Probing Color Coherence Effects in pp Collisions at $\sqrt{s}=7\,\text {TeV} $

A study of color coherence effects in pp collisions at a center-of-mass energy of 7 TeV is presented. The data used in the analysis were collected in 2010 with the CMS detector at the LHC and correspond to an integrated luminosity of 36 inverse picobarns. Events are selected that contain at least three jets and where the two jets with the largest transverse momentum exhibit a back-to-back topology. The measured angular correlation between the second- and third-leading jet is shown to be sensitive to color coherence effects, and is compared to the predictions of Monte Carlo models with various implementations of color coherence. None of the models describe the data satisfactorily.

Note:

Replaced with published version. Added journal reference and DOI

color: coherence
coherence: effect
p p: scattering
dijet: angular correlation
jet: transverse momentum
CERN LHC Coll
Monte Carlo
CMS
jet: multiple production
rapidity dependence

References(38)

Figures(6)

[1]

Test of Fragmentation Models by Comparison with Three Jet Events Produced in e+ e- ---> Hadrons

JADE

Collaboration

•

W. Bartel
(
- DESY
)

et al.

- Phys.Lett.B 134 (1984) 275,
- Phys. Lett. B134 (1984) 275-280 and Hamburg Desy - DESY 83-079 (83,REC.AUG.) 13p
•
DOI:
- 10.1016/0370-2693(84)90687-7

[2]

Comparison of the particle flow in $q\bar{q}g$ and $q\bar{q}\gamma$ events in $e^+e^-$ annihilation

TPC/Two Gamma

Collaboration

•

H. Aihara

et al.

- Phys.Rev.Lett. 57 (1986) 945
•
DOI:
- 10.1103/PhysRevLett.57.945

[3]

A Study of Three Jet Events in e+ e- Annihilation Into Hadrons at 34.6-GeV Center-Of-Mass Energy

TASSO

Collaboration

•

M. Althoff
(
- Aachen, Tech. Hochsch.
)

et al.

- Z.Phys.C 29 (1985) 29,
- Z. Phys. C29 ( 1985) 29-40 and Hamburg Desy - DESY 85-063 (85,REC.AUG.) 40p
•
DOI:
- 10.1007/BF01571375

[4]

A Comparison of the Particle Flow in Three Jet and Radiative Two Jet Events From $e^+ e^-$ Annihilation at $e$ ({CM}) = 29-{GeV}

et al.

- Phys.Rev.Lett. 57 (1986) 1398
•
DOI:
- 10.1103/PhysRevLett.57.1398

[5]

A Study of coherence of soft gluons in hadron jets

OPAL

Collaboration

•

M.Z. Akrawy
(
- Queen Mary, U. of London
)

et al.

- Phys.Lett.B 247 (1990) 617-628,
- Phys. Lett. B247 (1990) 617-628 and CERN Geneva - CERN-EP 90-094 (90,rec.Nov.) 20 p
•
DOI:
- 10.1016/0370-2693(90)91911-T

[6]

Evidence for gluon interference in hadronic Z decays

L3

Collaboration

•

M. Acciarri

et al.

- Phys.Lett.B 353 (1995) 145-154
•
DOI:
- 10.1016/0370-2693(95)00552-V

[7]

Evidence for color coherence in $p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV

CDF

Collaboration

•

F. Abe

et al.

- Phys.Rev.D 50 (1994) 5562-5579
•
DOI:
- 10.1103/PhysRevD.50.5562

[8]

Color coherent radiation in multijet events from $p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV

D0

Collaboration

•

B. Abbott

et al.

- Phys.Lett.B 414 (1997) 419-427
•
e-Print:
- hep-ex/9706012
•
DOI:
- 10.1016/S0370-2693(97)01190-8

[9]

Monte Carlo Simulation of General Hard Processes with Coherent QCD Radiation

G. Marchesini
(
- Parma U. and
- INFN, Parma
)
,
B.R. Webber
(
- Cambridge U.
)

- Nucl.Phys.B 310 (1988) 461-526
•
DOI:
- 10.1016/0550-3213(88)90089-2

[10]

The CMS Experiment at the CERN LHC

CMS

Collaboration

•

S. Chatrchyan
(
- Yerevan Phys. Inst.
)

et al.

