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

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doi:10.1103/PhysRevLett.93.081802

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].