Measurement of the double-spin asymmetry A for inclusive multi-γ pair production with 200 GeV/c polarized proton beam and polarized proton target
| Autor: | T. Iijima, M. D. Corcoran, A. L. Read, D. Grosnick, T. Yoshida, N. Tanaka, A. N. Vasiliev, L. van Rossum, Kozo Miyake, S. B. Nurushev, D. L. Adams, Y. Goto, H M. Spinka, F. Nessi-Tedaldi, V. L. Solovyanov, M. Nessi, M. Laghai, Y. Itow, J. Cranshaw, S. Yamashita, VL Rykov, J. L. White, Akira Masaike, F. Takeutchi, A. A. Derevschikov, K. Krueger, J. Skeens, R. Takashima, G. Durand, P. Schiavon, J. B. Roberts, Fnal E, A. P. Meschanin, K. Iwatani, T. Nagamine, A. Michalowicz, T. Kasprzyk, Yu.A. Matulenko, A. Yokosawa, H. En'yo, G. Salvato, J. Deregel, H. Funahashi, K. Kuroda, G. Pauletta, A. Bravar, N. Tamura, N. I. Belikov, J. Fabre, J. D. Cossairt, N. Saito, O. A. Grachov, F. Luehring, P. Chaumette, J. Shepard, C. Nguyen, A. Penzo, Y. Ohashi, J. Bystricky, D. Lopiano, T. Maki, S. Makino, K. Fukuda, D. H. Miller, D. I. Patalakha, F. Lehar, A. de Lesquen, D. A. Hill, N. Akchurin, D. G. Underwood, K. Imai, A. Villari, Anna Zanetti, Yasar Onel |
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| Rok vydání: | 1994 |
| Předmět: |
Physics
Quark Nuclear and High Energy Physics Particle physics Meson media_common.quotation_subject Hadron Monte Carlo method Asymmetry Gluon Nuclear physics Pair production High Energy Physics::Experiment Nucleon LARGE TRANSVERSE-MOMENTUM DIRECT PHOTON PRODUCTION PI-0 PRODUCTION PP COLLISIONS 300 GEV/C DEPENDENCE SCATTERING NUCLEON HADRON PI+P media_common |
| Zdroj: | Physics letters. B 336 (1994): 269–274. doi:10.1016/0370-2693(94)00998-8 info:cnr-pdr/source/autori:ADAMS DL, AKCHURIN N, BELIKOV NI, BRAVAR A, BYSTRICKY J, CORCORAN MD, COSSAIRT JD, CRANSHAW J, DEREVSCHIKOV AA, ENYO H, FUNAHASHI H, GOTO Y, GRACHOV OA, GROSNICK DP, HILL DA, IIJIMA T, IMAI K, ITOW Y, IWATANI K, KRUEGER KW, KURODA K, LEHAR F, DELESQUEN A LOPIANO D, LUEHRING FC, MAKI T, MAKINO S, MASAIKE A, MATULENKO YA, MESCHANIN AP, MICHALOWICZ A, MILLER DH, MIYAKE K, NAGAMINE T, NESSITEDALDI F, NESSI M, NGUYEN C, NURUSHEV SB, OHASHI Y, ONEL Y, PATALAKHA DI, PAULETTA G, PENZO A, READ AL, ROBERTS JB, VANROSSUM L, RYKOV VL, SAITO N, SALVATO G, SCHIAVON P, SHIMA T, SKEENS J, SOLOVYANOV VL, SPINKA H, TAKASHIMA R, TAKEUTCHI F, TAMURA N, TANAKA N, UNDERWOOD DG, VASILIEV AN, VILLARI A, WHITE JL, YAMASHITA S, YOKOSAWA A, YOSHIDA T, ZANETTI A/titolo:MEASUREMENT OF THE DOUBLE-SPIN ASYMMETRY A(LL) FOR INCLUSIVE MULTI-GAMMA PAIR PRODUCTION WITH 200-GEV%2FC POLARIZED PROTON-BEAM AND POLARIZED PROTON TARGET/doi:10.1016%2F0370-2693(94)00998-8/rivista:Physics letters. B (Print)/anno:1994/pagina_da:269/pagina_a:274/intervallo_pagine:269–274/volume:336 |
| ISSN: | 0370-2693 |
| Popis: | The invariant double-differential cross section, E1E2d6 delta/dp(1)3dp(2)3, and the double-spin asymmetry, A(LL), for inclusive multi-gamma pair production in which gamma-rays came from neutral mesons were measured with a 200 GeV/c longitudinally-polarized proton beam and a longitudinally-polarized proton target. Most of the multi-gamma pairs comes from two-jet type events which are sensitive to partonic interaction. The A(LL) values were found to be consistent with zero. The invariant double-differential cross section for inclusive pi0pi0 production was also measured. These measured cross sections are consistent with LUND Monte Carlo simulations. Using the LUND Monte Carlo simulation package with the Carlitz-Kaur model of spin dependent distribution functions of valence quarks, the A(LL) values have been compared with theoretical predictions of gluon polarization, DELTAG/G. The results put restrictions on the size of DELTAG/G in the region of 0.05 less-than-or-similar-to x less-than-or-similar-to 0.35. |
| Databáze: | OpenAIRE |
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