Download or read book Hadronic 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 written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: During 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].

Download or read book Hadronic Decays of Dsub S Meson and a Model independent Determination of the Branching Fraction for the Dsub S Decay of the Phi Pi written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hadronic Decays of the DS Meson and a Model independent Determination of the Branching Fraction for the DS Decay to Phi Pi written by John Nicholas Synodinos and published by . This book was released on 1995 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hadronic Decays of the D sub S Meson written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The 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.

Download or read book Recent Results on Hadronic D sub S and D Meson Decays from the Mark III written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Partial Reconstruction of Bz to Dss Dstarm Decays and Measurement of the Ds to Phi Pip Branching Fraction written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary results are presented on the branching fractions B (B[sup 0] --> D[sub s][sup *+]D[sup *-]) and B (D[sub s][sup +] --> [phi][pi][sup +]), based on a data sample of approximately 124 x 10[sup 6] B[bar B] events collected by the BABAR detector at the PEP-II e[sup +]e[sup -] B-factory. B (B[sup 0] --> D[sub s][sup *+]D[sup *-]) is measured selecting neutral B meson decays to the final state D[sup *-]D[sub s][sup *+] with partial reconstruction of the D[sub s][sup *+], in which only the D[sup *-] and the soft photons from the decay D[sub s][sup *+] --> D[sub s][sup +][gamma] are reconstructed. The branching fraction product B (B[sup 0] --> D[sub s][sup *+]D[sup *-]) [center-dot] B(D[sub s][sup +] --> [phi][pi][sup +]) is measured via a complete reconstruction of the whole decay chain. Comparing these two measurements provides a model-independent determination of the B (D[sub s][sup +] --> [phi][pi][sup +]) branching fraction. The authors obtain the following preliminary results: B(B[sup 0] --> D[sub s][sup *+]D[sup *-]) = (1.85 [+-] 0.09 [+-] 0.16)%; B(D[sub s][sup +] --> [phi][pi][sup +]) = (4.71 [+-] 0.47 [+-] 0.35)% where the first error in each measurement is statistical, the second systematic.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 1684 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book INIS Atomindex written by and published by . This book was released on 1988 with total page 1022 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book B Decays to Hadronic Final States Including D sub S sup and D written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The e[sup+]e[sup -] annihilation data recorded with the BABAR detector has been used to study B decays to D[sub s][sup (*)[+-]] and D*[sup+-] mesons. The production fraction of inclusive D[sub s][sup (*)[+-]] and the corresponding momentum spectra have been determined. Exclusive decays B[sup 0][yields] D*[sup -] D[sub s][sup (*)+] have been identified with a partial reconstruction technique and their branching fractions have been measured. We also report branching fraction measurements for the exclusive hadronic modes B[sup 0][yields] D*[sup -][pi][sup+] and B[sup 0][yields] D*[sup -][rho][sup+].

Download or read book Measurement of Ds and Ds Production in B Meson Decays and from Continuum E e Annihilation at Sqrt s written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: New measurements of D[sub s][sup+] and D*[sub s][sup+] meson production rates from B decays and from q[bar q] continuum events near the[Upsilon](4S) resonance are presented. Using 20.8 fb[sup -1] of data on the[Upsilon](4S) resonance and 2.6 fb[sup -1] off resonance, we find the inclusive branching fractions[Beta](B[yields] D[sub s][sup+]X)= (10.93[+-] 0.19[+-] 0.58[+-] 2.73)% and[Beta](B[yields] D*[sub s][sup+] X)= (7.9[+-] 0.8[+-] 0.7[+-] 2.0)%, where the first error is statistical, the second is systematic, and the third is due to the D[sub s][sup+][yields][phi][pi][sup+] branching fraction uncertainty. The branching fractions[Sigma][Beta](B[yields] D(*)[sub s][sup+][bar D](*))= (5.07[+-] 0.14[+-] 0.30[+-] 1.27)% and[Sigma][Beta](B[yields] D*[sub s][sup+][bar D](*))= (4.1[+-] 0.2[+-] 0.4[+-] 1.0)% are determined from the D(*)[sub s][sup+] momentum spectra.

