Study of the angular distributions of the reactions p̄p→χc1, χc2→J/ψγ→e+e-γ

M. Ambrogiani; S. Bagnasco; W. Baldini; D. Bettoni; G. Borreani; A. Buzzo; R. Calabrese; R. Cester; P. Dalpiaz; X. Fan; G. Garzoglio; K. Gollwitzer; A. Hahn; S. Jin; J. Kasper; G. Lasio; M. LoVetere; E. Luppi; P. Maas; M. Macrì; M. Mandelkern; F. Marchetto; M. Marinelli; E. Menichetti; R. Mussa; M. Obertino; M. Pallavicini; N. Pastrone; C. Patrignani; T. Pedlar; S. Pordes; E. Robutti; J. Rosen; P. Rumerio; A. Santroni; M. Savrié; J. Schultz; K. K. Seth; G. Stancari; M. Stancari; J. Streets; A. Tomaradze; S. Werkema; G. Zioulas

doi:10.1103/PhysRevD.65.052002

Study of the angular distributions of the reactions p̄p→χ_c1, χ_c2→J/ψγ→e⁺e^-γ

M. Ambrogiani^*, S. Bagnasco, W. Baldini, D. Bettoni, G. Borreani, A. Buzzo, R. Calabrese, R. Cester, P. Dalpiaz, X. Fan, G. Garzoglio, K. Gollwitzer, A. Hahn, S. Jin, J. Kasper, G. Lasio, M. LoVetere, E. Luppi, P. Maas, M. MacrìM. Mandelkern, F. Marchetto, M. Marinelli, E. Menichetti, R. Mussa, M. Obertino, M. Pallavicini, N. Pastrone, C. Patrignani, T. Pedlar, S. Pordes, E. Robutti, J. Rosen, P. Rumerio, A. Santroni, M. Savrié, J. Schultz, K. K. Seth, G. Stancari, M. Stancari, J. Streets, A. Tomaradze, S. Werkema, G. Zioulas

^*Corresponding author for this work

Physics and Astronomy

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Abstract

We report on a study of the angular distributions in the radiative decay of the X_c1 and X_c2 states formed in p̄p annihilations. These distributions depend on the dynamics of the formation process and the multipole structure of the radiative decay. Using 2090 X_c1 and 5908 X_c2 events, we have measured the fractional magnetic quadrupole and amplitude to be a₂(X_c1)-M 2/E1 ≃ 0.002±0.032, a₂(X_c2) = -0.093_-0.041^+0.039. We have also measured the square of the helicity 0 fractional amplitude in the X_c2 formation process to be B₀² =0.13 ±0.08.

Original language	English (US)
Article number	052002
Pages (from-to)	520021-5200210
Number of pages	4680190
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	65
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.65.052002
State	Published - Mar 1 2002

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevD.65.052002

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Ambrogiani, M., Bagnasco, S., Baldini, W., Bettoni, D., Borreani, G., Buzzo, A., Calabrese, R., Cester, R., Dalpiaz, P., Fan, X., Garzoglio, G., Gollwitzer, K., Hahn, A., Jin, S., Kasper, J., Lasio, G., LoVetere, M., Luppi, E., Maas, P., ... Zioulas, G. (2002). Study of the angular distributions of the reactions p̄p→χ_c1, χ_c2→J/ψγ→e⁺e^-γ. Physical Review D - Particles, Fields, Gravitation and Cosmology, 65(5), 520021-5200210. Article 052002. https://doi.org/10.1103/PhysRevD.65.052002

@article{246d3c9cdb6743deb405ffcc9355172f,

title = "Study of the angular distributions of the reactions {\=p}p→χc1, χc2→J/ψγ→e+e-γ",

abstract = "We report on a study of the angular distributions in the radiative decay of the Xc1 and Xc2 states formed in {\=p}p annihilations. These distributions depend on the dynamics of the formation process and the multipole structure of the radiative decay. Using 2090 Xc1 and 5908 Xc2 events, we have measured the fractional magnetic quadrupole and amplitude to be a2(Xc1)-M 2/E1 ≃ 0.002±0.032, a2(Xc2) = -0.093-0.041+0.039. We have also measured the square of the helicity 0 fractional amplitude in the Xc2 formation process to be B02 =0.13 ±0.08.",

author = "M. Ambrogiani and S. Bagnasco and W. Baldini and D. Bettoni and G. Borreani and A. Buzzo and R. Calabrese and R. Cester and P. Dalpiaz and X. Fan and G. Garzoglio and K. Gollwitzer and A. Hahn and S. Jin and J. Kasper and G. Lasio and M. LoVetere and E. Luppi and P. Maas and M. Macr{\`i} and M. Mandelkern and F. Marchetto and M. Marinelli and E. Menichetti and R. Mussa and M. Obertino and M. Pallavicini and N. Pastrone and C. Patrignani and T. Pedlar and S. Pordes and E. Robutti and J. Rosen and P. Rumerio and A. Santroni and M. Savri{\'e} and J. Schultz and Seth, {K. K.} and G. Stancari and M. Stancari and J. Streets and A. Tomaradze and S. Werkema and G. Zioulas",

