Measurement of dijet production in neutral current deep inelastic scattering at high Q**2 and determination of alpha(s)

Dijet production has been studied in neutral current deep inelastic e+p scattering for 470 < Q**2 < 20000 GeV**2 with the ZEUS detector at HERA using an integrated luminosity of 38.4 pb**{-1}. Dijet differential cross sections are presented in a kinematic region where both theoretical and experimental uncertainties are small. Next-to-leading-order (NLO) QCD calculations describe the measured differential cross sections well. A QCD analysis of the measured dijet fraction as a function of Q**2 allows both a precise determination of alpha_s(M_Z) and a test of the energy-scale dependence of the strong coupling constant. A detailed analysis provides an improved estimate of the uncertainties of the NLO QCD cross sections arising from the parton distribution functions of the proton. The value of alpha_s(M_Z), as determined from the QCD fit, is alpha_s(M_Z) = 0.1166 +- 0.0019 (stat.) {+ 0.0024}_{-0.0033} (exp.)} {+ 0.0057}_{- 0.0044} (th.).

Note:

32 pages including 5 figures and 23 tables. Final version to appear in PLB

positron p: colliding beams
positron p: deep inelastic scattering
neutral current
jet: pair production
yield: (2jet)
differential cross section
transverse momentum dependence
quantum chromodynamics: perturbation theory
p: structure function
momentum spectrum: parton

References(55)

Figures(6)

Measurement of alpha-s from jet rates in deep inelastic scattering at HERA

ZEUS

Collaboration

•

M. Derrick
(
- Argonne, PHY
)

et al.

- Phys.Lett.B 363 (1995) 201-216
•
e-Print:
- hep-ex/9510001
•
DOI:
- 10.1016/0370-2693(95)01284-W

Deep inelastic e p scattering in perturbation theory

V.N. Gribov
(
- St. Petersburg, INP
)
,
L.N. Lipatov
(
- St. Petersburg, INP
)

- Sov.J.Nucl.Phys. 15 (1972) 438-450,
- Yad.Fiz. 15 (1972) 781-807

The parton model and perturbation theory

L.N. Lipatov
(
- St. Petersburg, INP
)

- Sov.J.Nucl.Phys. 20 (1975) 94-102,
- Yad.Fiz. 20 (1974) 181-198

Calculation of the Structure Functions for Deep Inelastic Scattering and e+ e- Annihilation by Perturbation Theory in Quantum Chromodynamics.

Yuri L. Dokshitzer
(
- St. Petersburg, INP
)

- Sov.Phys.JETP 46 (1977) 641-653,
- Zh.Eksp.Teor.Fiz. 73 (1977) 1216-1240

Asymptotic Freedom in Parton Language

- Nucl.Phys.B 126 (1977) 298-318
•
DOI:
- 10.1016/0550-3213(77)90384-4

The One Jet Inclusive Cross-Section at Order alpha-s**3. 1. Gluons Only

Stephen D. Ellis
(
- Washington U., Seattle
)
,
Zoltan Kunszt
(
- Zurich, ETH
)
,
Davison E. Soper
(
- Oregon U.
)

- Phys.Rev.D 40 (1989) 2188-2222,
•
DOI:
- 10.1103/PhysRevD.40.2188

Two jet production in hadron collisions at order alpha-s**3 in QCD

Stephen D. Ellis
(
- Washington U., Seattle
)
,
Zoltan Kunszt
(
- Zurich, ETH
)
,
Davison E. Soper
(
- Oregon U.
)

- Phys.Rev.Lett. 69 (1992) 1496-1499
•
DOI:
- 10.1103/PhysRevLett.69.1496

Calculation of jet cross-sections in hadron collisions at order alpha-s**3

Zoltan Kunszt
(
- Zurich, ETH
)
,
Davison E. Soper
(
- Oregon U.
)

- Phys.Rev.D 46 (1992) 192-221
•
DOI:
- 10.1103/PhysRevD.46.192

Higher order corrections to jet cross-sections in e+ e- annihilation

W.T. Giele
(
- Fermilab
)
,
E.W.Nigel Glover
(
- Fermilab
)

- Phys.Rev.D 46 (1992) 1980-2010
•
DOI:
- 10.1103/PhysRevD.46.1980

Higher order corrections to jet cross-sections in hadron colliders

W.T. Giele
(
- Fermilab
)
,
E.W.Nigel Glover
(
- Durham U.
)
,
David A. Kosower
(
- CERN and
- Saclay
)

- Nucl.Phys.B 403 (1993) 633-670
•
e-Print:
- hep-ph/9302225
•
DOI:
- 10.1016/0550-3213(93)90365-V

Three jet cross-sections to next-to-leading order

- Nucl.Phys.B 467 (1996) 399-442
•
e-Print:
- hep-ph/9512328
•
DOI:
- 10.1016/0550-3213(96)00110-1

