A Search for Flavor Changing Neutral Currents and Lepton Family Number Violation in Neutral Two-body Charm Decays

A Search for Flavor Changing Neutral Currents and Lepton Family Number Violation in Neutral Two-body Charm Decays PDF Author: David Aaron Pripstein
Publisher:
ISBN:
Category :
Languages : en
Pages : 292

Book Description

A Search for Flavor Changing Neutral Currents and Lepton Family Number Violation in Neutral Two-body Charm Decays

A Search for Flavor Changing Neutral Currents and Lepton Family Number Violation in Neutral Two-body Charm Decays PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
This work presents a search for three rare/forbidden neutral charm decays, D[sup 0][yields][mu]e, D[sup 0][yields][mu][mu], and D[sup 0][yields] 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.

New Physics With New Experiments - Proceedings Of Xvi Kazimierz Meeting On Elementary Particle Physics

New Physics With New Experiments - Proceedings Of Xvi Kazimierz Meeting On Elementary Particle Physics PDF Author: Zygmunt Ajduk
Publisher: World Scientific
ISBN: 9814551767
Category :
Languages : en
Pages : 502

Book Description
This volume gives an up-to-date, useful review of the recent results and new ideas concerning the following topics: precision tests of the standard model, search for Higgs bosons, CP violation, flavour physics, neutrino physics, testing extensions of the standard model, supersymmetry, particle physics, cosmology and new results in strong interactions.

A Search for Effective Flavour Changing Neutral Currents in K/sub L/° Decays

A Search for Effective Flavour Changing Neutral Currents in K/sub L/° Decays PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
A dedicated search for the decays K/sub L/° → [mu]e, K/sub L/° → ee and K/sub L/° → [mu][mu], was carried out at the Brookhaven National Laboratory AGS (E780). The data obtained were also used in a search for the three-body decays K/sub L/° → [pi]°l /sup /plus/1/sup -/. The two body modes were normalized to the kinelatically similar, CP violating, decay K/sub L/° → [pi]/sup (plus//[pi]/sup -/; whereas the three body modes were normalized to the decay K/sub L/° /yields/ [pi]°/pi//sup /plus//pi//sup /minus//. The search was performed on a sample of K° mesons produced in the forward direction by the interactions of 29 GeV protons on a copper target, and decaying in a 3 meter long region, starting augmented by a hydrogen Cerenkov counter and a lead glass electromagnetic calorimeter, for electron identification, and by a range stack, for muon identification. 9 refs., 5 figs., 2 tabs.

Search for Flavor Changing Neutral Current Decays of Charm Mesons

Search for Flavor Changing Neutral Current Decays of Charm Mesons PDF Author: Nicholas James Witchey
Publisher:
ISBN:
Category :
Languages : en
Pages : 326

Book Description

Dissertation Abstracts International

Dissertation Abstracts International PDF Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 700

Book Description

Limits on Flavor Changing Neutral Currents in D0 Meson Decays

Limits on Flavor Changing Neutral Currents in D0 Meson Decays PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
Using the CLEO II detector at CESR, we have searched for flavor changing neutral currents and lepton family number violations in D[sup 0] meson decays. The upper limits on the branching fractions for D[sup 0][yields][ell][sup+][ell][sup -] and D[sup 0][yields] X[sup 0][ell][sup+][ell][sup -] are in the range 10[sup -5] to 10[sup -4], where X[sup 0] can be a[pi][sup 0], K[sub s][sup 0], [eta], [rho][sup 0], [omega], [bar K]*[sup 0], or[phi] meson, and the[ell][sup+][ell][sup -] pair can be e[sup+]e[sup -], [mu][sup+][mu][sup -], or e[sup[+-]][mu][sup[-+]]. Although these limits are above the theoretical predictions, most are new or an order of magnitude lower than previous limits.

Search for Flavor-changing Neutral Current and Lepton-flavor Violating Decays of D[sup 0] --] [ell][sup +] [ell][sup -].

Search for Flavor-changing Neutral Current and Lepton-flavor Violating Decays of D[sup 0] --] [ell][sup +] [ell][sup -]. PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
The authors report on a search for the flavor-changing neutral current decays D[sup 0] --> e[sup +]e[sup -] and D[sup 0] --> [mu][sup +][mu][sup -], and the lepton-flavor violating decay D[sup 0] --> e[sup [+-]][mu][sup [-+]]. The measurement is based on 122 fb[sup -1] of data collected by the BABAR detector at the PEP-II asymmetric e[sup +]e[sup -] collider. No evidence is found for any of the decays. The upper limits on the branching fractions, at the 90% confidence level, are 1.2 x 10[sup -6] for D[sup 0] --> e[sup +]e[sup -], 1.3 x 10[sup -6] for D[sup 0] --> [mu][sup +][mu][sup -], and 8.1 x 10[sup -7] for D[sup 0] --> e[sup [+-]][mu][sup [-+]].

American Doctoral Dissertations

American Doctoral Dissertations PDF Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 806

Book Description

A Search for Flavour Changing Neutral Current Processes in Decays of Charmed Mesons

A Search for Flavour Changing Neutral Current Processes in Decays of Charmed Mesons PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
Neutral current interactions are known from studies of K meson decays to conserve flavor to a high precision. Although flavor changing neutral currents (FCNC) are forbidden in the Weinberg-Salam model, many extensions of the Standard Model allow such processes. We present preliminary upper limits on FCNC-mediated decays of charmed particles, namely D° .-->. ee−, D° .-->. .mu.mu.−, D° .-->. .mu.e and D+ .-->. .pi.+.mu.e.
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