Search for QCD instanton-induced processes at HERA in the high- $\pmb {Q^2}$ domain - INSPIRE

DataBETA

Search for QCD instanton-induced processes at HERA in the high- $\pmb {Q^2}$ domain

H1

Collaboration

•

Vladimir Andreev
(
- Lebedev Inst.
)

Mar 17, 2016

24 pages

Published in:

Eur.Phys.J.C 76 (2016) 7, 381

Published: Jul 7, 2016

e-Print:

1603.05567 [hep-ex]

DOI:

10.1140/epjc/s10052-016-4194-6

Report number:

DESY-16-050

Experiments:

DESY-HERA-H1

View in:

reference search13 citations

Citations per year

Abstract: (Springer)

Signals of QCD instanton-induced processes are searched for in neutral current deep-inelastic scattering at the electron-proton collider HERA in the kinematic region defined by the Bjorken-scaling variable

x > 10^{-3}

, the inelasticity

0.2< y < 0.7

and the photon virtuality

150< Q^2 < 15000

GeV

^2

. The search is performed using H1 data corresponding to an integrated luminosity of 351 pb

^{-1}

. No evidence for the production of QCD instanton-induced events is observed. Upper limits on the cross section for instanton-induced processes between 1.5 and 6 pb, at

95\,\,\%

confidence level, are obtained depending on the kinematic domain in which instantons could be produced. Compared to earlier publications, the limits are improved by an order of magnitude and for the first time are challenging predictions.

Note:

23 pages, 9 figures, this version accepted by EPJC

deep inelastic scattering: neutral current
electron p: scattering
final state: hadronic
quantum chromodynamics
experimental methods
experimental results
DESY HERA Stor
kinematics
instanton
photon

References(71)

Figures(9)

[1]

Pseudoparticle Solutions of the Yang-Mills Equations

A.A. Belavin
(
- Landau Inst.
)
,
Alexander M. Polyakov
(
- Landau Inst.
)
,
A.S. Schwartz
(
- Landau Inst.
)
,
Yu.S. Tyupkin
(
- Landau Inst.
)

- Phys.Lett.B 59 (1975) 85-87,
- Also in *Rebbi, C. (ed.), Soliani, G. (ed.): Solitons and Particles*, 739-741, and in *Mohapatra, R. N. ( Ed.), Lai, C. H. ( Ed.): Gauge Theories Of Fundamental Interactions*, 371-373,
•
DOI:
- 10.1016/0370-2693(75)90163-X

[2]

Symmetry Breaking Through Bell-Jackiw Anomalies

Gerard 't Hooft
(
- Harvard U.
)

- Phys.Rev.Lett. 37 (1976) 8-11,
•
DOI:
- 10.1103/PhysRevLett.37.8

[2]

Computation of the Quantum Effects Due to a Four-Dimensional Pseudoparticle

Gerard 't Hooft
(
- Harvard U.
)

- Phys.Rev.D 14 (1976) 3432-3450,
- Phys.Rev.D 18 (1978) 2199 (erratum),
•
DOI:
- 10.1103/PhysRevD.14.3432

[2]

Computation of the Quantum Effects Due to a Four-Dimensional Pseudoparticle

Gerard 't Hooft
(
- Harvard U.
)

- Phys.Rev.D 14 (1976) 3432-3450,
- Phys.Rev.D 18 (1978) 2199 (erratum),
•
DOI:
- 10.1103/PhysRevD.14.3432

[3]

Towards the phenomenology of QCD instanton induced particle production at HERA

A. Ringwald
(
- DESY
)
,
F. Schrempp
(
- DESY
)

- ,
- In *Vladimir 1994, Proceedings, Quarks '94* 170-193, and Hamburg DESY - DESY-94-197 (94,rec.Nov.) 32 p
•
e-Print:
- hep-ph/9411217

[4]

Instanton induced contributions to structure functions of deep inelastic scattering

- Phys.Lett.B 314 (1993) 237-245
•
e-Print:
- hep-ph/9305269
•
DOI:
- 10.1016/0370-2693(93)90455-Q

[5]

Instantons in deep inelastic scattering: The Simplest process

- Nucl.Phys.B 507 (1997) 134-156
•
e-Print:
- hep-ph/9609445
•
DOI:
- 10.1016/S0550-3213(97)00592-0

[6]

Instanton induced cross-sections in deep inelastic scattering

A. Ringwald
(
- DESY
)
,
F. Schrempp
(
- DESY
)

- Phys.Lett.B 438 (1998) 217-228
•
e-Print:
- hep-ph/9806528
•
DOI:
- 10.1016/S0370-2693(98)00953-8

[7]

Confronting instanton perturbation theory with QCD lattice results

A. Ringwald
(
- DESY
)
,
F. Schrempp
(
- DESY
)

- Phys.Lett.B 459 (1999) 249-258
•
e-Print:
- hep-lat/9903039
•
DOI:
- 10.1016/S0370-2693(99)00682-6