- JINST 3 (2008) S08004
•
DOI:
- 10.1088/1748-0221/3/08/S08004

[11]

The anti- $k_t$ jet clustering algorithm

- JHEP 04 (2008) 063
•
e-Print:
- 0802.1189
•
DOI:
- 10.1088/1126-6708/2008/04/063

[12]

FastJet User Manual

Matteo Cacciari
(
- Paris, LPTHE and
- Diderot U., Paris
)
,
Gavin P. Salam
(
- CERN and
- Princeton U. and
- Paris, LPTHE
)
,
Gregory Soyez
(
- Saclay, SPhT
)

- Eur.Phys.J.C 72 (2012) 1896
•
e-Print:
- 1111.6097
•
DOI:
- 10.1140/epjc/s10052-012-1896-2

[13]

Particle-Flow Event Reconstruction in CMS and Performance for Jets, Taus, and MET

CMS

Collaboration

[14]

Jet Energy Corrections determination at 7 TeV

CMS

Collaboration

[15]

Jet Energy Resolution in CMS at sqrt(s)=7 TeV

CMS

Collaboration

[16]

Pileup subtraction using jet areas

Matteo Cacciari
(
- Paris, LPTHE
)
,
Gavin P. Salam
(
- Paris, LPTHE
)

- Phys.Lett.B 659 (2008) 119-126
•
e-Print:
- 0707.1378
•
DOI:
- 10.1016/j.physletb.2007.09.077

[17]

Tracking and Primary Vertex Results in First 7 TeV Collisions

CMS

Collaboration

[18]

Calorimeter Jet Quality Criteria for the First CMS Collision Data

CMS

Collaboration

[19]

PYTHIA 6.4 Physics and Manual

Torbjorn Sjostrand
(
- Lund U., Dept. Theor. Phys.
)
,
Stephen Mrenna
(
- Fermilab
)
,
Peter Z. Skands
(
- Fermilab
)

- JHEP 05 (2006) 026
•
e-Print:
- hep-ph/0603175
•
DOI:
- 10.1088/1126-6708/2006/05/026

[20]

Spin Correlations in Parton - Parton Scattering

I.G. Knowles
(
- UC, Santa Barbara and
- Cambridge U.
)

- Nucl.Phys.B 310 (1988) 571-588
•
DOI:
- 10.1016/0550-3213(88)90092-2

[21]

A Linear Algorithm for Calculating Spin Correlations in Hadronic Collisions

I.G. Knowles
(
- Santa Barbara, KITP and
- Cambridge U.
)

- Comput.Phys.Commun. 58 (1990) 271-284,
- Comput. Phys. Commun. 58 (1990) 271-284 and Calif. Univ. Santa Barbara - NSF-ITP-88-078 (88,rec.Jul.) 22 p. (812691)
•
DOI:
- 10.1016/0010-4655(90)90063-7

[22]

Early LHC Underlying Event Data - Findings and Surprises

Rick Field
(
- Florida U.
)

e-Print:
- 1010.3558

[23]

New generation of parton distributions with uncertainties from global QCD analysis

J. Pumplin
(
- Michigan State U.
)
,
D.R. Stump
(
- Michigan State U.
)
,
J. Huston
(
- Michigan State U.
)
,
H.L. Lai
(
- Michigan State U.
)
,
Pavel M. Nadolsky
(
- Michigan State U.
)

et al.

- JHEP 07 (2002) 012
•
e-Print:
- hep-ph/0201195
•
DOI:
- 10.1088/1126-6708/2002/07/012

[24]

Parton Fragmentation and String Dynamics

- Phys.Rept. 97 (1983) 31-145
•
DOI:
- 10.1016/0370-1573(83)90080-7

[25]

The Merging of Jets

Torbjorn Sjostrand
(
- DESY
)

- Phys.Lett.B 142 (1984) 420-424,
- Phys. Lett. B142 (1984) 420-424 and Hamburg Desy - DESY 84-019 (84,REC.FEB.) 14p
•
DOI:
- 10.1016/0370-2693(84)91354-6

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