Phys. Rev. D 62, 032006 (2000) [4 pages]
Hadroproduction of the χ1 and χ2 states of charmonium in 800-GeV/c proton-silicon interactions
T. Alexopoulos et al. (E771 Collaboration)
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T. Alexopoulos18, L. Antoniazzi11, M. Arenton17, H. C. Ballagh1, H. Bingham1, A. Blankman12, M. Block10, A. Boden2, G. Bonomi11, Z. L. Cao17, T. Y. Chen9, K. Clark15, D. Cline2, S. Conetti17, M. Cooper16, G. Corti17, B. Cox17 *, P. Creti7, E. C. Dukes17, C. Durandet18, V. Elia7, A. R. Erwin18, L. Fortney4, V. Golovatyuk7, E. Gorini7, F. Grancagnolo7, K. Hagan17, M. Haire13, P. Hanlet17, M. He14, G. Introzzi11, M. Jenkins15, D. Judd13, W. Kononenko12, W. Kowald4, K. Lau6, A. Ledovskoy17, G. Liguori11, J. Lys1, P. O. Mazur5, A. P. McManus17, S. Misawa1, G. H. Mo6, C. T. Murphy5, K. Nelson17, V. Pogosyan17, S. Ramachandran2, J. Rhoades2, W. Selove12, R. P. Smith5, L. Spiegel5, J. G. Sun17, S. Tokar3, P. Torre11, J. Trischuk8, L. Turnbull13, D. E. Wagoner13, C. R. Wang14, C. Wei14, W. Yang5, N. Yao9, N. J. Zhang14, and B. T. Zou4 (E771 Collaboration)
1University of California at Berkeley, Berkeley, California 94720
2University of California at Los Angeles, Los Angeles, California 90024
3Comenius University, Bratislava, Slovakia
4Duke University, Durham, North Carolina 27706
5Fermi National Accelerator Laboratory, Batavia, Illinois 60510
6University of Houston, Houston, Texas 77204
7University and INFN of Lecce, I-73100 Lecce, Italy
8McGill University, Montreal, PQ Canada H3A 2T8
9Nanjing University, Nanjing, People’s Republic of China
10Northwestern University, Evanston, Illinois 60208
11University and INFN of Pavia, I-27100 Pavia, Italy
12University of Pennsylvania, Philadelphia, Pennsylvania 19104
13Prairie View A&M, Prairie View, Texas 77446
14Shandong University, Jinan, Shandong, People’s Republic of China
15University of South Alabama, Mobile, Alabama 36688
16Vanier College, St. Laurent, PQ Canada H4L 3X9
17University of Virginia, Charlottesville, Virginia 22901
18University of Wisconsin, Madison, Wisconsin 53706
Received 20 July 1999; published 11 July 2000
The cross sections for the hadroproduction of the χ1 and χ2 states of charmonium in proton-silicon collisions at sqrt[s]=38.8 GeV have been measured in Fermilab fixed target experiment 771. The χ states were observed via their radiative decay to J/ψγ, where the photon converted to e+e- in the material of the spectrometer. The estimated values for the χ1 and χ2 cross sections for xF>0 are 263±69(stat)±32(syst) and 498±143(stat)±67(syst) nb per nucleon, respectively. The resulting σ(χ1)/σ(χ2) ratio of 0.53±0.20(stat)±0.07(syst), although somewhat larger than most theoretical expectations, can be accommodated by the latest theoretical estimates.
©2000 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevD.62.032006
DOI: 10.1103/PhysRevD.62.032006
PACS: 13.85.Ni, 13.85.Qk, 14.40.Gx, 25.40.Ve
* Corresponding author. Electronic address: cox@uvahep.phys.virginia.edu
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