H. Bossy
University of California, Berkeley
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Featured researches published by H. Bossy.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1992
E. Aker; C. Amsler; I. Augustin; C.A. Baker; B. M. Barnett; C.J. Batty; R. Beckmann; P. Birien; J. Bistirlich; Philipp Blum; R. Bossingham; H. Bossy; K. Braune; D.V. Bugg; Mark J. Burchell; T. Case; S. Cierjacks; K.M. Crowe; K. Dederichs; M. Doser; W. Dünnweber; H. Emerich; D. Engelhardt; M. Faessler; C. Felix; G. Folger; J. Friedrich; R. Hackmann; R.P. Haddock; H. Hammer
The crystal Barrel spectrometer used at LEAR, CERN to study the products of pd annihilations is described. A 1380 element array of Csl crystals measures photons from the decay of π0, η, η′ and ω mesons. A segmented drift chamber in a 1.5T magnetic field is used to identify and measure charged particles. A fast on-line trigger on charged and neutral multiplicities and on the invariant mass of secondary particles is available. The performance of the detector is discussed.
Physics Letters B | 1991
E. Aker; C. Amsler; I. Augustin; C. A. Baker; B. M. Barnett; C. J. Batty; R. Beckmann; P. Birien; J. Bistirlich; Philipp Blum; R. Bossingham; H. Bossy; K. Braune; Mark J. Burchell; T. Case; S. Cierjacks; K.M. Crowe; K. Dederichs; W. Dünnweber; D. Engelhardt; M. Faessler; C. Felix; G. Folger; R.P. Haddock; F.-H. Heinsius; N. P. Hessey; P. Hidas; P. Illinger; D. Jamnik; H. Kalinowsky
Abstract Antiproton-proton annihilations at rest into 3 π 0 are analyzed in terms of π 0 π 0 final state interactions. A J PC = 2 + + resonance at a mass of 1515 ± 10 MeV with a width of 120 ± 10 MeV is required to explain the data. This result is supported by previous observations made on the ππ system in p p and p n annihilations which show that the resonance has I = 0. This resonance is practically degenerate in mass with the f′ 2 (1525) but the two resonances have very different production and decay characteristics.
Physics Letters B | 1992
C. Amsler; C. J. Batty; D.V. Bugg; C. Kolo; B. Schmid; U. Wiedner; K.M. Crowe; M. Suffert; A. Cooper; D. Walther; D. Jamnik; D. Engelhardt; R. Landua; P. Hidas; H. Kalinowsky; N. P. Hessey; E. Schäfer; Chr. Strassburger; L. Montanet; E. Klempt; R.P. Haddock; W. Dünnweber; M. Merkel; U. Strohbusch; S. Ravndal; Mark J. Burchell; R. Bossingham; S. Spanier; C. Völcker; G. Folger
Abstract The results of a measurement of pp annihilation at rest into ηηπ 0 are presented. Assuming a resonance dominated model for the annihilation process an isoscalar J PC =0 ++ resonance decaying into ηη is observed with a mass of 1560±25 MeV/ c 2 and a width of 245±50 MeV/ c 2 .
Physics Letters B | 1993
C. Amsler; D.S. Armstrong; I. Augustin; C. A. Baker; B.M. Barnett; C. J. Batty; K. Beuchert; P. Birien; J. Bistirlich; Philipp Blum; R. Bossingham; H. Bossy; K. Braune; J. Brose; D.V. Bugg; Mark J. Burchell; T. Case; S. U. Chung; A. Cooper; K.M. Crowe; H.P. Dietz; S.v. Dombrowski; M. Doser; W. Dünnweber; D. Engelhardt; M. Englert; M. Faessler; C. Felix; G. Folger; R. Hackmann
The annihilation channel pp → ωπ0π0, where ω decays to π0γ, was studied with antiprotons stopped in liquid hydrogen. This reaction is dominated by the production of b10(1235) with contributions from f2(1270) and the ππ S-wave. The branching ratio for pp → ωπ0π0 is (2.00±0.21)% of all annihilations. The branching ratios for b10(1235)π0 (b1 → ωπ0) and f2(1270)ω (f2 → π0π0) are (0.92 ± 0.11)% and (0.57 ± 0.07)% of all annihilations, respectively. Upper limits for the production of vector mesons decaying to ωπ are given and the ππ mass distribution around 1 GeV is discussed.
