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Upper Limits On Inclusive Branching Fractions To Narrow States In Radiative J Psi Decays
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Book Synopsis Upper Limits on Inclusive Branching Fractions to Narrow States in Radiative J/psi Decays by : Gregory P. Dubois
Download or read book Upper Limits on Inclusive Branching Fractions to Narrow States in Radiative J/psi Decays written by Gregory P. Dubois and published by . This book was released on 1992 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radiative Decays of PSI(3684). [Branching Fraction, Upper Limits]. by :
Download or read book Radiative Decays of PSI(3684). [Branching Fraction, Upper Limits]. written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of studies of radiative decays of psi(3684) are presented. The data for this work were obtained with the Magnetic Detector at the electron-positron storage ring SPEAR. These results indicate the existence of three states chi, with masses 3415, 3500, and 3550 MeV, produced in radiative decays of psi'. There is evidence for a fourth state with mass either 3340 or 3455 MeV. From study of the psi(3684) inclusive photon spectrum, the branching fraction for psi(3684) .-->. .gamma. chi(3415) was determined to be 7.5 +- 2.6%. Branching fraction upper limits of 1 to 4% at the 90% confidence level were obtained for monochromatic photon production above 250 MeV by psi or psi'.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1993-07 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Fj(2220) in Radiative J/psi Decays by :
Download or read book Search for Fj(2220) in Radiative J/psi Decays written by and published by . This book was released on 2010 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for f{sub J}(2220) production in radiative J/[psi] 2![gamma]f{sub J}(2220) decays using 460 fb−1 of data collected with the BABAR detector at the SLAC PEP-II ee− collider. The f{sub J}(2220) is searched for in the decays to K+K− and K{sub S}°K{sub S}°. No evidence of this resonance is observed, and 90% confidence level upper limits on the product of the branching fractions for J/[psi] 2![gamma]f{sub J}(2220) and f{sub J}(2220) 2!K+K−(K{sub S}°K{sub S}°) as a function of spin and helicity are set at the level of 10−5, below the central values reported by the Mark III experiment.
Download or read book High Energy Physics Index written by and published by . This book was released on 1990 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1985 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rare B Decays to States Containing a J/psi by :
Download or read book Rare B Decays to States Containing a J/psi written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report preliminary measurements of the branching fractions for B[sup +] [yields] J/[psi][phi]K[sup +], B[sup 0] [yields] J/[psi][phi]K[sub S][sup 0], B[sup 0] [yields] J/[psi][phi], B[sup 0] [yields] J/[psi][eta] and B[sup 0] [yields] J/[psi][eta][prime] using 56 million B[bar B] events collected at the [Upsilon](4S) resonance with the BABAR detector at PEP-II. They measure branching fractions of [Beta](B[sup +] [yields] J/[psi][phi]K[sup +]) = (4.4 [+-] 1.4(stat) [+-] 0.7(syst)) x 10[sup -5] and [Beta](B[sup 0] [yields] J/[psi][phi]K[sub S][sup 0]) = (5.1 [+-] 1.9(stat) [+-] 0.9(syst)) x 10[sup -5], and set upper limits at 90% C.L. for branching fractions [Beta](B[sup 0] [yields] J/[psi][phi])
Book Synopsis A Search for Narrow States in Radiative Upsilon Decays by :
Download or read book A Search for Narrow States in Radiative Upsilon Decays written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for new states produced in radiative UPSILON(1S) decays is accomplished by observing the inclusive photon energy spectrum. A narrow resonance in the energy spectrum indicates the existence of a new state X produced by the process UPSILON .-->. .gamma. X. The analysis is based on approximately 0.44 x 106 UPSILON(1S) events produced at the DORIS II ee− storage ring. These data were collected with the Crystal Ball detector between April 1983 and May 1986. This analysis finds no evidence for a new state, so upper limits on the branching ratio BR(UPSILON .-->. .gamma. X) are derived, assuming the state X decays primarily to high-multiplicity hadronic final states. In particular, if the state X were a minimal Higgs particle, its primary decay mode would be to the heaviest fermion-antifermion pair energetically available. For the radiative UPSILON(1S) decays studied here, the heavy fermions would be c anti c or s anti s quark states, over most of the relevant Higgs' mass range. The resulting upper limit for BR(UPSILON(1S) .-->. .gamma. X) is highly energy dependent but for X mass between 1.5 GeV and 8.0 GeV, the 90% confidence level upper limit is better than 8.0 x 10−4. For a Higgs' mass near 5.0 GeV, the upper limit is about 2.0 x 10−4 which is approximately equal to the lowest order calculation for the Wilczek mechanism. The Wilczek calculation with QCD radiative corrections predict branching ratios below the limits set here for all Higgs' masses.