[8]

(Hamburg, Germany,), G. Ingelman A. deRoeck, and R. Klanner (eds.) vol. 1, p. 509

M. Gibbs

[9]

QCD instanton induced processes in deep inelastic scattering: Search strategies and model dependencies

T. Carli
(
- Munich, Max Planck Inst.
)
,
J. Gerigk
(
- Munich, Max Planck Inst.
)
,
A. Ringwald
(
- DESY
)
,
F. Schrempp
(
- DESY
)

- ,
- In *Hamburg 1998/1999, Monte Carlo generators for HERA physics* 329-347
•
e-Print:
- hep-ph/9906441

[10]

Zooming in on instantons at HERA

A. Ringwald
(
- DESY
)
,
F. Schrempp
(
- DESY
)

- Phys.Lett.B 503 (2001) 331-340
•
e-Print:
- hep-ph/0012241
•
DOI:
- 10.1016/S0370-2693(01)00216-7

[11]

QCDINS 2.0: A Monte Carlo generator for instanton induced processes in deep inelastic scattering

A. Ringwald
(
- DESY
)
,
F. Schrempp
(
- DESY
)

- Comput.Phys.Commun. 132 (2000) 267-305
•
e-Print:
- hep-ph/9911516
•
DOI:
- 10.1016/S0010-4655(00)00148-X

[12]

Theory and phenomenology of instantons at HERA

A. Ringwald
(
- DESY
)
,
F. Schrempp
(
- DESY
)

- Lect.Notes Phys. 546 (2000) 203,
•
e-Print:
- hep-ph/9909338

[13]

Tracking QCD instantons

F. Schrempp
(
- DESY
)

- J.Phys.G 28 (2002) 915-926
•
e-Print:
- hep-ph/0109032
•
DOI:
- 10.1088/0954-3899/28/5/316

[14]

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

H1

Collaboration

•

C. Adloff

et al.

- Eur.Phys.J.C 25 (2002) 495-509
•
e-Print:
- hep-ex/0205078
•
DOI:
- 10.1140/epjc/s2002-01039-8

[15]

Search for QCD instanton induced events in deep inelastic ep scattering at HERA

ZEUS

Collaboration

•

S. Chekanov
(
- Argonne
)

et al.

- Eur.Phys.J.C 34 (2004) 255-265
•
e-Print:
- hep-ex/0312048
•
DOI:
- 10.1140/epjc/s2004-01735-3

[16]

private communication, December

F. Schrempp

[17]

The Effect of Instantons on the Short Distance Structure of Hadronic Currents

- Phys.Rev.D 18 (1978) 468
•
DOI:
- 10.1103/PhysRevD.18.468

[18]

Review of Lattice Results Concerning Low-Energy Particle Physics

Sinya Aoki
(
- Kyoto U., Yukawa Inst., Kyoto
)
,
Yasumichi Aoki
(
- KMI, Nagoya and
- RIKEN BNL
)
,
Claude Bernard
(
- Washington U., St. Louis
)
,
Tom Blum
(
- Connecticut U. and
- RIKEN BNL
)
,
Gilberto Colangelo
(
- U. Bern, AEC and
- Bern U.
)

et al.

- Eur.Phys.J.C 74 (2014) 2890
•
e-Print:
- 1310.8555
•
DOI:
- 10.1140/epjc/s10052-014-2890-7

[19]

The H1 detector at HERA

H1

Collaboration

•

I. Abt

et al.

- Nucl.Instrum.Meth.A 386 (1997) 310-347
•
DOI:
- 10.1016/S0168-9002(96)00893-5

[20]

The Tracking, calorimeter and muon detectors of the H1 experiment at HERA

H1

Collaboration

•

I. Abt

et al.

- Nucl.Instrum.Meth.A 386 (1997) 348-396
•
DOI:
- 10.1016/S0168-9002(96)00894-7

[21]

The H1 liquid argon calorimeter system

et al.

- Nucl.Instrum.Meth.A 336 (1993) 460-498
•
DOI:
- 10.1016/0168-9002(93)91257-N

[22]

The H1 lead / scintillating fiber calorimeter

et al.

- Nucl.Instrum.Meth.A 386 (1997) 397-408
•
DOI:
- 10.1016/S0168-9002(96)01171-0

[23]

Results from pion calibration runs for the H1 liquid argon calorimeter and comparisons with simulations

B. Andrieu
(
- Paris U., VI-VII
)
,
J. Bán
(
- Kosice, IEF
)
,
E. Barrelet
(
- Paris U., VI-VII
)
,
H. Bergstein
(
- Aachen, Tech. Hochsch.
)
,
G. Bernardi
(
- Paris U., VI-VII
)

et al.

- Nucl.Instrum.Meth.A 336 (1993) 499-509
•
DOI:
- 10.1016/0168-9002(93)91258-O

1-25 of 71
1
2
3
25 / page