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Featured researches published by nan Church.
Nuclear Physics | 1991
T. A. Armstrong; M. Masuzawa; Nadia Pastrone; S. Palestini; A. Hahn; M. Dameri; D. Dimitroyannis; L. Tecchio; Church; M. Fabbri; P. A. Rapidis; William L. Marsh; A. M. Majewska; J. Schultz; C. Patrignani; L. Pesando; P. Dalpiaz; Cristina Biino; G. Borreani; F. Marchetto; J. Zhao; R. Mussa; J. Marques; G. Rinaudo; E. Menichetti; M. Marinelli; M. Martini; A. Migliori; Hasan; M. F. Weber
We report on a study of the χ1(3P1) and χ2(3P2) states of charmonium formed in antiproton-proton annihilations. An energy scan through the resonances, performed with a very narrow momentum-band beam of antiprotons intersecting a hydrogen jet target, enables us to perform very precise measurements of the mass and the total width of the two resonances. From a sample of 513 χ1 and 585 χ2 events we find Mχ1 = (3510.53±0.13) MeV/c2, Mχ2 = (3556.15±0.14) MeV/c2, Γχ1 = (0.88±0.14) MeV and Γχ2 = (1.98±0.18) MeV. From our measurement of the quantity Γ(R → pp) × BR(R → Jψ → e+ e−), using known branching ratios, we obtain Λ(χ1 → pp) = (69±13) eV and Λ(χ2 → pp) = (180±31) eV.
Physical Review D | 1993
T. A. Armstrong; D. Bettoni; Bharadwaj; Cristina Biino; G. Borreani; D. Broemmelsiek; A. Buzzo; R. Calabrese; A. Ceccucci; R. Cester; Church; Pietro Dalpiaz; P. Dalpiaz; R. Dibenedetto; D. Dimitroyannis; M. Fabbri; J. Fast; A. Gianoli; C. M. Ginsburg; K. Gollwitzer; Aa Hahn; M. Hasan; S. Hsueh; R. Lewis; E. Luppi; M. Macri; A. M. Majewska; Ma Mandelkern; F. Marchetto; M. Marinelli
We report on a study of the angular distribution in the reaction [ital [bar p]p][r arrow][chi][sub [ital c]2][r arrow][ital J]/[psi][gamma][r arrow][ital e][sup +][ital e[minus]][gamma]. Using a sample of 1904 events, we find that the contribution of helicity zero in the formation process is [ital B][sub 0][sup 2][lt]0.22 (90% C.L.), and that the normalized quadrupole amplitude in the radiative decay is [ital a][sub 2]=[minus]0.14[plus minus]0.06. The normalized radiative decay octupole amplitude [ital a][sub 3] is found to be consistent with zero.
Physical Review D | 1993
T. A. Armstrong; D. Bettoni; V. Bharadwaj; Cristina Biino; G. Borreani; D. Broemmelsiek; A. Buzzo; R. Calabrese; A. Ceccucci; R. Cester; Church; P. Dalpiaz; Pietro Dalpiaz; R. Dibenedetto; D. Dimitroyannis; M. Fabbri; J. Fast; A. Gianoli; C. M. Ginsburg; K. Gollwitzer; A. Hahn; Hasan; S. Hsueh; R. Lewis; E. Luppi; M. Macri; A. M. Majewska; Mandelkern; F. Marchetto; M. Marinelli
We report on a study of the angular distribution in the reaction [ital [bar p]p][r arrow][chi][sub [ital c]2][r arrow][ital J]/[psi][gamma][r arrow][ital e][sup +][ital e[minus]][gamma]. Using a sample of 1904 events, we find that the contribution of helicity zero in the formation process is [ital B][sub 0][sup 2][lt]0.22 (90% C.L.), and that the normalized quadrupole amplitude in the radiative decay is [ital a][sub 2]=[minus]0.14[plus minus]0.06. The normalized radiative decay octupole amplitude [ital a][sub 3] is found to be consistent with zero.
