rpp2010-rev-psi-chi-branching-ratios

rpp2010-rev-psi-chi-branching-ratios - 1 BRANCHING RATIOS...

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–1– BRANCHING RATIOS OF ψ (2 S )AND χ c 0 , 1 , 2 Updated May 2010 by J.J. Hern´andez-Rey (IFIC, Valencia), S. Navas (University of Granada), and C. Patrignani (INFN, Genova). Since 2002, the treatment of the branching ratios of the ψ (2 S )and χ c 0 , 1 , 2 has undergone an important restructuring. When measuring a branching ratio experimentally, it is not always possible to normalize the number of events observed in the corresponding decay mode to the total number of particles produced. Therefore, the experimenters sometimes report the number of observed decays with respect to another decay mode of the same or another particle in the relevant decay chain. This is actually equivalent to measuring combinations of branching fractions of several decay modes. To extract the branching ratio of a given decay mode, the collaborations use some previously reported measurements of the required branching ratios. However, the values are fre- quently taken from the Review of Particle Physics (RPP), which in turn uses the branching ratio reported by the experiment
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This note was uploaded on 06/07/2011 for the course PHYS 4132 taught by Professor Kutter during the Spring '11 term at University of Florida.

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rpp2010-rev-psi-chi-branching-ratios - 1 BRANCHING RATIOS...

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