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Search Results: 1 - 10 of 308625 matches for " William J. Marciano "
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Precision Electroweak Parameters and the Higgs Mass
William J. Marciano
Physics , 2000, DOI: 10.1063/1.1336239
Abstract: The status of various precisely measured electroweak parameters is reviewed. Natural relations among them are shown to constrain the Higgs mass, m_H, via quantum loop effects to relatively low values. A comparison with direct Higgs searches is made.
Extra Long Baseline Neutrino Oscillations and CP Violation
William J. Marciano
Physics , 2001,
Abstract: The potential for studying CP violation in neutrino oscillations using conventional neutrino and anti-neutrino beams is examined.
Precision Electroweak Measurements and ``New Physics''
William J. Marciano
Physics , 1999,
Abstract: The status of several precisely measured electroweak parameters is reviewed. Natural relations among them are shown to constrain the Higgs mass, m_H, as well as various ``New Physics'' effects. Indications of an anomalous Zb anti-b coupling are discussed. Constraints on excited W^* bosons are given.
Fermi Constants and ``New Physics''
William J. Marciano
Physics , 1999, DOI: 10.1103/PhysRevD.60.093006
Abstract: Various precision determinations of the Fermi constant are compared. Included are muon and (leptonic) tau decays as well as indirect prescriptions employing $\alpha, m_Z, m_W, \ssthwmzms, \Gamma(Z\to\ell^+\ell^-)$, and $\Gamma(Z \to \nu\bar \nu)$ as input. Their good agreement tests the standard model at the $\pm 0.1%$ level and provides stringent constraints on new physics. That utility is illustrated for: heavy neutrino mixing, 2 Higgs doublet models, S, T, and U parameters and excited $W^{\ast^\pm}$ bosons (Kaluza-Klein excitations). For the last of those examples, $m_{W^\ast}\gsims 2.9$ TeV is found.
KAON 99 - Summary and Perspective
William J. Marciano
Physics , 1999,
Abstract: An overview of KAON 99 with commentary is presented. Emphasis is placed on the state of CKM mixing and CP violation. The Jarlskog invariant, J_{CP}, is shown to provide a useful quantitative comparison of K and B phenomenology. The potential of future rare and ``forbidden'' decay experiments to probe O(3000 TeV) ``New Physics'' is also described.
Electroweak radiative corrections to b --> s gamma
Andrzej Czarnecki,William J. Marciano
Physics , 1998, DOI: 10.1103/PhysRevLett.81.277
Abstract: Two loop electroweak corrections to b --> s gamma decays are computed. Fermion and photonic loop effects are found to reduce R = BR(b --> s gamma)/BR(b --> c e nu) by 8+-2% and lead to the standard model prediction BR(B --> X_s gamma)=(3.28 +- 0.30)x10^-4 for inclusive B meson decays. Comparison of R^{theory} =(3.04 +- 0.25)x10^-3(1+0.10rho), where rho is a Wolfenstein CKM parameter, with the current experimental average R^{exp}=(2.52+-0.52)x10^-3 gives rho=-1.7+-1.9 which is consistent with -0.21
Lepton anomalous magnetic moments - a theory update
Andrzej Czarnecki,William J. Marciano
Physics , 1998, DOI: 10.1016/S0920-5632(99)00474-0
Abstract: Standard Model contributions to the electron, muon, and tau lepton anomalous magnetic moments, a_l=(g_l-2)/2, are reviewed and updated. The fine structure constant is obtained from the electron g_e-2 and used to refine the QED contribution to the muon g_mu-2. Recent advances in electroweak and hadronic effects on g_mu-2 are summarized. Examples of ``New Physics'' probed by the a_mu Brookhaven experiment E821 are outlined. The prediction for a_tau is also given.
Electroweak Radiative Corrections To Polarized M?ller Scattering Asymmetries
Andrzej Czarnecki,William J. Marciano
Physics , 1995, DOI: 10.1103/PhysRevD.53.1066
Abstract: One loop electroweak radiative corrections to left-right parity violating M{\o}ller scattering ($e^-e^-\to e^-e^-$) asymmetries are presented. They reduce the standard model (tree level) prediction by 40$\pm 3$ \% where the main shift and uncertainty stem from hadronic vacuum polarization loops. A similar reduction also occurs for the electron-electron atomic parity violating interaction. That effect can be attributed to an increase of $\sin^2\theta_W(q^2)$ by $3\%$ in running from $q^2=m_Z^2$ to 0. The sensitivity of the asymmetry to ``new physics'' is also discussed.
Polarized Moller Scattering Asymmetries
Andrzej Czarnecki,William J. Marciano
Physics , 2000, DOI: 10.1142/S0217751X00002433
Abstract: The utility of polarized electron beams for precision electroweak studies is described. Parity violating Moller scattering asymmetries in e-e- --> e-e- are discussed. Effects of electroweak radiative corrections and the running sin^2(theta_W(Q^2)) are reviewed. The sensitivity of E158 (a fixed target e-e- experiment at SLAC) and future e-e- collider studies to ``new physics'' is briefly outlined.
The Muon Anomalous Magnetic Moment: Standard Model Theory and Beyond
Andrzej Czarnecki,William J. Marciano
Physics , 2000,
Abstract: QED, Hadronic, and Electroweak Standard Model contributions to the muon anomalous magnetic moment, a_mu = (g_mu-2)/2, are reviewed. Theoretical uncertainties in the prediction a_mu^SM = 116591597(67) times 10^{-11} are scrutinized. Effects due to ``New Physics'' are described. Implications of the current experiment vs. theory constraint a_mu^exp - a_mu^SM = 453(465) times 10^{-11} and anticipated near term error reduction to +- 155 times 10^{-11} are discussed.
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