Physics Letters B | 1993
C. Amsler; D.S. Armstrong; I. Augustin; C. A. Baker; B.M. Barnett; C. J. Batty; K. Beuchert; P. Birien; J. Bistirlich; Philipp Blum; R. Bossingham; H. Bossy; K. Braune; J. Brose; D.V. Bugg; Mark J. Burchell; T. Case; S. U. Chung; A. Cooper; K.M. Crowe; H.P. Dietz; S.v. Dombrowski; M. Doser; W. Dünnweber; D. Engelhardt; M. Englert; M. Faessler; C. Felix; G. Folger; R. Hackmann
Abstract Radiative p p annihilation at rest into γγ , γπ 0 , γη , γω and γη′ has been measured with the Crystal Barrel detector at LEAR for antiprotons stopped in liquid hydrogen. The branching ratios are B γπ 0 =(44±4)×10 −6 , B γη =(9.3±1.4)×10 −6 and B γω =(68±18)×10 −6 , respectively. For B γγ and B γη ′ we find new upper limits of 0.63×10 −6 and 12×10 −6 (95% CL), respectively.
Nuovo Cimento Della Societa Italiana Di Fisica A-nuclei Particles and Fields | 1994
C. Amsler; D.S. Armstrong; I. Augustin; C. A. Baker; B.M. Barnett; C. J. Batty; K. Beuchert; P. Birien; Philipp Blum; R. Bossingham; H. Bossy; K. Braune; J. Brose; D.V. Bugg; Mark J. Burchell; T. Case; A. Cooper; O. Cramer; K.M. Crowe; H.P. Dietz; S. von Dombrowski; M. Doser; W. Dünnweber; D. Engelhardt; M. Englert; M. Faessler; C. Felix; G. Folger; R. Hackmann; R. P. Haddock
SummaryInvestigations of purely neutral final states in
Nuovo Cimento Della Societa Italiana Di Fisica A-nuclei Particles and Fields | 1994
C. Felix; C. J. Batty; D.V. Bugg; R.P. Haddock; J. Luedemann; C. Kolo; W. Dünnweber; U. Wiedner; J. Brose; K.M. Crowe; B. Kaemmle; M. Suffert; D. Walther; D. Jamnik; D. Engelhardt; R. Landua; P. Hidas; H. Kalinowsky; N. P. Hessey; C. Strassburger; L. Montanet; J. Salk; E. Klempt; O. Cramer; M. Merkel; U. Strohbusch; S. Ravndal; Mark J. Burchell; R. Bossingham; S. Spanier
3rd Conference on the Intersections Between Particle and Nuclear Physics | 1988
K. Braune; S. Keh; L. Montanet; J. Zoll; R. Beckmann; J. Friedrich; H. Heinsius; T. Kiel; B. Lewendel; C. Pegel; U. Strohbusch; Philipp Blum; S. Cierjacks; D. Engelhardt; H. Koch; M. Kunze; H. Matthaey; W. Rohrbach; W. Schott; D. Walther; Ch. Weddigen; N. Winter; J. Bistirlich; R. Bossingham; H. Bossy; K.M. Crowe; A. Miller; D.V. Bugg; A.J. Sanjari; R.P. Haddock
\bar pp
Nuovo Cimento Della Societa Italiana Di Fisica A-nuclei Particles and Fields | 1994
C. Amsler; I. Augustin; C. A. Baker; B. M. Barnett; C. J. Batty; K. Beuchert; P. Birien; J. Bistirlich; Philipp Blum; R. Bossingham; H. Bossy; K. Braune; J. Brose; D.V. Bugg; Mark J. Burchell; T. Case; A. Cooper; K.M. Crowe; H.P. Dietz; S.v. Dombrowski; M. Doser; W. Dünnweber; D. Engelhardt; M. Englert; M. Faessler; C. Felix; G. Folger; R. Hackmann; R. P. Haddock; F.-H. Heinsius
Nuovo Cimento Della Societa Italiana Di Fisica A-nuclei Particles and Fields | 1994
C. Amsler; D.S. Armstrong; I. Augustin; C. A. Baker; B. M. Barnett; C. J. Batty; K. Beuchert; P. Birien; J. Bistirlich; Philipp Blum; R. Bossingham; H. Bossy; K. Braune; J. Brose; D.V. Bugg; Mark J. Burchell; T. Case; A. Cooper; K.M. Crowe; H.P. Dietz; S.v. Dombrowski; M. Doser; W. Dünnweber; D. Engelhardt; M. Englert; M. Faessler; C. Felix; G. Folger; R. Hackmann; R. P. Haddock
annihilation are possible for the first time with the Crystal Barrel detector at LEAR. The high-mass resolution for π0-mesons allows the reconstruction of KS0-mesons in their neutral-pion decay. Moreover, non-interacting KL0-mesons can be well identified by the measurement of missing energy. Annihilation into the channel KL0 KS0π0π0 proceeds predominantly via the following two-body intermediate states: K1(1400)K0, K1(1270)K0,
