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| Author | : Larry Donnie Gladney |
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| Total Pages | : 314 |
| Release | : 1985 |
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| Release | : 1985 |
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Results are presented on the use of a high-resolution drift chamber in the Mark II Detector at PEP to measure the lifetimes of D° and D/sup + -/ mesons produced in ee− annihilations at 29 GeV. Based on a sample of 74 events for the D° mesons and 23 events for the D/sup + -/ mesons, the lifetimes are found to be tau/sub D° = 4.7/sub -0.8//sup +0.9/ +- 0.5 x 10−13 s; tau/sub D/sup + -// = 8.9/sub -2.7//sup +3.8/ +- 1.3 x 10−13 s. The ratio of these lifetimes, tau/sub D°//tau/sub D/sup + -// = 1.9/sub -0.7//sup +0.9/ +- 0.3, indicates that the decays of these mesons cannot be explained by the simple spectator model of charmed particle decay.
| Author | : John Mark Butler |
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| Total Pages | : 274 |
| Release | : 1986 |
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| Release | : 1986 |
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In an exposure of the SLAC Hybrid Facility (SHF) to a backward scattered laser beam, 136 charm events produced in .gamma.p interactions at 20 GeV have been observed. The SHF 1 m bubble chamber was equipped with a High Resolution Optics camera in order to detect directly the production and decay of charm particles. After imposing rigorous cuts, 48 charged, 50 neutral, and 2 topologically ambiguous decays remain. Using a novel method for estimating the momentum of unconstrained decays, the D meson lifetimes from this sample are measured to be tau/sub D sup +-/ = (8.6 +- 1.3/sub -0.3//sup +0.8/) x 10−13 sec and tau/sub D°/ = (6.1 +- 0.9 +- 0.3) x 10−13 sec with a ratio of R = tau/sub D sup +-/[tau]sub D°/ = (1.4 +- 0.3/sub -0.1//sup +0.2/). This value of R indicates the Spectator Model charm particle decay mechanism is the dominate piece in the D/sub +-/ and D° decay rates. Limits are placed on additional contributions to the D decay rates from other processes including W-Exchange, Final State Interactions, and Pauli Principle Interference. 34 refs., 41 figs.
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| Author | : Alan Richard Spies |
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| Total Pages | : 0 |
| Release | : 1994 |
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| Author | : David K. Clark |
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| Total Pages | : 93 |
| Release | : 2010 |
| Genre | : Lepton-hadron interactions |
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| Author | : Billy E Bonner |
| Publisher | : World Scientific |
| Total Pages | : 1140 |
| Release | : 1990-11-19 |
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| ISBN | : 9814583642 |
DPF 90 at Rice University was planned as a major conference of truly international character which reviews recent developments in all areas of particle physics. Plenary session topics include new results from SLC, LEP, pp colliders, Heavy Quark Physics, High Energy Astrophysics. Two-day mini-conferences were held on the following subjects: Electroweak Physics, QCD and Hadron Physics, Theory Beyond the Standard Model, Non-accelerator Physics.
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| Total Pages | : 872 |
| Release | : 1988 |
| Genre | : Power resources |
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| Author | : Catherine Vander Velde |
| Publisher | : World Scientific |
| Total Pages | : 1042 |
| Release | : 1996-05-28 |
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| ISBN | : 9814547700 |
