Average and Individual B Hadron Lifetimes at CDF. PDF Download
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Languages : en
Pages : 8
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Bottom hadron lifetime measurements have been performed using B → J/[psi] → [mu]+[mu]−X dacays recorded with the collider Detector at Fermilab (CDF) during the first half of the 1992--1993 Tevatron collider run. These decays have been reconstructed in a silicon vertex detector. Using 5344 ± 73 inclusive J/[psi] events, the average lifetime of all bottom hadrons produced in 1.8 TeV p{bar p} collisions and decaying into a J/[psi] events, the average lifetime of all bottom hadrons produced in 1.8 TeV p{bar p} collisions and decaying into a J/[psi] is found to be 1.46 ± 0.06(stat) ±0.06(sys)ps. The charged and neutral B meson lifetimes have been measured separately using 75 ±10 (charged) and 61±9 (neutral) fully reconstructed decays; preliminary results are [tau]{sup ±} = 1.63 ± 0.21(stat) ± 0.16(sys) ± 0. 10(sys) ps, yielding a lifetime ratio of [tau]{sup ±}/[tau]° = 1.06{plus_minus} 0.20(stat){plus_minus}0.12(sys).
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Category :
Languages : en
Pages : 8
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Book Description
Bottom hadron lifetime measurements have been performed using B → J/[psi] → [mu]+[mu]−X dacays recorded with the collider Detector at Fermilab (CDF) during the first half of the 1992--1993 Tevatron collider run. These decays have been reconstructed in a silicon vertex detector. Using 5344 ± 73 inclusive J/[psi] events, the average lifetime of all bottom hadrons produced in 1.8 TeV p{bar p} collisions and decaying into a J/[psi] events, the average lifetime of all bottom hadrons produced in 1.8 TeV p{bar p} collisions and decaying into a J/[psi] is found to be 1.46 ± 0.06(stat) ±0.06(sys)ps. The charged and neutral B meson lifetimes have been measured separately using 75 ±10 (charged) and 61±9 (neutral) fully reconstructed decays; preliminary results are [tau]{sup ±} = 1.63 ± 0.21(stat) ± 0.16(sys) ± 0. 10(sys) ps, yielding a lifetime ratio of [tau]{sup ±}/[tau]° = 1.06{plus_minus} 0.20(stat){plus_minus}0.12(sys).
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Category :
Languages : en
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Book Description
Measurements of the average b-hadron lifetime using inclusive B [yields] J/[psi]X events, the individual B[sub u] and B[sub d] lifetimes and their ratio using exclusive B [yields] [psi]K events, and the B[sub s] lifetime using semileptonic B[sub s] lifetime using semileptonic B[sub s] [yields] l[nu]D[sub 3]X events are presented. The results were obtained from a 21.3 pb[sup [minus]1] sample of [radical]s = 1.8 TeV [bar p]p collisions collected in 1992--93 at the Fermilab Tevatron collider and required the precise position measurements of the recently installed CDF silicon vertex detector.
Author: D. I. Britton
Publisher: Atlantica Séguier Frontières
ISBN: 9782863321553
Category : Heavy particles (Nuclear physics)
Languages : en
Pages : 732
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Author: D Bisello
Publisher: World Scientific
ISBN: 9814547026
Category :
Languages : en
Pages : 814
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The proceedings of this series of annual symposia represent an extensive summary of the experimental and theoretical status of high energy physics at hadron colliders. This volume discusses the latest results on top and beauty physics, QCD, electroweak physics and searches for new particles. The prospects of this field for LHC, Tevatron and Hera machines are also reported.
Author: Catherine Vander Velde
Publisher: World Scientific
ISBN: 9814547700
Category :
Languages : en
Pages : 1042
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Book Description
Author: K. Kondo
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 494
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 444
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Author: Michael C. Birse
Publisher: World Scientific
ISBN: 9814532037
Category : Hadron spectroscopy
Languages : en
Pages : 592
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Book Description
Author: K Huitu
Publisher: CRC Press
ISBN: 9780750306614
Category : Science
Languages : en
Pages : 1112
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Book Description
High Energy Physics 99 contains the 18 invited plenary presentations and 250 contributions to parallel sessions presented at the International Europhysics Conference on High Energy Physics. The book provides a comprehensive survey of the latest developments in high energy physics. Topics discussed include hard high energy, structure functions, soft interactions, heavy flavor, the standard model, hadron spectroscopy, neutrino masses, particle astrophysics, field theory, and detector development.
Author: Thomas E Browder
Publisher: World Scientific
ISBN: 9814602760
Category :
Languages : en
Pages : 528
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Book Description
CP violation is one of the most subtle effects in the Standard Model of particle physics and may be the first clue to the physics that lies beyond. Charge conjugation, C, and parity, P, are symmetries of particle interactions. C corresponds to the operation of replacing a particle by its antiparticle, while P is the operation of mirror reflection. Before 1956, it was believed that these were also symmetries of the interactions of elementary particles. In 1956, C S Wu found evidence for P violation in the weak interaction. Theorists proposed that the combination of CP would be a symmetry of the weak interaction. In 1964, Christenson, Cronin, Fitch and Turlay found the first evidence for the violation of CP symmetry in the decays of kaons.Although Kobayashi and Maskawa then showed how the Standard Model can accommodate the observed CP violation, Wolfenstein pointed out that it is also possible that there is a new interaction in addition to the usual four, called the superweak interaction, which is responsible for the asymmetry. To test this idea, the observation of a different type of asymmetry, called direct CP violation, is required; in the kaon sector, very precise measurements of the ratio of kaon decay rates are necessary. In B decay modes where a second order weak process whimisically named “penguin” interferes with another suppressed, first order “tree” amplitude, it may also be possible to observe these direct CP-violating effects.B physics and CP violation is now one of the major growth areas in high energy physics. Nearly every major high energy physics laboratory now has a project underway to observe the large CP asymmetries expected in the B sector and to test the consistency of the Standard Model. The unitarity of the Kobayashi-Maskawa mixing matrix in the Standard Model implies the existence of three phases, called alpha, beta and gamma, which can be determined by the measurements of CP asymmetries in B decays. About 200 participants gathered in Hawaii in March 1997 to discuss the progress in the field, and this important book constitutes the proceedings of that conference.
