Do Antimixing And Rare Charm Decays

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Do Antimixing And Rare Charm Decays

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Author :
language : en
Publisher:
Release Date : 2003

Do Antimixing And Rare Charm Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

We review the current status of flavor-changing neutral currents in the charm sector. We focus on the standard-model predictions and identify the main sources of theoretical uncertainties in both charm mixing and rare charm decays. The potential of these observables for constraining short-distance physics in the standard model and its extensions is compromised by the presence of large nonperturbative effects. We examine the possible discovery windows in which short-distance physics can be tested and study the effects of various extensions of the standard model. The current experimental situation and future prospects are reviewed.

Search For D0 D0bar Mixing And Rare Charm Decays

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Author :
language : en
Publisher:
Release Date : 2005

Search For D0 D0bar Mixing And Rare Charm Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

Search For D0 D0bar Mixing And Rare Charm Decays

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Author : U. Egede
language : en
Publisher:
Release Date : 2004

Search For D0 D0bar Mixing And Rare Charm Decays written by U. Egede and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

Based on a dataset acquired by the BABAR experiment running on and near the {Upsilon}(4S) resonance from 1999-2002, an upper limit is set on the rate of D{sup 0}-{bar D}{sup 0} mixing using the decay mode D*{sup +} {yields} D{sup 0}{pi}{sup +}, followed by a semi-leptonic decay of the D{sup 0}. Results are compared to previous BABAR analysis using hadronic decays. We also set limits on the flavor-changing neutral current decays D{sup 0} {yields} e{sup +}e{sup -} ({mu}{sup +}{mu}{sup -}) and the lepton-flavor violation decays D{sup 0} {yields} e{sup {+-}}{mu}{sup {-+}}.

Rare Radiative Charm Decays In And Beyond The Standard Model

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Author : Nico Adolph
language : en
Publisher:
Release Date : 2022

Rare Radiative Charm Decays In And Beyond The Standard Model written by Nico Adolph and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.

Rare Charm Decays In The Standard Model And Beyond

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Author :
language : en
Publisher:
Release Date : 2001

Rare Charm Decays In The Standard Model And Beyond written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

We perform a comprehensive study of a number of rare charm decays, incorporating the first evaluation of the QCD corrections to the short distance contributions, as well as examining the long range effects. For processes mediated by the c 2!ull− transitions, we show that sensitivity to short distance physics exists in kinematic regions away from the vector meson resonances that dominate the total rate. In particular, we find that D 2![pi]ll− and D 2![rho]l+l− are sensitive to non-universal soft-breaking effects in the Minimal Supersymmetric Standard Model with R-parity conservation. We separately study the sensitivity of these modes to R-parity violating effects and derive new bounds on R-parity violating couplings. We also obtain predictions for these decays within extensions of the Standard Model, including extensions of the Higgs, gauge and fermion sectors, as well as models of dynamical electroweak symmetry breaking.

Searches For Rare Or Forbidden Semileptonic Charm Decays

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Author :
language : en
Publisher:
Release Date : 2011

Searches For Rare Or Forbidden Semileptonic Charm Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

We present searches for rare or forbidden charm decays of the form X{sub c} 2!h{sup ±}l{sup {-+}}l{sup ({prime})+}, where X{sub c} is a charm hardron (D+, D{sub s}+, or [Lambda]{sub c}+), h{sup {+-}} is a pion, kaon, or proton, and l{sup ({prime}){+-}} is an electron or muon. The analysis is based on 384 fb−1 of e+e− annihilation data collected at or close to the [Upsilon](4S) resonance with the BABAR detector at the SLAC National Accelerator Laboratory. No significant signal is observed for any of the 35 decay modes that are investigated. We establish 90% confidence-level upper limits on the branching fractions between 1 x 10−6 and 44 x 10−6 depending on the channel. In most cases, these results represent either the first limits or significant improvements on existing limits for the decay modes studied.

Rare Charm And B Decays At Cdf

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Author : Julia Thom
language : en
Publisher:
Release Date : 2003

Rare Charm And B Decays At Cdf written by Julia Thom and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

We present results on rare charm and B decays using 65pb{sup -1} of data taken with the CDF detector in Run II. Three results are discussed, a measurement of the relative branching ratios {Lambda}(D{sup 0} {yields} K{sup +}K{sup -})/{Lambda}(D{sup 0} {yields} K{pi}) and {Lambda}(D{sup 0} {yields} {pi}{sup +}{pi}{sup -})/{Lambda}(D{sup 0} {yields} K{pi}) and the direct CP-violating decay rate asymmetry, and a limit on the branching ratio of the FCNC decay D{sup 0} {yields} {mu}{sup +}{mu}{sup -}. We also discuss the prospects for the search for B{sub s}{sup 0} {yields} {mu}{sup +}{mu}{sup -} decays.

Searching For Rare Charm Decays Performing Alignment Studies And Improving The Analysis Ecosystem In Hep

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Author : Christopher Burr
language : en
Publisher:
Release Date : 2019

Searching For Rare Charm Decays Performing Alignment Studies And Improving The Analysis Ecosystem In Hep written by Christopher Burr and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.

Rare Charm And B Decays At Cdf

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Author :
language : en
Publisher:
Release Date : 2004

Rare Charm And B Decays At Cdf written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

We present results on rare charm and B decays using 65pb[sup -1] of data taken with the CDF detector in Run II. Three results are discussed, a measurement of the relative branching ratios[Lambda](D[sup 0][yields] K[sup+]K[sup -])/[Lambda](D[sup 0][yields] K[pi]) and[Lambda](D[sup 0][yields][pi][sup+][pi][sup -])/[Lambda](D[sup 0][yields] K[pi]) and the direct CP-violating decay rate asymmetry, and a limit on the branching ratio of the FCNC decay D[sup 0][yields][mu][sup+][mu][sup -]. We also discuss the prospects for the search for B[sub s][sup 0][yields][mu][sup+][mu][sup -] decays.

Search For Rare And Forbidden Charm Meson Decays At Fermilab E791

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Author :
language : en
Publisher:
Release Date : 2000

Search For Rare And Forbidden Charm Meson Decays At Fermilab E791 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.

The authors report the results of a blind search for flavor-changing neutral current, lepton-flavor violating, and lepton-number violating decays of D, D{sub s}, and D° mesons (and their antiparticles) into modes containing muons and electrons. Using data from Fermilab charm hadroproduction experiment E791, they examine the [pi]ll and Kll decay modes of D+ and D{sub s}+ and the l+l− decay modes of D°. No evidence for any of these decays is found. Therefore, they present branching-fraction upper limits at 90% confidence level for the 24 decay modes examined. Eight of these modes have no previously reported limits, and fourteen are reported with significant improvements over previously published results.