Preliminary Measurement of D{sup *}/D Production and D{sup *} Spin Alignment at the Z° Resonance PDF Download
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Languages : en
Pages : 9
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USING HADRONIC Z° DECAYS RECORDED BY THE SLD EXPERIMENT AT SLAC, WE HAVE MEASURED THE VECTOR/(VECTOR+PSEUDOSCALAR) PRODUCTION RATIO, V/(V + P), FOR THE PROMPT CHARMED MESONS D{sup *+} AND D. USING THE CHANNELS D{sup *+} → D°?+{sub S}, D° → K−?+, AND D° → K−?+?−?+, AS WELL AS D+ → K−?+?−, WE FIND V/(V + P) = 0.61 +/- 0.09(STAT.) +/- 0.03(BR), WHICH DISFAVORS THE EXPECTATION OF 0.75 FROM NAIVE SPIN COUNTING. WE HAVE ALSO MEASURED THE DEGREE OF D{sup *+} SPIN ALIGNMENT ALONG THE FLIGHT DIRECTION AND FIND IT TO BE CONSISTENT WITH ZERO FOR D{sup *+} FRACTIONAL MOMENTA x = E{sub D*}/E{sub BEAM}
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Languages : en
Pages : 9
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Book Description
USING HADRONIC Z° DECAYS RECORDED BY THE SLD EXPERIMENT AT SLAC, WE HAVE MEASURED THE VECTOR/(VECTOR+PSEUDOSCALAR) PRODUCTION RATIO, V/(V + P), FOR THE PROMPT CHARMED MESONS D{sup *+} AND D. USING THE CHANNELS D{sup *+} → D°?+{sub S}, D° → K−?+, AND D° → K−?+?−?+, AS WELL AS D+ → K−?+?−, WE FIND V/(V + P) = 0.61 +/- 0.09(STAT.) +/- 0.03(BR), WHICH DISFAVORS THE EXPECTATION OF 0.75 FROM NAIVE SPIN COUNTING. WE HAVE ALSO MEASURED THE DEGREE OF D{sup *+} SPIN ALIGNMENT ALONG THE FLIGHT DIRECTION AND FIND IT TO BE CONSISTENT WITH ZERO FOR D{sup *+} FRACTIONAL MOMENTA x = E{sub D*}/E{sub BEAM}
![Preliminary Measurement of D[sup*]/D Production and D[sup*] Spin Alignment at the Z[sup 0] Resonance PDF](https://books.google.com/books/content/images/frontcover/tkqJDAEACAAJ?fife=w80-h100)
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Languages : en
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Book Description
USING HADRONIC Z[sup 0] DECAYS RECORDED BY THE SLD EXPERIMENT AT SLAC, WE HAVE MEASURED THE VECTOR/(VECTOR+PSEUDOSCALAR) PRODUCTION RATIO, V/(V+ P), FOR THE PROMPT CHARMED MESONS D[sup*+] AND D[sup+]. USING THE CHANNELS D[sup*+][yields] D[sup 0][pi][sup+][sub S], D[sup 0][yields] K[sup -][pi][sup+], AND D[sup 0][yields] K[sup -][pi][sup+][pi][sup -][pi][sup+], AS WELL AS D[sup+][yields] K[sup -][pi][sup+][pi][sup -], WE FIND V/(V+ P)= 0.61+/- 0.09(STAT.)+/- 0.03(BR), WHICH DISFAVORS THE EXPECTATION OF 0.75 FROM NAIVE SPIN COUNTING. WE HAVE ALSO MEASURED THE DEGREE OF D[sup*+] SPIN ALIGNMENT ALONG THE FLIGHT DIRECTION AND FIND IT TO BE CONSISTENT WITH ZERO FOR D[sup*+] FRACTIONAL MOMENTA x= E[sub D*]/E[sub BEAM][gt] 0.2. We compare these results with QCD model predictions.