Download or read book Study of Ds Decays written by and published by . This book was released on 1989 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the spectator model, the lowest lying bound state of the charm-strange quarks, the Ds meson, is predicted to decay via W emission from the charm quark and form states with s{bar s} hidden strangeness. The conventional hadronic modes will contain K{bar K}, [phi] and the f0(975), which is considered to be the J{sup pc} = 0{sup ++} isoscalar s{bar s} meson. Hadronic decays of the Ds meson have been measured in relatively few modes and all modes are measured relative to the [phi][pi] mode. In this paper, an upper limit for the absolute branching ratio of the Ds decay into the [phi][pi] mode and evidence for the decay, Ds → f0(975)[pi] is presented from the Mark III. 26 refs., 4 figs.

Download or read book D Meson Hadronic Decays at CLEO c written by and published by . This book was released on 2011 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 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.

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book B Decays to D and D sub S sup written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The e[sup+]e[sup -] annihilation data recorded with the BABAR detector has been used to study B[sup 0] decays to D[sub s][sup (*)+] and D[sup*-] mesons. The production fraction of inclusive D[sub s][sup (*)+] and the corresponding momentum spectra have been determined. Exclusive decays B[sup 0][yields] D[sup*-] D[sub s][sup (*)+] have been identified with a partial reconstruction technique and their branching ratios have been measured. Fully reconstructed B[sup 0] decays in the hadronic modes B[sup 0][yields] D[sup*-][pi][sup+] and B[sup 0][yields] D[sup*-][rho][sup+] have been also studied and the measurement of their absolute branching fractions is reported.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1996 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement Of B D sub S D and Determination of the D sub S Branching Fraction with a Partial Reconstruction Method written by and published by . This book was released on 2003 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present model-independent measurements of the branching fractions?(B° → D*{sub s} D*−) and?(D{sub s}+ →??+) based on 19.3 fb−1 of data collected by the BABAR detector at the PEP-II e+e− B Factory. Neutral B-meson decays to the D*{sub s}+D*− final state are selected with a partial reconstruction of the D*{sub s}+; that is, only the D*− and the soft photon from the decay D*{sub s}+ → D{sub s}+? are reconstructed. The branching fraction?(B° → D*{sub s}+ D*−) is extracted from these event yields, while?(D{sub s}+ →??+) is determined by combining this result with a previous measurement of the product?(B° → D*{sub s}+ D*−) x?(D{sub s}+ →??+) with partial reconstruction of the D*−. They obtain the following preliminary results:?(B° → D*{sub s}+ D*−) = (1.50 ± 0.16 ± 0.12)%,?(D{sub s}+ →??+) = (4.7 ± 0.6 ± 0.8)% where the first error is statistical, and the second systematic.

Download or read book MEASUREMENT OF B0 D S D BRANCHING FRACTIONS AND POLARIZATION IN THE DECAY B0 DS FILE WITH A PARTIAL RECONSTRUCTION TECHNIQUE written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present measurements of the decays B[sup 0][yields] D[sub s][sup (*)+] D*[sup -], using data recorded by the BABAR detector in 1999 and 2000, consisting of 20.8 fb[sup -1]. The analysis is conducted with a partial reconstruction technique, in which only the D[sub s][sup (*)+] and the soft pion from the D*[sup -] decay are reconstructed. From the observed rates, we measure the branching fractions[Beta](B[sup 0][yields] D[sub s][sup+] D*[sup -])= (1.03[+-] 0.14[+-] 0.13[+-] 0.26)% and[Beta](B[sup 0][yields] D*[sub s][sup+] D*[sup -])= (1.97[+-] 0.15[+-] 0.30[+-] 0.49)%, where the first error is statistical, the second is systematic, and the third is the error due to the D[sub s][sup+][yields][phi][pi][sup+] branching fraction uncertainty. From the[Beta](B[sup 0][yields] D*[sub s][sup+] D*[sup -]) angular distributions, we measure the fraction of longitudinal polarization[Lambda][sub L]/[Lambda]= (51.9[+-] 5.0[+-] 2.8)%, which is consistent with the theoretical prediction, based on factorization. These results are preliminary.