Determination of J/{psi} leptonic branching fraction via {psi}(2S){r_arrow}{pi}{sup +}{pi}{sup {minus}}J/{psi}
- Institute of High Energy Physics, Beijing 100039, Peoples Republic of (China)
- California Institute of Technology, Pasadena, California 91125 (United States)
- Colorado State University, Fort Collins, Colorado 80523 (United States)
A comparison of the rates for {psi}(2S){r_arrow}{pi}{sup +}{pi}{sup {minus}}J/{psi}, J/{psi}{r_arrow}l{sup +}l{sup {minus}} and J/{psi}{r_arrow} anything is used to determine the J/{psi} leptonic branching fractions. The results are B(J/{psi}{r_arrow}e{sup +}e{sup {minus}})=(5.90{plus_minus}0.05{plus_minus}0.10){percent} and B(J/{psi}{r_arrow}{mu}{sup +}{mu}{sup {minus}})=(5.84{plus_minus}0.06{plus_minus}0.10){percent}, where the first error is statistical and the second is systematic. Assuming lepton universality, the leptonic branching fraction of the J/{psi} is B(J/{psi}{r_arrow}l{sup +}l{sup {minus}})=(5.87{plus_minus}0.04{plus_minus}0.09){percent} per species. This result is used to estimate the QCD scale factor {Lambda}{sub {ovr MS}}{sup (4)} and the strong coupling constant {alpha}{sub s}. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 298614
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 9 Vol. 58; ISSN 0556-2821; ISSN PRVDAQ
- Country of Publication:
- United States
- Language:
- English
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