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Category :
Languages : en
Pages : 19
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Using hadronic Z° decays recorded by the SLD experiment at SLAC, we have measured the vector/(vector+pseudoscalar) production ratio, V/(V+P), for the prompt charmed mesons, D{sup *+} and D. Using the channels D{sup *+}→D°?+{sub s}, D°→ K−?+, and D°→ K{sup - }?+?−?+, as well as D+??2192? K−?+?−, we find V/(V+P) = 0.57 ± 0.07 ({ital stat})± 0.02({ital BR}), which disfavors the expectations of 0.75 from naive spin counting. We have also measured the degree of D{sup *+} spin alignment along the flight direction and find it to be consistent with the zero for D{sup *+} fractional momenta? {triple_bond} E{sub D{sup *}}/D{sub {ital beam}}
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Category :
Languages : en
Pages : 24
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The authors have measured the production rates as a function of scaled energy x of prompt charmed pseudoscalar D{sup ±} and vector D*{sup ±} mesons in hadronic Z° decays. The prompt signal components were isolated from the background of D mesons from B hadron decays using impact parameters of reconstructed D{sup ±} → K{sup {minus_plus}}?{sup ±}?{sup ±} and D*-daughter D° → K−? and D° → K−?+?−?+ candidates. Using the combined meson production rates the authors have measured the fraction of hadronic Z° decays into c{bar c}, R{sub c} = 0.182 {+-} 0.027 (stat.) {+-} 0.012 (syst.) (Preliminary). Comparison of the D*{sup {+-}} and D{sup {+-}} rates gives a direct probe of vector (V) vs. pseudoscalar (P) meson production for charmed quarks, and for x> 0.4 they have measured P{sub V} = V/(V + P) = 0.65 {+-} 0.09(stat.) {+-} 0.03(syst.) {+-} 0.03 (BR) (Preliminary). They have measured the degree of spin alignment of the D*{sup {+-}} mesons along their flight direction and find it to be consistent with zero. They compared the latter two results with QCD- and model-based predictions of charm-quark jet fragmentation.
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Category : Aeronautics
Languages : en
Pages : 994
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Book Description
![Measurements of Spin-sensitive Quantities in Hadronic Decays of Z[sup 0] Bosons Produced in E[sup +]e[sup [minus] Annihilations PDF](https://books.google.com/books/content/images/frontcover/vwWlnQAACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages : 5
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In 1992 the SLD experiment at SLAC collected over 11,000 hadronic decay events of Z[sup 0] bosons produced in collisions of polarised electrons with unpolarised positrons delivered by the SLC. Preliminary experimental results are presented on tests of the value of the gluon spin involving events containing three hadronic jets measured in the final state. A leading order QCD prediction is found to be in agreement with the data, whilst a model including scalar gluons is clearly excluded. Effects of the electron beam polarisation upon the orientation of the three-jet event plane are discussed.
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Category :
Languages : en
Pages : 26
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We have measured production of?{sup {+-}},?{sup {+-}}, {ital p}/{ital {bar p}},?° and?°/{bar?}° as a function of momentum in inclusive hadronic {ital Z}° decay events and separately in events containing primary light-({ital uds}) and {ital b}-quarks. The SLD Cherenkov Ring Imaging Detector was used to identify charged pions, kaons, and protons over most of the available momentum range 0.8>{ital p}>33 GeV/c. The neutral?°{sub s} and {Lambda}° were reconstructed using the??− and {ital p}?− decay modes, respectively. We present the first comparisons of momentum of charged tracks measured in the SLD Vertex Detector. Substantial differences are observed, consistent with the kinematics of {ital B}-hadron production in Z° decays and the properties of {ital B}-hadron decays as measured at lower energies.
Author: Donald H. Perkins
Publisher: Cambridge University Press
ISBN: 1139643371
Category : Science
Languages : en
Pages : 454
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Book Description
This highly-regarded text provides a comprehensive introduction to modern particle physics. Extensively rewritten and updated, this 4th edition includes developments in elementary particle physics, as well as its connections with cosmology and astrophysics. As in previous editions, the balance between experiment and theory is continually emphasised. The stress is on the phenomenological approach and basic theoretical concepts rather than rigorous mathematical detail. Short descriptions are given of some of the key experiments in the field, and how they have influenced our thinking. Although most of the material is presented in the context of the Standard Model of quarks and leptons, the shortcomings of this model and new physics beyond its compass (such as supersymmetry, neutrino mass and oscillations, GUTs and superstrings) are also discussed. The text includes many problems and a detailed and annotated further reading list.
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Category : Nuclear energy
Languages : en
Pages : 794
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Book Description
Author: Richard B. M. Schasfoort
Publisher: Royal Society of Chemistry
ISBN: 1782627308
Category : Science
Languages : en
Pages : 555
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Book Description
Surface plasmon resonance (SPR) plays a dominant role in real-time interaction sensing of biomolecular binding events, this book provides a total system description including optics, fluidics and sensor surfaces for a wide researcher audience.