Calculation of QCD jet cross-sections at next-to-leading order

- Nucl.Phys.B 486 (1997) 189-226
•
e-Print:
- hep-ph/9610498
•
DOI:
- 10.1016/S0550-3213(96)00657-8

A General algorithm for calculating jet cross-sections in NLO QCD

S. Catani
(
- Florence U. and
- INFN, Florence
)
,
M.H. Seymour
(
- CERN
)

- Nucl.Phys.B 485 (1997) 291-419,
- Nucl.Phys.B 510 (1998) 503-504 (erratum)
•
e-Print:
- hep-ph/9605323
•
DOI:
- 10.1016/S0550-3213(96)00589-5

Dijet production at HERA in next-to-leading order

- Phys.Lett.B 380 (1996) 205-212
•
e-Print:
- hep-ph/9511448
•
DOI:
- 10.1016/0370-2693(96)00426-1

Theory of jets in deep inelastic scattering

Erwin Mirkes
(
- Karlsruhe U., TTP
)

e-Print:
- hep-ph/9711224

Disaster++: Version 1.0

Dirk Graudenz
(
- PSI, Villigen
)

e-Print:
- hep-ph/9710244

JetViP 1.1: Calculating one- and two-jet cross sections with virtual photons in NLO QCD

B. Pötter
(
- Hamburg U.
)

- Comput.Phys.Commun. 119 (1999) 45-66
•
e-Print:
- hep-ph/9806437
•
DOI:
- 10.1016/S0010-4655(99)00190-3

Design and construction of the ZEUS barrel calorimeter.

et al.

- Nucl.Instrum.Meth.A 309 (1991) 77-100
•
DOI:
- 10.1016/0168-9002(91)90094-7

Construction and beam test of the ZEUS forward and rear calorimeter

ZEUS

Collaboration

•

A. Andresen
(
- Hamburg U., Inst. Theor. Phys. II
)

et al.

- Nucl.Instrum.Meth.A 309 (1991) 101-142
•
DOI:
- 10.1016/0168-9002(91)90095-8

Design and implementation of a high precision readout system for the ZEUS calorimeter

A. Caldwell
(
- Nevis Labs, Columbia U.
)
,
I. Gialas
(
- Nevis Labs, Columbia U.
)
,
S. Mishra
(
- Nevis Labs, Columbia U.
)
,
J. Parsons
(
- Nevis Labs, Columbia U.
)
,
S. Ritz
(
- Nevis Labs, Columbia U.
)

et al.

- Nucl.Instrum.Meth.A 321 (1992) 356-364
•
DOI:
- 10.1016/0168-9002(92)90413-X

Beam tests of the ZEUS barrel calorimeter

et al.

- Nucl.Instrum.Meth.A 336 (1993) 23-52
•
DOI:
- 10.1016/0168-9002(93)91078-2

Vertex Triggering Using Time Difference Measurements in the ZEUS Central Tracking Detector

N. Harnew
(
- Bristol U. and
- Oxford U. and
- Rutherford
)
,
G.P. Heath
(
- Bristol U. and
- Oxford U. and
- Rutherford
)
,
M.D. Jeffs
(
- Bristol U. and
- Oxford U. and
- Rutherford
)
,
J. Nash
(
- Bristol U. and
- Oxford U. and
- Rutherford
)
,
G. Salmon
(
- Bristol U. and
- Oxford U. and
- Rutherford
)

et al.

- Nucl.Instrum.Meth.A 279 (1989) 290-296
•
DOI:
- 10.1016/0168-9002(89)91096-6

The Performance of the Zeus central tracking detector z-by-timing electronics in a transputer based data acquisition system

et al.

- Nucl.Phys.B Proc.Suppl. 32 (1993) 181-188,
- In *Como 1992, Proceedings, Advanced technology and particle physics* 181-188,
- Nucl. Phys. B, Proc. Suppl. 32 (1993) 181-188) and Oxford Univ. - OUNP-92-14 (92,rec.Oct.) 8 p
•
DOI:
- 10.1016/0920-5632(93)90023-Y

The Design and construction of the ZEUS central tracking detector

ZEUS

Collaboration

•

B. Foster
(
- Bristol U.
)

et al.

- Nucl.Instrum.Meth.A 338 (1994) 254-283
•
DOI:
- 10.1016/0168-9002(94)91313-7

Measurement of total and partial photon proton cross-sections at 180-GeV center-of-mass energy

ZEUS

Collaboration

•

M. Derrick
(
- Argonne, PHY
)

et al.

- Z.Phys.C 63 (1994) 391-408
•
DOI:
- 10.1007/BF01580320

1-25 of 55
1
2
3
25 / page