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Featured researches published by A. Bean.


Physics Letters B | 1987

A measurement of the tau lifetime

C. Bebek; K. Berkelman; E. Blucher; D. G. Cassel; T. Copie; R. DeSalvo; J. W. DeWire; R. Ehrlich; R. S. Galik; M. Gilchriese; B. Gittelman; S. W. Gray; A. M. Halling; D. L. Hartill; B. K. Heltsley; S. Holzner; J. Kandaswamy; R. Kowalewski; D. L. Kreinick; Y. Kubota; N. B. Mistry; J. Mueller; R. Namjoshi; E. Nordberg; D. Perticone; D. Peterson; M. Pisharody; K. Read; D. Riley; A. Silverman

The tau lepton lifetime is measured using four different methods with the DELPHI detector. Three measurements using one prong decays are combined, accounting for correlations, resulting in ττ=298 ±7 (stat.)±4 (syst.) fs while the decay length distribution of three prong decays gives ππ=298±13 (stat)±(syst.) fs. The combined result is ττ=298±7 fs. The ratio of the Fermi coupling constant from tau decay relative to that from muon decay is found to be 0.985±0.013, compatible with lepton universality.


Physical Review D | 1986

Study of the decay BX

M. S. Alam; N. Katayama; I. J. Kim; C. R. Sun; V. Tanikella; A. Bean; G. J. Bobbink; I. Brock; A. Engler; T. Ferguson; R.W. Kraemer; C. Rippich; R.B. Sutton; H. Vogel; C. Bebek; K. Berkelman; E. Blucher; D. G. Cassel; T. Copie; R. DeSalvo; J. W. DeWire; R. Ehrlich; R. S. Galik; M. Gilchriese; B. Gittelman; S. W. Gray; A. M. Halling; D. L. Hartill; B. K. Heltsley; S. Holzner

We have measured the inclusive branching ratio for B..-->..psiX to be (1.09 +- 0.16 +- 0.21)%, and the exclusive branching ratios for B/sup -/..-->..psiK/sup -/ and B-bar /sup 0/..-->..psiK-bar /sup *//sup 0/ to be (0.09 +- 0.05)% and (0.41 +- 0.18)%, respectively. The mass difference between neutral and charged B mesons is 1.1 +- 2.1 MeV, while the difference between the mass of UPSILON(4S) and twice the mean B-meson mass is 18.5 +- 3.0 MeV. The psi momentum distribution implies a substantial two-body decay (in agreement with direct measurements), but also some combination of B..-->..psiX with M/sub X/>1.5 GeV, and B..-->..psiX.


Physics Letters B | 1987

Measurement of the D0, D+ and Ds+ meson lifetimes at √s = 10.58 GeV

S. E. Csorna; M. D. Mestayer; R. S. Panvini; G. B. Word; A. Bean; G.J. Bobbink; I. Brock; A. Engler; T. Ferguson; R.W. Kraemer; C. Rippich; H. Vogel; C. Bebek; K. Berkelman; E. Blucher; D. G. Cassel; T. Copie; R. DeSalvo; J. W. DeWire; R. Ehrlich; R. S. Galik; M. Gilchriese; B. Gittelman; S. W. Gray; A. M. Halling; D. L. Hartill; B. K. Heltsley; S. Holzner; M. Ito; J. Kandaswamy

Abstract We have measured the lifetimes of the D0, D+ and Ds+ mesons with data from the CLEO detector. We find τD0 = (5.0 ± 0.7 ± 0.4) × 10−13s, τD+ = (11.4 ± 1.6 ± 0.7) × 10−13s and τDs+ = (4.7 ± 2.2 ± 0.5) × 10−13s, giving lifetime ratios τD+/τD0 = 2.3 ± 0.5 and τDs+/τD0 = 0.9 ± 0.5.


Physical Review Letters | 1986

Observation of the decay BFX

P. Haas; M. Hempstead; T. Jensen; H. Kagan; R. Kass; S. Behrends; T. Gentile; Jan M. Guida; Joan A. Guida; F. Morrow; R. Poling; C. Rosenfeld; E. H. Thorndike; P. Tipton; J. Green; R. Namjoshi; F. Sannes; R. Stone; M. S. Alam; N. Katayama; I. J. Kim; C. R. Sun; V. Tanikella; D. Bortoletto; A. Chen; L. Garren; M. Goldberg; N. Horwitz; A. Jawahery; P. Lubrano

We present evidence for inclusive F-italic-meson production in B-italic-meson decay. The product branching fraction B-italic(B-italic..-->..F-italicX-italic)B-italic(F-italic/sup +/..-->..phi..pi../sup +/) is measured to be 0.0038 +- 0.010. The F-italic momentum spectrum indicates the presence of a large component of two-body final states in the decay B-italic..-->..F-italicX-italic.


