Recent Results on Two-Photon and tau Physics at BABAR
We present a measurement of the total width {Lambda}{sub tot}{sup {eta}{sub c}} and mass M{sub {eta}{sub c}} of the {eta}{sub c} meson with the BABAR detector at the PEP-II B-factory at SLAC. The results based on a data sample of 88 fb{sub -1} are {Lambda}{sub tot}{sup {eta}{sub c}} = (33.3 {+-} 2.5(stat.) {+-} 0.8(sys.))MeV/c{sup 2} and M{sub {eta}{sub c}} = (2983.3 {+-} 1.2 {+-} 1.8) MeV/c{sup 2}. An enhancement observed around 3.63 GeV/c{sup 2} can be interpreted as an evidence for the {eta}{sub c}(2S) state. In addition a preliminary measurement of the {tau} lepton lifetime using 30.2 fb{sup -1} is described. The measured {tau} lifetime is: {tau}{sub {tau}} = (290.8 {+-} 1.5(stat.) {+-} 1.6(syst.)) fs.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 813251
- Report Number(s):
- SLAC-PUB-9979; TRN: US0303811
- Resource Relation:
- Other Information: PBD: 13 Jun 2003
- Country of Publication:
- United States
- Language:
- English
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