Search for QCD instanton-induced processes in deep-inelastic scattering at HERA

被引：25

作者：

Adloff, C ^{[1
]}

Andreev, V

Andrieu, B

Anthonis, T

Astvatsatourov, A

Babaev, A

Bähr, J

Baranov, P

Barrelet, E

Bartel, W

Becker, J

Beckingham, M

Beglarian, A

Behnke, O

Beier, C

Belousov, A

Berger, C

Berndt, T

Bizot, JC

Böhme, J

Boudry, V

Braunschweig, W

Brisson, V

Bröker, HB

Brown, DP

Bruncko, D

Büsser, FW

Bunyatyan, A

Burrage, A

Buschhorn, G

Bystritskaya, L

Campbell, AJ

Carli, T

Caron, S

Cassol-Brunner, F

Clarke, D

Collard, C

Contreras, JG

Coppens, YR

Coughlan, JA

Cousinou, MC

Cox, BE

Cozzika, G

Cvach, J

Dainton, JB

Dau, WD

Daum, K

Davidsson, M

Delcourt, B

Delerue, N

机构：

[1] Berg Univ Wuppertal, Fachbereich Phys, Wuppertal, Germany

[2] Rhein Westfal TH Aachen, Inst Phys 1, Aachen, Germany

[3] Rhein Westfal TH Aachen, Inst Phys 3, D-5100 Aachen, Germany

[4] Univ Birmingham, Sch Phys & Space Res, Birmingham B15 2TT, W Midlands, England

[5] Univ Antwerp, Antwerp, Belgium

[6] VUB, ULB, Inter Univ Inst High Energies, Brussels, Belgium

[7] Rutherford Appleton Lab, Chilton, Didcot, England

[8] Inst Nucl Phys, Krakow, Poland

[9] Univ Dortmund, Inst Phys, D-4600 Dortmund, Germany

[10] Joint Inst Nucl Res, Dubna, Russia

[11] CEA, DSM, CE Saclay, DAPNIA, Gif Sur Yvette, France

[12] DESY, D-2000 Hamburg, Germany

[13] Univ Hamburg, Inst Expt Phys, Hamburg, Germany

[14] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[15] Heidelberg Univ, Inst Phys, D-6900 Heidelberg, Germany

[16] Heidelberg Univ, Kirchhoff Inst Phys, Heidelberg, Germany

[17] Univ Kiel, Inst Expt & Angew Phys, Kiel, Germany

[18] Slovak Acad Sci, Inst Expt Phys, Kosice 04353, Slovakia

[19] Univ Lancaster, Sch Phys & Chem, Lancaster, England

[20] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England

[21] Queen Mary Univ London, London E1 4NS, England

[22] Lund Univ, Dept Phys, Lund, Sweden

[23] Univ Manchester, Dept Phys, Manchester M13 9PL, Lancs, England

[24] Univ Mediterranee, CNRS, IN2P3, CPPM, Marseille, France

[25] Inst Theoret & Expt Phys, Moscow 117259, Russia

[26] PN Lebedev Phys Inst, Moscow, Russia

[27] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[28] Univ Paris 11, IN2P3, CNRS, LAL, Orsay, France

[29] Ecole Polytech, IN2P3, LPNHE, CNRS, Palaiseau, France

[30] Univ Paris 06, IN2P3, CNRS, LPNHE, Paris, France

[31] Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic

[32] Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic

[33] Paul Scherrer Inst, Villigen, Switzerland

[34] Yerevan Phys Inst, Yerevan 375036, Armenia

[35] DESY, Zeuthen, Germany

[36] Swiss Fed Inst Technol, Inst Teilchenphys, Zurich, Switzerland

[37] Univ Zurich, Inst Phys, Zurich, Switzerland

[38] Natl Tech Univ Athens, Dept Phys, Athens 15773, Greece

[39] Berg Univ Wuppertal, Rechenzentrum, Wuppertal, Germany

[40] Univ Karlsruhe, Inst Expt Kernphys, D-7500 Karlsruhe, Germany

[41] CINVESTAV, Dept Fis Ap, Merida, Yucatan, Mexico

[42] Safarik Univ, Kosice, Slovakia

[43] CERN, Geneva, Switzerland

[44] CINVESTAV, Dept Fis, Mexico City, DF, Mexico

[45] Univ Roma Tre, Dipartimento Fis, Rome, Italy

[46] INFN Roma 3, Rome, Italy

[47] Berg Univ Wuppertal, Fachbereich Phys, Wuppertal, Germany

[48] Univ Paris 07, CNRS, IN2P3, LPNHE, Paris, France

来源：

EUROPEAN PHYSICAL JOURNAL C | 2002年 / 25卷 / 04期

关键词：

D O I：

10.1140/epjc/s2002-01039-8

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：

Signals of QCD instanton-induced processes are searched for in deep-inelastic scattering (DIS) at the electron-proton collider HERA in a kinematic region defined by the Bjorken-scaling variables x > 10(-3), 0.1 < y < 0.6 and photon virtualities 10 less than or similar to Q(2) < 100 GeV2. Several observables characterising hadronic final state properties of QCD instanton-induced events are exploited to identify a potentially instanton-enriched domain. While an excess of events with instanton-like topology is observed it cannot be claimed significant given the uncertainty of the standard DIS background simulation. Upper limits on the cross-section for instanton-induced processes of between 60 pb and 1000 pb are set dependent on the kinematic domain considered. The data do not exclude the cross-section predicted by instanton perturbation theory for small instanton sizes. At large instanton sizes a naive extrapolation of instanton perturbation theory yields a cross-section in the range of sensitivity of this study. Such a cross-section is not observed, in agreement with non-perturbative lattice simulations of the QCD vacuum.

引用

页码：495 / 509

页数：15

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