Measurement of the mass of the τ lepton

Jz, Bai; Bardon, O.; Ra, Becker-Szendy; Burnett, T. H.; Js, Campbell; Sj, Chen; Chen, Sm; Yq, Chen; Zd, Cheng; Ja, Coller; Rf, Cowan; Hc, Cui; Xz, Cui; Hl, Ding; Zz, Du; Dunwoodie, W.; Fang, C.; Mj, Fero; Ml, Gao; Sq, Gao; Wx, Gao; Yn, Gao; Jh, Gu; Sd, Gu; Gu, Weizhong; Yn, Guo; Yy, Guo; Han, Y. L.; Hatanaka, Makoto; He, Jun; Hitlin, D. G.; Gy, Hu; Hu, T.; Dq, Huang; Yz, Huang; Izen, J. M.; Qp, Jia; Ch, Jiang; Zj, Jiang; As, Johnson; La, Jones; Kelsey, M.; Yf, Lai; Pf, Lang; Lankford, A. J.; F, Li; Li, Jian; Li, PQ; Qm, Li; Rb, Li; Li, Wei; Wd, Li; Li, WG; Ys, Li; Sz, Lin; Liu, HM; Q, Liu; Liu, RG; Y, Liu; Lowery, B.; Lu, J. Y.; Dh, Ma; Ma, EC; Jm, Ma

doi:10.1103/physrevlett.69.3021

Cited by 88 publications

(27 citation statements)

References 3 publications

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“…Besides the values of the gauge couplings at Q = m Z , one also needs the Yukawa couplings of the third generation of quarks and leptons at m Z . The mass of the τ is now very precisely known, m τ = 1776.9 ± 0.5 MeV [60]. The mass of the b-quark, however, has a larger uncertainty.…”

Section: Running the Rgesmentioning

confidence: 99%

Study of constrained minimal supersymmetry

Kane

Kolda²,

Roszkowski³

et al. 1994

Phys. Rev. D

607

686

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Taking seriously the phenomenological indications for supersymmetry, we have made a detailed study of unified minimal SUSY, including many effects at the few percent level in a consistent fashion. We report here a general analysis of what can be studied without choosing a particular gauge group at the unification scale. Firstly, we find that the encouraging SUSY unification results of recent years do survive the challenge of a more complete and accurate analysis. Taking into account effects at the 5-10% level leads to several improvements of previous results, and allows us to sharpen our predictions for SUSY in the light of unification. We perform a thorough study of the parameter space and look for patterns to indicate SUSY predictions, so that they do not depend on arbitrary choices of some parameters or untested assumptions. Our results can be viewed as a fully constrained Minimal SUSY Standard Model (CMSSM).The resulting model forms a well-defined basis for comparing the physics potential of different facilities. Very little of the acceptable parameter space has been excluded by LEP or FNAL so far, but a significant fraction can be covered when these accelerators are upgraded. A number of initial applications to the understanding of the values of m h and m t , the SUSY spectrum, detectability of SUSY at LEP II or FNAL, BR(b → sγ), Γ(Z → bb), dark matter, etc., are included in a separate section that might be of more interest to some readers than the technical aspects of model-building. We formulate an approach to extracting SUSY parameters from data when superpartners are detected. For small tan β or large m t both m 1/2 and m 0 are entirely bounded from above at O(1 TeV) without having to use a fine-tuning constraint.

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Section: Running the Rgesmentioning

confidence: 99%

Study of constrained minimal supersymmetry

Kane

Kolda²,

Roszkowski³

et al. 1994

Phys. Rev. D

607

686

View full text Add to dashboard Cite

show abstract

“…When we neglect the tiny contribution from b → u transitions, the input parameters entering our calculations are the mass of the tau lepton [14], m τ = 1.777 GeV, (3.1) the heavy quark masses m b and m c , the hadronic parameters λ 1 and λ 2 , and the quark mixing parameter |V cb |. We stress, however, that not all of these parameters are independent.…”

Section: Input Parametersmentioning

confidence: 99%

Heavy quark expansion for the inclusive decay

et al. 1994

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Abstract:We calculate the differential decay rate for inclusiveB → τν X transitions to order 1/m 2 b in the heavy quark expansion, for both polarized and unpolarized tau leptons. We show that using a systematic 1/m b expansion significantly reduces the theoretical uncertainties in the calculation. We obtain for the total branching ratio BR(B → τν X) = 2.30±0.25%, and for the tau polarization A pol = −0.706 ± 0.006. From the experimental measurement of the branching ratio at LEP, we derive the upper bound λ 1 ≤ 0.8 GeV 2 for one of the parameters of the heavy quark effective theory.

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“…Recently, Peres, Pleitez and Zukanovich Funchal (PPZ) [7] carried out a comprehensive analysis of the existing data on the meson and lepton weak decays assuming that three generations of neutrinos are massive and mixed. Their analysis was based on the 1992 Particle Data Group (PDG) data [8] combined with the latest (in 1993) data on τ decays [9]. The results are quite surprising in that the 1992 data on the decay branching ratios would be consistent with a finite mass for ν 3 , i.e.…”

Section: Introductionmentioning

confidence: 99%

Limits on the neutrino mass and mixing angle from pion and lepton decays

et al. 1996

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Motivated by a recent rather surprising conclusion based on the 1992 PDG data on the pion, kaon and lepton decays that if three generations of neutrinos are assumed to be massive and mixed, the heaviest neutrino, ν 3 , could have a mass in the range, 155 MeV < ∼ m 3 < ∼ 225 MeV, we have analyzed the latest 1995 data on the leptonic decays of pion, µ and τ with the assumption that three generations of neutrinos are massive and mixed. It is shown that when the radiative corrections are included and the constraint from partial decay widths is imposed, the 1995 data are consistent with three massless neutrinos with no mixing. Various limits on the neutrino mass and mixing angle implied by the 1995 data are presented together with a critique of the previous analysis.14.60.Pq, 13.35.-r Typeset using REVT E X *

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Measurement of the mass of the τ lepton

Cited by 88 publications

References 3 publications

Study of constrained minimal supersymmetry

Study of constrained minimal supersymmetry

Heavy quark expansion for the inclusive decay

Limits on the neutrino mass and mixing angle from pion and lepton decays

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