Recent Results on Two-Photon and Tau Physics at BABAR. PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
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 fb1 are [Lambda]{sub tot}{sup {eta}{sub c}} = (33.3 ± 2.5(stat.) ± 0.8(sys.))MeV/c2 and M{sub {eta}{sub c}} = (2983.3 ± 1.2 ± 1.8) MeV/c2. An enhancement observed around 3.63 GeV/c2 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−1 is described. The measured [tau] lifetime is: [tau]{sub {tau}} = (290.8 ± 1.5(stat.) ± 1.6(syst.)) fs.
Author: Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
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 fb1 are [Lambda]{sub tot}{sup {eta}{sub c}} = (33.3 ± 2.5(stat.) ± 0.8(sys.))MeV/c2 and M{sub {eta}{sub c}} = (2983.3 ± 1.2 ± 1.8) MeV/c2. An enhancement observed around 3.63 GeV/c2 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−1 is described. The measured [tau] lifetime is: [tau]{sub {tau}} = (290.8 ± 1.5(stat.) ± 1.6(syst.)) fs.
Author: Publisher: ISBN: Category : Languages : en Pages : 6
Book Description
The authors present measurements of the [gamma][gamma]* → [pi]° transition form factor for the momentum transfer range Q2 = 4-40 GeV2 and the [gamma][gamma]* → [eta]{sub c} transition form factor for the range Q2 = 2-50 GeV2. The results of the measurement of the [eta]{sub c} mass, total and two-photon widths are also presented.
Author: Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
The BaBar collaboration has accumulated over 400 million [tau]-pairs which can be used to study charged leptonic and hadronic weak currents to unprecedented precision. This note presents results on lepton universality, measurements of.
Author: Alexander I Studenikin Publisher: World Scientific ISBN: 9814480940 Category : Science Languages : en Pages : 439
Book Description
This volume brings together the latest developments within a wide spectrum of topics in particle physics. Covering both theoretical and experimental aspects, areas such as neutrino and astroparticle physics, tests of the Standard Model and beyond, heavy quark physics, non-perturbative QCD, quantum gravity effects and cosmology, physics at the future accelerators, etc. are discussed.
Author: F. F. Wilson Publisher: ISBN: Category : Languages : en Pages : 5
Book Description
Recent results from {tau} physics studies at BABAR are presented with an emphasis on hadronic decays and lepton flavor violation studies.
Author: E. Torrence Publisher: ISBN: Category : Languages : en Pages :
Book Description
Recent results on tau physics from BABAR are reviewed. Limits on lepton-flavor violation in the tau decay process {tau}{sup -} {yields} {ell}{sup -}{ell}{sup +}{ell}{sup -} are presented based on 91.6 fb{sup -1} of data. In all six decay modes considered, the numbers of events found in data are compatible with the background expectations, and upper limits on the branching fractions are set in the range (1-3) x 10{sup -7} at 90% CL. A preliminary measurement of the .ve prong branching fraction based on 110.7 fb{sup -1} of data is presented with the result {Beta}({tau}{sup -} {yields} 3h{sup -}2h{sup +}{nu}{sub {tau}}) = (8.52 {+-} 0.09 {+-} 0.40) x 10{sup -4} . A preliminary measurement of the tau lifetime based on 30 fb{sup -1} of data is presented where a lifetime of 290.8 {+-} 1.5 {+-} 1.6 fs is measured.
Author: Publisher: ISBN: Category : Languages : en Pages : 21
Book Description
Recent results on charm and tau physics obtained at the BABAR and Belle experiments are presented in this article. The charm section will be focused on the most recent results on D°{bar D}° mixing at Belle and on the measurement of the pseudoscalar decay constant f{sub Ds} using charm tagged e+e- events at BABAR. In the tau section the recent results on Lepton Flavor Violation from tau decays will be discussed, as well as the recent result on the rare decay?− → 3?−2?2?°?{sub?} at BABAR and the measurement of the {tau} lepton mass at Belle.
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Author: Alexander I Studenikin
Author: F. F. Wilson
Author: E. Torrence
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Author: Jacob Grunhaus