year = "2002",

month = mar,

day = "1",

doi = "10.1103/PhysRevD.65.052002",

language = "English (US)",

volume = "65",

pages = "520021--5200210",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

issn = "0556-2821",

publisher = "American Institute of Physics",

number = "5",

}

Ambrogiani, M, Bagnasco, S, Baldini, W, Bettoni, D, Borreani, G, Buzzo, A, Calabrese, R, Cester, R, Dalpiaz, P, Fan, X, Garzoglio, G, Gollwitzer, K, Hahn, A, Jin, S, Kasper, J, Lasio, G, LoVetere, M, Luppi, E, Maas, P, Macrì, M, Mandelkern, M, Marchetto, F, Marinelli, M, Menichetti, E, Mussa, R, Obertino, M, Pallavicini, M, Pastrone, N, Patrignani, C, Pedlar, T, Pordes, S, Robutti, E, Rosen, J, Rumerio, P, Santroni, A, Savrié, M, Schultz, J, Seth, KK, Stancari, G, Stancari, M, Streets, J, Tomaradze, A, Werkema, S & Zioulas, G 2002, 'Study of the angular distributions of the reactions p̄p→χ_c1, χ_c2→J/ψγ→e⁺e^-γ', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 65, no. 5, 052002, pp. 520021-5200210. https://doi.org/10.1103/PhysRevD.65.052002

TY - JOUR

T1 - Study of the angular distributions of the reactions p̄p→χc1, χc2→J/ψγ→e+e-γ

AU - Ambrogiani, M.

AU - Bagnasco, S.

AU - Baldini, W.

AU - Bettoni, D.

AU - Borreani, G.

AU - Buzzo, A.

AU - Calabrese, R.

AU - Cester, R.

AU - Dalpiaz, P.

AU - Fan, X.

AU - Garzoglio, G.

AU - Gollwitzer, K.

AU - Hahn, A.

AU - Jin, S.

AU - Kasper, J.

AU - Lasio, G.

AU - LoVetere, M.

AU - Luppi, E.

AU - Maas, P.

AU - Macrì, M.

AU - Mandelkern, M.

AU - Marchetto, F.

AU - Marinelli, M.

AU - Menichetti, E.

AU - Mussa, R.

AU - Obertino, M.

AU - Pallavicini, M.

AU - Pastrone, N.

AU - Patrignani, C.

AU - Pedlar, T.

AU - Pordes, S.

AU - Robutti, E.

AU - Rosen, J.

AU - Rumerio, P.

AU - Santroni, A.

AU - Savrié, M.

AU - Schultz, J.

AU - Seth, K. K.

AU - Stancari, G.

AU - Stancari, M.

AU - Streets, J.

AU - Tomaradze, A.

AU - Werkema, S.

AU - Zioulas, G.

PY - 2002/3/1

Y1 - 2002/3/1

N2 - We report on a study of the angular distributions in the radiative decay of the Xc1 and Xc2 states formed in p̄p annihilations. These distributions depend on the dynamics of the formation process and the multipole structure of the radiative decay. Using 2090 Xc1 and 5908 Xc2 events, we have measured the fractional magnetic quadrupole and amplitude to be a2(Xc1)-M 2/E1 ≃ 0.002±0.032, a2(Xc2) = -0.093-0.041+0.039. We have also measured the square of the helicity 0 fractional amplitude in the Xc2 formation process to be B02 =0.13 ±0.08.

AB - We report on a study of the angular distributions in the radiative decay of the Xc1 and Xc2 states formed in p̄p annihilations. These distributions depend on the dynamics of the formation process and the multipole structure of the radiative decay. Using 2090 Xc1 and 5908 Xc2 events, we have measured the fractional magnetic quadrupole and amplitude to be a2(Xc1)-M 2/E1 ≃ 0.002±0.032, a2(Xc2) = -0.093-0.041+0.039. We have also measured the square of the helicity 0 fractional amplitude in the Xc2 formation process to be B02 =0.13 ±0.08.

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UR - http://www.scopus.com/inward/citedby.url?scp=14244273164&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.65.052002

DO - 10.1103/PhysRevD.65.052002

M3 - Article

AN - SCOPUS:14244273164

SN - 0556-2821

VL - 65

SP - 520021

EP - 5200210

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 5

M1 - 052002

ER -

Study of the angular distributions of the reactions p̄p→χ_c1, χ_c2→J/ψγ→e⁺e^-γ

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