Recent Results on Hadronic D/sub S/ and D Meson Decays from the Mark III.
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Published: 1989
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Recent Results on D Meson Decays from the MARK III.
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Published: 1985
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DOWNLOAD EBOOKThe MARK III Collaboration recently completed the analysis of a number of decay modes of charged and neutral D mesons produced in electron-positron collisions near the peak of the psi(3770) resonance at SLAC's SPEAR storage ring. The mesons were produced nearly at rest in pairs, either DD− or D° anti D°, at a center-of-mass energy below the threshold for DD production. The unique kinematics of the production allow us to isolate the charmed meson signal clearly and unambiguously. The data were collected with the MARK III Spectrometer, a large solid angle magnetic detector. Our data sample corresponds to an integrated luminosity of approximately 9.3 inverse picobarns. New results will be presented on the absolute branching ratios of D mesons into hadronic final states, branching ratios for three body decays via pseudoscalar-vector intermediate states, and branching ratios for Cabibbo allowed and Cabibbo suppressed decays. Inclusive and exclusive branching ratios for the semi-leptonic decays of D mesons will be presented, as well as the first measurement of the vector form factor in the decay D° .-->. K−e, nu, evidence for interference in D+ decays, and new information on the contributions of W exchange diagrams to D° decays.
Hadronic Decays of the D/S Meson
Author: Steven R. Wasserbaech
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Published: 1989
Total Pages: 282
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DOWNLOAD EBOOKEnergy Research Abstracts
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Published: 1989
Total Pages: 690
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DOWNLOAD EBOOKResults on Charmed Meson Decays from Mark III.
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Published: 1987
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DOWNLOAD EBOOKWe report recent results on charmed meson decays, obtained using the Mark III detector at SPEAR. The first topic discussed is the observation of ee− .-->. D/sub s/D/sub s/* at .sqrt.s = 4.14 GeV. The D/sub s/* is detected as a peak in the mass distribution recoiling from D/sub s//sup + -/ .-->. phi.pi./sup + -/. The mass of the D/sub s/* is found to be (2109.3 +- 2.1 +- 3.1)MeV/c2, yielding a D/sub s/*-D/sub s/ mass difference of (137.9 +- 2.1 +- 4.3) MeV/c2. The production cross section times branching ratio is also measured. Next, a search for the decay D .-->. .mu.+nu/sub .mu./ is described. A preliminary upper limit (90% CL) on B(D+ .-->. .mu.+nu/sub .mu./) of 8.4 x 10−4 is obtained, corresponding to an upper limit on the decay constant f/sub D/ of 340 MeV/c2. Finally, we present results of a search for the lepton family number violating decay D° .-->. .mu.e. We find B(D° .-->. .mu.e)
D Meson Hadronic Decays at CLEO-c
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Published: 2011
Total Pages: 50
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DOWNLOAD EBOOKThe recent CLEO-c results on hadronic decays of D and D{sub s} mesons are presented. First the absolute branching fractions for D and D{sub s} mesons using a double tag technique are discussed, then are the Cabibbo suppressed decays and doubly Cabibbo suppressed decays. Finally, I present the inclusive and rare decay modes and other measurements from CLEO-c. These decays illuminate a wide range of physics. A brief theoretical introduction is given before the corresponding discussion on measurement.
Energy Research Abstracts
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Published: 1989
Total Pages: 874
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DOWNLOAD EBOOKHadronic Decays of the D[sub S] Meson and a Model-independent Determination of the Branching Fraction for the D[sub S] Decay of to Phi Pi
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Published: 2001
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DOWNLOAD EBOOKDuring the running periods of the years 1992, 1993, 1994 the BES experiment at the Beijing Electron Positron Collider (BEPC) collected 22.9[plus-minus] 0.7 pb[sup[minus]1] of data at an energy of 4.03 GeV, which corresponds to a local peak for e[sup+]e[sup[minus]][yields] D[sub s][sup+]D[sub s][sup[minus]] production. Four D[sub s] hadronic decay modes were tagged: D[sub s][yields][phi][pi];[phi][yields] K[sup+]K[sup[minus]]; D[sub s][yields][bar K]*(892)[sup o]K;[bar K]*[sup o](892)[yields] K[sup[minus]][pi][sup+]; D[sub s][bar K][sup o]K;[bar K][sub s][sup o][yields][pi][sup+][pi][sup[minus]]; D[sub s][yields][bar K]*(892)[sup o]K*;[bar K]*[sup o](892)[yields] K[sup[minus]][pi][sup+]; K*(892)[yields] K[sup o][pi][sup+]; K[sub s][sup o][yields][pi][sup+][pi][sup[minus]]. Using the method of double-tagging, BES performed the first model-independent measurement of BrD[sub s[yields][phi][pi]]. Our result was Br[sub D[sub s][yields][phi][pi]]= 3.4[sub[minus]1.7-0.7][sup+4.8+1.3].
Results on D and D/sub S/ Decays from Mark III.
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Published: 1989
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DOWNLOAD EBOOKThe decays D° → ?/sup −/e?/sub e/ and D° → K/sup −/e+?/sub e/ are observed in a sample of e+e/sup /minus// → ?(3770) events collected with the Mark III detector at SPEAR. The branching fractions B(D° → ?/sup /minus//e+?/sub e/) = (0.39/sub /minus/0.11//sup +0.23//plus minus/0.04)% and B(D° → K/sup /minus//e+?/sub e/) = (3.4/plus minus/0.5/plus minus/0.4)% are measured. The ratio of Kobayashi-Maskawa matrix elements V/sub cd//V/sub cs/ 2 = (0.057/sub /minus/0.015//sup +0.0.38//plus minus/0.005) is obtained under the assumption that the form factors f/sub +//sup K/(0) and f/sub +//sup ?/ are equal. A study of the absolute D/sub s//sup +/ hadronic branching fractions is made by searching for fully reconstructed e/sup +/e/sup /minus// /yields/ D/sub s//sup */plus minus//D/sub s//sup /minus plus// events at /radical/s = 4.14 GeV. The 90% confidence level limit B(D/sub s//sup +/ /yields/ /phi//pi//sup +/)
Hadronic Decays of the D/sub S/ Meson
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Published: 1989
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DOWNLOAD EBOOKThe D/sub s/ is the lowest-lying pseudoscalar meson containing charm and anti-strange quarks. Evidence for this state was first reported in 1977, although more recent observations disagree with some of the early results. Since 1983 the weakly decaying D/sub s/+ has been observed in many experiments. Relative branching fractions have been measured for many non-leptonic decay modes, including D/sub s/+ 2!??+,??+?+?/sup /minus//, /bar K/*°K+, and f0(975)?+. The absolute branching fractions are estimated in high energy e+e/sup /minus// annihilation from the observed numbers of reconstructed D/sub s/+ decays and the expected D/sub s/+ production cross section. The lowest-lying vector c/bar s/ meson, the D/sub s/*+, has also been seen in its decay to?D/sub s/+. Weak decays of the heavy quark and lepton flavors are relevant to the development of the Standard Model of both the electroweak and the strong interactions. Measurements of charmed particle weak decay are useful for determining the parameter of the Standard Model and for testing phenomenological models which include strong effects. 83 refs., 56 figs., 12 tabs.
