstructed from e+e- or μ+μ- pairs and hadronic system XS, which consists of one K∓ or KS0 and two pions. The systematic uncertainties in signal yield were also evaluated by varying signal gaussian parameters and signal shape. The results show that ratio between generator yield for decay modes which contain KS0 and modes containing a charged kaon was varied within range 0.50∓0.05, allows isospin violation.

Aubert, B., Barate, R., Boutigny, D., Couderc, F., Gaillard, J., Hicheur, A., et al. (2004). Measurement of the B → XSℓ+ℓ branching fraction with a sum over exclusive modes. PHYSICAL REVIEW LETTERS, 93(8), 1-7 [10.1103/PhysRevLett.93.081802].

Measurement of the B → XSℓ+ℓ branching fraction with a sum over exclusive modes

CARPINELLI, Massimo;
2004

Abstract

The measurement of branching fraction for flavor-changing neutral-current process B→XSl+l-, was described. The final state was reconstructed from e+e- or μ+μ- pairs and hadronic system XS, which consists of one K∓ or KS0 and two pions. The systematic uncertainties in signal yield were also evaluated by varying signal gaussian parameters and signal shape. The results show that ratio between generator yield for decay modes which contain KS0 and modes containing a charged kaon was varied within range 0.50∓0.05, allows isospin violation.
Articolo in rivista - Articolo scientifico
Calorimeters; Cerenkov counters; Charged particles; Combinatorial mathematics; Computer simulation; Fermi level; Mathematical models; Maximum likelihood estimation; Probability; Probability density function; Radiation detectors; Storage rings; Topology; Beam energy; Branching fraction; Decay products; Fermi motion model; Standard models (SM); High energy physics;
English
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7
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B. Aubert et al. (BABAR Collaboration)
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Gaillard, J., Hicheur, A., et al. (2004). Measurement of the B → XSℓ+ℓ branching fraction with a sum over exclusive modes. PHYSICAL REVIEW LETTERS, 93(8), 1-7 [10.1103/PhysRevLett.93.081802].
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