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Author: Publisher: ISBN: Category : Languages : en Pages : 6
Book Description
Results from analysis of data taken in 1987--88 are presented. These include branching ratios for decays of D° and D{sub s}, and decay fractions for the nonresonant channel and channels involving K{sup *+} and?° in the decay D° → K{sub s}°?+?−. An emphasis to look for the decay of P-wave D-mesons, D{sup **0} → D{sup *+}?−, is described.
Author: Publisher: ISBN: Category : Languages : en Pages : 6
Book Description
Results from analysis of data taken in 1987--88 are presented. These include branching ratios for decays of D° and D{sub s}, and decay fractions for the nonresonant channel and channels involving K{sup *+} and?° in the decay D° → K{sub s}°?+?−. An emphasis to look for the decay of P-wave D-mesons, D{sup **0} → D{sup *+}?−, is described.
Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
About 104 charm decays have been reconstructed from first-run data of Fermilab experiment E687 using the Fermilab Wide-Band Photon Spectrometer with the world's highest energy photon beam. The success of techniques for isolating and reconstructing charm event samples based on two complementary vertexing strategies is illustrated. Preliminary results are presented. These include lifetime value of (0.50 {plus minus} 0.06 {plus minus} 0.03)ps for the D{sub s}, and (0.20 {plus minus} 0.03 {plus minus} 0.03)ps for the?{sub c}+. Preliminary values for the D+ and D° lifetimes are consistent with currently accepted world averages. Signals for the Cabibbo-suppressed decays D° →?+?−?+?−, D+ → K+K−?+, and D+ →??+ are shown; for B(D° →?+?−?+?−)/B(D° → K−?+?+?−) our preliminary value is 0.10 {plus minus} 0.02 {plus minus} 0.02. Preliminary values for ratios B(D° → {ovr K}°K+K−)/B(D° → {ovr K}°?+?−) and B(D° → {ovr K}°?)/B(D° → {ovr K}°?+?−) are 0.20 {plus minus} 0.06 and 0.16 {plus minus} 0.06. Preliminary results are given for cross sections of D*{sup {plus minus}} and D{sup {plus minus}} photoproduction on a Be target for the p2{sub {tau}} dependence of D{sup {minus plus}} photoproduction and for the ratios D{double prime}/D*+ and D*−/D{sup {minus plus}}. The energy dependence of the total open charm photoproduction cross section is compared with model predictions for photon energies up to 350 GeV. 18 refs., 5 figs.
Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
About 104 charm decays have been reconstructed from first-run data of Fermilab experiment E687 using the Fermilab Wide-Band Photon Spectrometer with the world's highest energy photon beam. Charm selection strategies and preliminary results are discussed. Lifetime values are (.50 {plus minus} .06 {plus minus} .03)ps for the D{sub s} and (.20 {plus minus} .03 {plus minus} .03)ps for the?{sub c}+. Preliminary D+ and D° lifetimes are consistent with current world averages. Signals for charm baryon and Cabibbo-suppressed charm meson decays are shown. Preliminary branching ratios are: B(D° →?+?−?+?−)/B(D° → K−?+?+?−) = .10 {plus minus} .02 {plus minus} .02; B(D° → {bar K}°K+K−)/B(D° → {bar K}°?+?−) = .20 {plus minus} .06(stat); B(D° → {bar K}°?)/B(D° → {bar K}°?+?−) = .16 {plus minus} .06(stat). Preliminary results are given on D*{sup {plus minus}} and D{sup {plus minus},0} photoproduction for photon energies from 100 to 350 GeV. 13 refs., 3 figs.
Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
Recent analyses of charm spectroscopy from Fermilab fixed target experiment 687 are summarized. Emphasis is placed on the phenomenology of Cabibbo suppression in the meson sector. Such transitions have been observed in the semileptonic modes and hadronic modes. While the former transitions give us an opportunity to observe the weak current and the CKM matrix, a systematic comparison of the latter transitions allow us to study strong interaction effects, and possibly, light quark spectroscopy.
Author: Publisher: ISBN: Category : Languages : en Pages : 8
Book Description
Results from the Fermilab charm photoproduction experiment E687 are reviewed. The physics goals and the improvements being made for the next experiment (FOCUS/E831) are described. We expect to accumulate a million fully reconstructed charm decays which represent an order of magnitude improvement over E687.
Author: Publisher: ISBN: Category : Languages : en Pages : 16
Book Description
I present asymmetries between the production of charm particles and anti-particles from Fermilab experiments, E687, E769 and E791. The results are shown as a function of x{sub F} and p{sub t}2 for D{sup {+-}} and D{sub s}{sup {+-}} mesons and for pion, kaon and photon beams and compared against current models. Results are also shown for a recent analysis of correlations between production of charm mesons and an associated pion. 14 refs., 5 figs., 3 tabs.
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Author: J. Thanh Van Tran
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