Book Synopsis Radiative Decays of the Psi Prime to All-photon Final States by :
Download or read book Radiative Decays of the Psi Prime to All-photon Final States written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of studies of selected radiative decays of the psi' to charmonium and non-charmonium states which decay into photons are presented. These studies were performed using a sample of 1.8 x 106 produced psi''s collected by the Crystal Ball detector at the SPEAR electron-positron storage ring. The branching ratios of the chi0, chi2, and eta'/sub c/ to two photons have been measured to be (4.5 +- 2.2 +- 2.0) x 10−4, (9.5 +- 2.9 +- 4.5) x 10−4 (first errors statistical, second systematic), and 1 x 10−2 (90% C.L.). The signal from the decay chain psi' .--. .gamma.chi0, chi0 .-->. .pi.°.pi.° has been observed with essentially no background. Using the observed line shape of the radiative photon in this reaction, the full width of the psi0 has been found to be 8.8 +- 1.3 +- 1.5 MeV/c2. In addition, the branching ratios of the chi0 and chi2 to .pi.°.pi.° have been measured to be (3.5 +- 0.3 +- 1.2) x 10−3 and (1.2 +- 0.2 +- 0.4) x 10−3; the branching ratios of the chi0 and chi2 to eta eta have been measured to be (2.8 +- 0.9 +- 1.3) x 10−3 and (8.4 +- 4.2 +- 4.0) x 10−4. The decays of the psi' to four non-charmonium states have been investigated. The branching ratios and upper limits of these decays have been normalized to the branching ratios of the corresponding decays from the J/psi which have been measured using a sample of 2.2 x 106 produced J/psi's collected by the Crystal Ball detector. The ratios of the psi' branching ratios to the J/psi branching ratios for the final states .gamma.eta, .gamma.eta', .gamma.theta, and .gamma.f have been measured to be
Book Synopsis Branching Fraction and Charge Asymmetry Measurements InB to J/psi Pi Pi Decays by :
Download or read book Branching Fraction and Charge Asymmetry Measurements InB to J/psi Pi Pi Decays written by and published by . This book was released on 2007 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors study the decays B° → J/???− and B+ → J/??+?°, including intermediate resonances, using a sample of 382 million B{bar B} pairs recorded by the BABAR detector at the PEP-II e+e− B factory. They measure the branching fractions?(B° → J/??°) = (2.7 ± 0.3 ± 0.17) x 10−5 and?(B+ → J/??+) = (5.0 ± 0.7 ± 0.31) x 10−5. The authors also set the following upper limits at the 90% confidence level:?(B° → J/??+?− non-resonant)
Book Synopsis Radiative Decays of the Psi' to All-photon Final States by :
Download or read book Radiative Decays of the Psi' to All-photon Final States written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A sample of 1.8 x 106 produced psi's collected by the Crystal Ball detector at SPEAR is used to measure branching ratios of selected radiative psi' decays to non-charmonium states which decay into photons. A sample of 2.2 x 106 produced J/psi's is used to measure the same radiative decays from the J/psi. The ratios BR(psi' .-->. .gamma.f)/BR(J/psi .-->. .gamma.f) = 9 +- 3%, BR(psi' .-->. .gamma.theta)/BR(J/psi .-->. .gamma.theta) 10% - 15%, BR(psi' .--. .gamma.eta)/BR(J/psi .-->. .gamma.eta) 1.8%, and BR(psi' .--. .gamma.eta')/BR(J/psi .-->. .gamma.eta')
Book Synopsis New States in the Decays of Psi(3095) and Psi(3684). [Branching Ratio]. by :
Download or read book New States in the Decays of Psi(3095) and Psi(3684). [Branching Ratio]. written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary analysis of new data on radiative decays of psi(3095) and psi(3684) confirms the existence of chi(3410) and of further structure in the 3.45 to 3.60 GeV region. The monochromatic photon from the transition psi(3684) .-->. .gamma.chi(3410) is observed in the inclusive photon spectrum from psi(3684); the branching ratio for this decay is 7 +- 3 percent. No evidence was found for a state near 2.8 GeV reached in psi(3095) decays.
Download or read book INIS Atomindex written by and published by . This book was released on 1987 with total page 1098 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Branching Fractions in Radiative BDecays to Eta K Gamma and Search for B Decays to Eta' K Gamma by : B. Aubert
Download or read book Measurement of Branching Fractions in Radiative BDecays to Eta K Gamma and Search for B Decays to Eta' K Gamma written by B. Aubert and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present measurements of the B {yields} {eta}K{gamma} branching fractions and upper limits for the B {yields} {eta}'K{gamma} branching fractions. For B{sup +} {yields} {eta}K{sup +}{gamma} they also measure the time-integrated charge asymmetry. The data sample, collected with the BABAR detector at the Stanford Linear Accelerator Center, represents 232 x 10{sup 6} produced B{bar B} pairs. The results for branching fractions and upper limits at 90% C.L. in units of 10{sup -6} are: {Beta}(B{sup 0} {yields} {eta}K{sup 0}{gamma}) = 11.3{sub -2.6}{sup +2.8} {+-} 0.6, {Beta}(B{sup +} {yields} {eta}K{sup +}{gamma}) = 10.0 {+-} 1.3 {+-} 0.5, {Beta}(B{sup 0} {yields} {eta}'K{sup 0}{gamma})
Download or read book Physics Briefs written by and published by . This book was released on 1988 with total page 1186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of The. Alpha. Sub 0 (980) Meson in Radiative J/. Psi. Decays by :
Download or read book A Study of The. Alpha. Sub 0 (980) Meson in Radiative J/. Psi. Decays written by and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using the decay sequence J/? →?X, X → a0{sup {plus minus}}(980)?{sup {minus plus}}, a0{sup {plus minus}}(980) →??{sup {plus minus}}, where X is the f1(1285) or?(1400), the?? vs??− Dalitz plot intensity distributions are fitted with a model containing a coupled-channel parametrization of the a0(980). Preliminary values for the spin of X, the mass and width of the a0{sup {plus minus}}(980) to??{sup {plus minus}}, and the ratio of a0+(980) coupling strengths, g{sub K}2/g{sub?}2, to {bar K}°K+ and??+ are determined. From this model, the predictions for the ratios of branching ratios r{sub X} = B(X → a0(980)?){center dot}B(a0(980) → K{bar K})/B(X → a0{sup {plus minus}}(980)?){center dot}B(a0{sup {plus minus}}(980) →??{sup {plus minus}}) are compared with those obtained from MARK III Partial Waves analyses of the decays J/? →?K{sub s}°K{sup {plus minus}}?{sup {minus plus}} and J/? →?{eta}?+?−. 12 refs., 3 figs., 4 tabs.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1983 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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