Physical Review Letters | 1992
T. A. Armstrong; A. Scalisi; M. Masuzawa; Nadia Pastrone; S. Palestini; A. Hahn; D. Dimitroyannis; A. Smith; Church; K. Gollwitzer; M. Pallavicini; W. Marsh; A. M. Majewska; J. Schultz; M. Sozzi; C. Patrignani; L. Pesando; P. Dalpiaz; Cristina Biino; G. Borreani; J. Zhao; R. Mussa; J. Marques; G. Rinaudo; E. Menichetti; M. Marinelli; M. Martini; A. Migliori; M. Fabbri; M. F. Weber
Physical Review D | 1993
T. A. Armstrong; D. Bettoni; Bharadwaj; Cristina Biino; G. Borreani; D. Broemmelsiek; A. Buzzo; R. Calabrese; A. Ceccucci; R. Cester; Church; P. Dalpiaz; Pietro Dalpiaz; R. Dibenedetto; D. Dimitroyannis; M. Fabbri; J. Fast; A. Gianoli; C. M. Ginsburg; K. Gollwitzer; A. Hahn; M. Hasan; S. Hsueh; R. Lewis; E. Luppi; M. Macri; A. M. Majewska; M. Mandelkern; F. Marchetto; M. Marinelli
Physical Review D | 1993
T. A. Armstrong; D. Bettoni; Bharadwaj; Cristina Biino; G. Borreani; D. Broemmelsiek; A. Buzzo; R. Calabrese; A. Ceccucci; R. Cester; Church; P. Dalpiaz; Pietro Dalpiaz; R. Dibenedetto; D. Dimitroyannis; M. Fabbri; J. Fast; A. Gianoli; C. M. Ginsburg; K. Gollwitzer; A. Hahn; M. Hasan; S. Hsueh; R. Lewis; E. Luppi; M. Macri; A. M. Majewska; M. Mandelkern; F. Marchetto; M. Marinelli
Physical Review D | 1992
T. A. Armstrong; A. Scalisi; M. Masuzawa; Nadia Pastrone; S. Palestini; A. Hahn; W. Marsh; D. Dimitroyannis; L. Tecchio; A. Smith; Church; M. Fabbri; M. Pallavicini; J. Peoples; M. Sozzi; C. Patrignani; D. Broemmelsiek; P. Dalpiaz; Cristina Biino; G. Borreani; M. Zito; J. Zhao; R. Mussa; J. Marques; G. Rinaudo; M. Marinelli; M. Martini; E. Menichetti; Hasan; L. Pesando
Physical Review Letters | 1993
T. A. Armstrong; D. Bettoni; Bharadwaj; Cristina Biino; G. Borreani; D. Broemmelsiek; A. Buzzo; R. Calabrese; A. Ceccucci; R. Cester; Church; Pietro Dalpiaz; P. Dalpiaz; R. Dibenedetto; D. Dimitroyannis; M. Fabbri; J. Fast; A. Gianoli; C. M. Ginsburg; K. Gollwitzer; Aa Hahn; M. Hasan; S. Hsueh; R. Lewis; E. Luppi; M. Macri; A. M. Majewska; Ma Mandelkern; F. Marchetto; M. Marinelli
Physical Review D | 1993
T. A. Armstrong; D. Bettoni; Bharadwaj; Cristina Biino; G. Borreani; D. Broemmelsiek; A. Buzzo; R. Calabrese; A. Ceccucci; R. Cester; Church; Pietro Dalpiaz; P. Dalpiaz; R. Dibenedetto; D. Dimitroyannis; M. Fabbri; J. Fast; A. Gianoli; C. M. Ginsburg; K. Gollwitzer; Aa Hahn; M. Hasan; S. Hsueh; R. Lewis; E. Luppi; M. Macri; A. M. Majewska; Ma Mandelkern; F. Marchetto; M. Marinelli
Physical Review D | 1993
T. A. Armstrong; D. Bettoni; V. Bharadwaj; Cristina Biino; G. Borreani; D. Broemmelsiek; A. Buzzo; R. Calabrese; A. Ceccucci; R. Cester; Church; P. Dalpiaz; Pietro Dalpiaz; R. Dibenedetto; D. Dimitroyannis; M. Fabbri; J. Fast; A. Gianoli; C. M. Ginsburg; K. Gollwitzer; A. Hahn; Hasan; S. Hsueh; R. Lewis; E. Luppi; M. Macri; A. M. Majewska; Mandelkern; F. Marchetto; M. Marinelli
