Measurement of the diffractive cross section in deep inelastic scattering using ZEUS 1994 data

被引:226
作者
Breitweg, J [1 ]
Derrick, M
Krakauer, D
Magill, S
Mikunas, D
Musgrave, B
Repond, J
Stanek, R
Talaga, RL
Yoshida, R
Zhang, H
Mattingly, MCK
Anselmo, F
Antonioli, P
Bari, G
Basile, M
Bellagamba, L
Boscherini, D
Bruni, A
Bruni, G
Romeo, GC
Castellini, G
Cifarelli, L
Cindolo, F
Contin, A
Coppola, N
Corradi, M
De Pasquale, S
Giusti, P
Iacobucci, G
Laurenti, G
Levi, G
Margotti, A
Massam, T
Nania, R
Palmonari, F
Pesci, A
Polini, A
Sartorelli, G
Garcia, YZ
Zichichi, A
Amelung, C
Bornheim, A
Brock, I
Coboken, K
Crittenden, J
Deffner, R
Eckert, M
Grothe, M
Hartmann, H
机构
[1] Argonne Natl Lab, Argonne, IL 60439 USA
[2] Andrews Univ, Berrien Springs, MI 49104 USA
[3] Univ Bologna, Bologna, Italy
[4] Ist Nazl Fis Nucl, I-40126 Bologna, Italy
[5] Univ Bonn, Inst Phys, D-5300 Bonn, Germany
[6] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England
[7] Univ Calabria, Dept Phys, I-87036 Cosenza, Italy
[8] Ist Nazl Fis Nucl, Cosenza, Italy
[9] Chonnam Natl Univ, Kwangju, South Korea
[10] Columbia Univ, Nevis Labs, Irvington, NY USA
[11] Inst Phys Nucl, Krakow, Poland
[12] Acad Min & Met, Fac Phys & Nucl Techniques, Krakow, Poland
[13] Jagiellonian Univ, Dept Phys, Krakow, Poland
[14] DESY, D-2000 Hamburg, Germany
[15] DESY, IFH, Zeuthen, Germany
[16] Univ Florence, Florence, Italy
[17] Ist Nazl Fis Nucl, I-50125 Florence, Italy
[18] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[19] Univ Freiburg, Fak Phys, D-7800 Freiburg, Germany
[20] Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland
[21] Univ Hamburg, Inst Exp Phys 1, Hamburg, Germany
[22] Univ Hamburg, Inst Expt Phys 2, D-2000 Hamburg, Germany
[23] Univ London Imperial Coll Sci Technol & Med, High Energy Nucl Phys Grp, London, England
[24] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
[25] Forschungszentrum Julich, Inst Kernphys, D-5170 Julich, Germany
[26] KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki, Japan
[27] Korea Univ, Seoul 136701, South Korea
[28] Kyungpook Natl Univ, Taegu 702701, South Korea
[29] Univ Autonoma Madrid, Dept Fis Teor, Madrid, Spain
[30] McGill Univ, Dept Phys, Montreal, PQ, Canada
[31] Meiji Gakuin Univ, Fac Gen Educ, Yokohama, Kanagawa, Japan
[32] Moscow Phys Engn Inst, Moscow, Russia
[33] Moscow MV Lomonosov State Univ, Inst Phys Nucl, Moscow, Russia
[34] Univ Amsterdam, Amsterdam, Netherlands
[35] NIKHEF H, NL-1009 DB Amsterdam, Netherlands
[36] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA
[37] Univ Oxford, Dept Phys, Oxford OX1 2JD, England
[38] Ist Nazl Fis Nucl, Padua, Italy
[39] Univ Padua, Dipartimento Fis, Padua, Italy
[40] Penn State Univ, Dept Phys, University Pk, PA 16802 USA
[41] Polytech Univ, Sagamihara, Kanagawa, Japan
[42] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[43] Ist Nazl Fis Nucl, Rome, Italy
[44] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England
[45] Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA
[46] Tel Aviv Univ, Sch Phys, Raymond & Beverly Sackler Fac Exact Sci, IL-69978 Tel Aviv, Israel
[47] Univ Tokyo, Dept Phys, Tokyo 113, Japan
[48] Tokyo Metropolitan Univ, Dept Phys, Tokyo, Japan
[49] Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy
[50] Ist Nazl Fis Nucl, I-10125 Turin, Italy
来源
EUROPEAN PHYSICAL JOURNAL C | 1999年 / 6卷 / 01期
关键词
D O I
10.1007/s100520050321
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
The DIS diffractive cross section, d sigma(gamma*p-->XN)(diff)/dM(X), has been measured in the mass range M-X < 15 GeV for gamma*p c.m. energies 60 < W < 200 GeV and photon virtualities Q(2) = 7 to 140 GeV2. For fixed Q(2) and M-X, the diffractive cross section rises rapidly with W, d sigma(gamma*p-->XN)(diff) (M-X, W, Q(2))/dM(X) proportional to W-adiff with a(diff) = 0.507 +/- 0.034(stat)(-0.046)(+0.155) (syst) corresponding to a t-averaged pomeron trajectory of <(alpha)over bar>(P) = 1.127 +/- 0.009(stat)(-0.012)(+0.039) (syst) which is larger than <(alpha)over bar>(P) observed in hadron-hadron scattering The W dependence of the diffractive cross section is found to be the same as that of the total cross section for scattering of virtual photons on protons. The data are consistent with the assumption that the diffractive structure function F-2(D(3)) factorizes according to x(P)F(2)(D(3))(x(p), beta, Q(2)) = (x(0)/x(P))F-n(2)D(2) (beta, Q(2)). They are also consistent with QCD based models which incorporate factorization breaking. The rise of x(P)F(2)(D(3)) with decreasing x(P) and the weak dependence of F-2(D(2)) On Q(2) suggest a substantial contribution from partonic interactions.
引用
收藏
页码:43 / 66
页数:24
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