Physical Review D | 1988

Charm production in nonresonant e(+)e(-) annihilations at √s =10.55 GeV

D. Bortoletto; M. Goldberg; R. Holmes; N. Horwitz; A. Jawahery; P. Lubrano; G. C. Moneti; V. Sharma; I. P. J. Shipsey; P. Thoma; S. E. Csorna; T. Letson; M. D. Mestayer; R. S. Panvini; G. B. Word; A. Bean; G.J. Bobbink; I. Brock; T. Ferguson; R.W. Kraemer; H. Vogel; C. Bebek; K. Berkelman; E. Blucher; D. G. Cassel; T. Copie; R. DeSalvo; J. W. DeWire; R. Ehrlich; R. S. Galik


Physical Review D | 1987

Improved upper limit on flavor-changing neutral-current decays of the b quark

A. Bean; G. J. Bobbink; I. Brock; A. Engler; T. Ferguson; R. W. Kraemer; C. Rippich; H. Vogel; C. Bebek; K. Berkelman; E. Blucher; D. G. Cassel; T. Copie; R. DeSalvo; J. W. DeWire; R. Ehrlich; R. S. Galik; M. G. D. Gilchriese; B. Gittelman; S. W. Gray; A. M. Halling; D. L. Hartill; B. K. Heltsley; S. Holzner; J. Kandaswamy; R. Kowalewski; D. L. Kreinick; Y. Kubota; N. B. Mistry; J. Mueller


Physical Review D | 1987

Exclusive decays and masses of the B mesons

C. Bebek; K. Berkelman; E. Blucher; D. G. Cassel; T. Copie; R. DeSalvo; J. W. DeWire; R. Ehrlich; R. S. Galik; M. G. D. Gilchriese; B. Gittelman; S. W. Gray; A. M. Halling; D. L. Hartill; B. K. Heltsley; S. Holzner; M. Ito; J. Kandaswamy; R. Kowalewski; D. L. Kreinick; Y. Kubota; N. B. Mistry; J. Mueller; R. Namjoshi; S. Nandi; E. Nordberg; M. Ogg; D. Perticone; Dean E. Peterson; M. Pisharody


Physical Review D | 1987

INCLUSIVE B MESON DECAYS INTO CHARM

D. Bortoletto; A. Chen; L. Garren; M. Goldberg; R. Holmes; Nahmin Horwitz; A. Jawahery; P. Lubrano; G. C. Moneti; V. Sharma; S. E. Csorna; M. D. Mestayer; R. S. Panvini; G. B. Word; A. Bean; G. J. Bobbink; I. Brock; A. Engler; T. Ferguson; R. W. Kraemer; C. Rippich; R.B. Sutton; H. Vogel; C. Bebek; K. Berkelman; E. Blucher; D. G. Cassel; T. Copie; R. DeSalvo; J. W. DeWire


Physical Review Letters | 1986

Upper limits for the production of light short-lived neutral particles in radiative Upsilon decay.

T. Bowcock; R. T. Giles; J. Hassard; K. Kinoshita; F. M. Pipkin; Richard Wilson; T. Gentile; P. Haas; M. Hempstead; T. Jensen; H. Kagan; R. Kass; S. Behrends; Jan M. Guida; Joan A. Guida; F. Morrow; R. Poling; C. Rosenfeld; E. H. Thorndike; P. Tipton; J. Green; F. Sannes; R. Stone; M. S. Alam; N. Katayama; I. J. Kim; C. R. Sun; V. Tanikella; D. Bortoletto; A. Chen


Physical Review D | 1985

New determination of the Michel parameter in tau decay

S. Behrends; T. Gentile; Jan M. Guida; Joan A. Guida; F. Morrow; R. Poling; C. Rosenfeld; E. H. Thorndike; P. Tipton; D. Besson; J. Green; R. Namjoshi; F. Sannes; P. Skubic; R. Stone; D. Bartoletto; A. Chen; L. Garren; M. Goldberg; Nahmin Horwitz; A. Jawahery; P. Lubrano; G. C. Moneti; C. G. Trahern; H. W. van Hecke; S. E. Csorna; M. D. Mestayer; R. S. Panvini; G. B. Word; Xia Yi

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