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Author: Publisher: ISBN: Category : Languages : en Pages : 15
Book Description
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.
Author: Publisher: ISBN: Category : Languages : en Pages : 15
Book Description
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.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
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.
Author: John Jaros Publisher: World Scientific ISBN: 9789810241896 Category : Science Languages : en Pages : 952
Book Description
Stanford University hosted the XIX International Symposium on Lepton and Photon Interactions at High Energies on August 9 - 14, 1999, at the Law School on the Stanford University Campus, the site of the previous Symposia. This volume constitutes the proceedings of the Symposium.
Author: Publisher: ISBN: Category : Languages : en Pages : 145
Book Description
This work presents a search for three rare/forbidden neutral charm decays, D° → [mu]e, D° → [mu][mu], and D° → ee. This study was based on data collected in Experiment E789 at the Fermi National Accelerator Laboratory using 800 GeV/c proton-gold interactions. Two statistical analyses are presented, one with background subtraction and the other without background subtraction. No evidence is found for any of the decays and the following upper limits are presented at the 90% confidence level.
Author: John Jaros Publisher: World Scientific ISBN: 9814493775 Category : Science Languages : en Pages : 941
Book Description
Stanford University hosted the XIX International Symposium on Lepton and Photon Interactions at High Energies on August 9 - 14, 1999, at the Law School on the Stanford University Campus, the site of the previous Symposia. This volume constitutes the proceedings of the Symposium.
Author: Publisher: ISBN: Category : Languages : en Pages : 105
Book Description
I report the results of a search for flavor-changing neutral current, leptonflavor, and lepton-number violating decays of the 3 and 4-body decay modes of the D0 (and its antiparticle) containing muons and electrons. Using data from Fermilab charm hadroproduction experiment E791, I examine modes with two leptons and either a ?0, $\bar{K}$0, or ? vector meson or a non-resonant ?? , K? , or KK pair of pseudoscalar mesons. No evidence for any of these decays is found. Therefore, branching-fraction upper limits, typically at the 10-4 level, are presented at the 90% confidence level for the 27 decay modes examined. Of these searches, 18 are investigations of decays without previous published results; several others have significantly improved sensitivity over previous results.
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Author: ARGUS Collaboration
Author: John Jaros
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