Results of a search for the hc(P11) state of charmonium in the ηcγ and J/ψπ0 decay modes

M. Andreotti; S. Bagnasco; W. Baldini; D. Bettoni; G. Borreani; A. Buzzo; R. Calabrese; R. Cester; G. Cibinetto; P. Dalpiaz; G. Garzoglio; K. E. Gollwitzer; M. Graham; M. Hu; D. Joffe; J. Kasper; G. Lasio; M. Lo Vetere; E. Luppi; M. Macrì; M. Mandelkern; F. Marchetto; M. Marinelli; E. Menichetti; Z. Metreveli; R. Mussa; M. Negrini; M. M. Obertino; M. Pallavicini; N. Pastrone; C. Patrignani; T. K. Pedlar; S. Pordes; E. Robutti; W. Roethel; J. L. Rosen; P. Rumerio; R. Rusack; A. Santroni; J. Schultz; S. H. Seo; K. K. Seth; G. Stancari; M. Stancari; A. Tomaradze; I. Uman; T. Vidnovic; S. Werkema; P. Zweber

doi:10.1103/PhysRevD.72.032001

Results of a search for the hc(P11) state of charmonium in the ηcγ and J/ψπ0 decay modes

M. Andreotti, S. Bagnasco, W. Baldini, D. Bettoni, G. Borreani, A. Buzzo, R. Calabrese, R. Cester, G. Cibinetto, P. Dalpiaz, G. Garzoglio, K. E. Gollwitzer, M. Graham, M. Hu, D. Joffe, J. Kasper, G. Lasio, M. Lo Vetere, E. Luppi, M. MacrìM. Mandelkern, F. Marchetto, M. Marinelli, E. Menichetti, Z. Metreveli, R. Mussa, M. Negrini, M. M. Obertino, M. Pallavicini, N. Pastrone, C. Patrignani, T. K. Pedlar, S. Pordes, E. Robutti, W. Roethel, J. L. Rosen, P. Rumerio, R. Rusack, A. Santroni, J. Schultz, S. H. Seo, K. K. Seth, G. Stancari, M. Stancari, A. Tomaradze, I. Uman, T. Vidnovic, S. Werkema, P. Zweber

Physics and Astronomy (Twin Cities)

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Abstract

We report evidence for the hc state of charmonium in its ηcγ decay mode and lack of evidence in the J/ψπ0 mode. We studied these channels in p̄p annihilations near the center of gravity of the PJ3 states, where the hc was reported in the J/ψπ0 mode by E760, our previous experiment, at 3526.2±0.15±0.2MeV, with ΓR≤1MeV. We observe an event excess in the ηcγ mode near 3526 MeV. Testing the null hypothesis of a linearly varying background cross section against the alternate hypothesis that includes a resonance near 3526 MeV, we reject the null hypothesis with P∼0.001. The resonance mass is 3525.8±0.2±0. 2MeV and the resonance width ≤1MeV. We estimate 10.0±3. 5<Γp̄pBηcγ<12.0±4.5eV, corresponding to fixed values 0.5<ΓR<1.0MeV. We find no event excess within the search region in the J/ψπ0 mode.

Original language	English (US)
Article number	032001
Pages (from-to)	1-11
Number of pages	11
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	72
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevD.72.032001
State	Published - Aug 1 2005

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10.1103/PhysRevD.72.032001

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Andreotti, M., Bagnasco, S., Baldini, W., Bettoni, D., Borreani, G., Buzzo, A., Calabrese, R., Cester, R., Cibinetto, G., Dalpiaz, P., Garzoglio, G., Gollwitzer, K. E., Graham, M., Hu, M., Joffe, D., Kasper, J., Lasio, G., Lo Vetere, M., Luppi, E., ... Zweber, P. (2005). Results of a search for the hc(P11) state of charmonium in the ηcγ and J/ψπ0 decay modes. Physical Review D - Particles, Fields, Gravitation and Cosmology, 72(3), 1-11. Article 032001. https://doi.org/10.1103/PhysRevD.72.032001

Andreotti, M, Bagnasco, S, Baldini, W, Bettoni, D, Borreani, G, Buzzo, A, Calabrese, R, Cester, R, Cibinetto, G, Dalpiaz, P, Garzoglio, G, Gollwitzer, KE, Graham, M, Hu, M, Joffe, D, Kasper, J, Lasio, G, Lo Vetere, M, Luppi, E, Macrì, M, Mandelkern, M, Marchetto, F, Marinelli, M, Menichetti, E, Metreveli, Z, Mussa, R, Negrini, M, Obertino, MM, Pallavicini, M, Pastrone, N, Patrignani, C, Pedlar, TK, Pordes, S, Robutti, E, Roethel, W, Rosen, JL, Rumerio, P, Rusack, R, Santroni, A, Schultz, J, Seo, SH, Seth, KK, Stancari, G, Stancari, M, Tomaradze, A, Uman, I, Vidnovic, T, Werkema, S & Zweber, P 2005, 'Results of a search for the hc(P11) state of charmonium in the ηcγ and J/ψπ0 decay modes', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 72, no. 3, 032001, pp. 1-11. https://doi.org/10.1103/PhysRevD.72.032001

@article{ab9993a65b3c4b6790f5717b12a42d02,

title = "Results of a search for the hc(P11) state of charmonium in the ηcγ and J/ψπ0 decay modes",

abstract = "We report evidence for the hc state of charmonium in its ηcγ decay mode and lack of evidence in the J/ψπ0 mode. We studied these channels in {\=p}p annihilations near the center of gravity of the PJ3 states, where the hc was reported in the J/ψπ0 mode by E760, our previous experiment, at 3526.2±0.15±0.2MeV, with ΓR≤1MeV. We observe an event excess in the ηcγ mode near 3526 MeV. Testing the null hypothesis of a linearly varying background cross section against the alternate hypothesis that includes a resonance near 3526 MeV, we reject the null hypothesis with P∼0.001. The resonance mass is 3525.8±0.2±0. 2MeV and the resonance width ≤1MeV. We estimate 10.0±3. 5<Γ{\=p}pBηcγ<12.0±4.5eV, corresponding to fixed values 0.5<ΓR<1.0MeV. We find no event excess within the search region in the J/ψπ0 mode.",

author = "M. Andreotti and S. Bagnasco and W. Baldini and D. Bettoni and G. Borreani and A. Buzzo and R. Calabrese and R. Cester and G. Cibinetto and P. Dalpiaz and G. Garzoglio and Gollwitzer, {K. E.} and M. Graham and M. Hu and D. Joffe and J. Kasper and G. Lasio and {Lo Vetere}, M. and E. Luppi and M. Macr{\`i} and M. Mandelkern and F. Marchetto and M. Marinelli and E. Menichetti and Z. Metreveli and R. Mussa and M. Negrini and Obertino, {M. M.} and M. Pallavicini and N. Pastrone and C. Patrignani and Pedlar, {T. K.} and S. Pordes and E. Robutti and W. Roethel and Rosen, {J. L.} and P. Rumerio and R. Rusack and A. Santroni and J. Schultz and Seo, {S. H.} and Seth, {K. K.} and G. Stancari and M. Stancari and A. Tomaradze and I. Uman and T. Vidnovic and S. Werkema and P. Zweber",

year = "2005",

month = aug,

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doi = "10.1103/PhysRevD.72.032001",

language = "English (US)",

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T1 - Results of a search for the hc(P11) state of charmonium in the ηcγ and J/ψπ0 decay modes

AU - Andreotti, M.

AU - Bagnasco, S.

AU - Baldini, W.

AU - Bettoni, D.

AU - Borreani, G.

AU - Buzzo, A.

AU - Calabrese, R.

AU - Cester, R.

AU - Cibinetto, G.

AU - Dalpiaz, P.

AU - Garzoglio, G.

AU - Gollwitzer, K. E.

AU - Graham, M.

AU - Hu, M.

AU - Joffe, D.

AU - Kasper, J.

AU - Lasio, G.

AU - Lo Vetere, M.

AU - Luppi, E.

AU - Macrì, M.

AU - Mandelkern, M.

AU - Marchetto, F.

AU - Marinelli, M.

AU - Menichetti, E.

AU - Metreveli, Z.

AU - Mussa, R.

AU - Negrini, M.

AU - Obertino, M. M.

AU - Pallavicini, M.

AU - Pastrone, N.

AU - Patrignani, C.

AU - Pedlar, T. K.

AU - Pordes, S.

AU - Robutti, E.

AU - Roethel, W.

AU - Rosen, J. L.

AU - Rumerio, P.

AU - Rusack, R.

AU - Santroni, A.

AU - Schultz, J.

AU - Seo, S. H.

AU - Seth, K. K.

AU - Stancari, G.

AU - Stancari, M.

AU - Tomaradze, A.

AU - Uman, I.

AU - Vidnovic, T.

AU - Werkema, S.

AU - Zweber, P.

PY - 2005/8/1

Y1 - 2005/8/1

N2 - We report evidence for the hc state of charmonium in its ηcγ decay mode and lack of evidence in the J/ψπ0 mode. We studied these channels in p̄p annihilations near the center of gravity of the PJ3 states, where the hc was reported in the J/ψπ0 mode by E760, our previous experiment, at 3526.2±0.15±0.2MeV, with ΓR≤1MeV. We observe an event excess in the ηcγ mode near 3526 MeV. Testing the null hypothesis of a linearly varying background cross section against the alternate hypothesis that includes a resonance near 3526 MeV, we reject the null hypothesis with P∼0.001. The resonance mass is 3525.8±0.2±0. 2MeV and the resonance width ≤1MeV. We estimate 10.0±3. 5<Γp̄pBηcγ<12.0±4.5eV, corresponding to fixed values 0.5<ΓR<1.0MeV. We find no event excess within the search region in the J/ψπ0 mode.

AB - We report evidence for the hc state of charmonium in its ηcγ decay mode and lack of evidence in the J/ψπ0 mode. We studied these channels in p̄p annihilations near the center of gravity of the PJ3 states, where the hc was reported in the J/ψπ0 mode by E760, our previous experiment, at 3526.2±0.15±0.2MeV, with ΓR≤1MeV. We observe an event excess in the ηcγ mode near 3526 MeV. Testing the null hypothesis of a linearly varying background cross section against the alternate hypothesis that includes a resonance near 3526 MeV, we reject the null hypothesis with P∼0.001. The resonance mass is 3525.8±0.2±0. 2MeV and the resonance width ≤1MeV. We estimate 10.0±3. 5<Γp̄pBηcγ<12.0±4.5eV, corresponding to fixed values 0.5<ΓR<1.0MeV. We find no event excess within the search region in the J/ψπ0 mode.

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

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

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ER -

Results of a search for the hc(P11) state of charmonium in the ηcγ and J/ψπ0 decay modes

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