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Underlying event characteristics and their dependence on jet size of charged-particle jet events in pp collisions at √(s) = 7 TeV with the ATLAS detector

Aad, G. and Perez, K. (2012) Underlying event characteristics and their dependence on jet size of charged-particle jet events in pp collisions at √(s) = 7 TeV with the ATLAS detector. Physical Review D, 86 (7). Art. No. 072004. ISSN 2470-0010. https://resolver.caltech.edu/CaltechAUTHORS:20121112-095523780

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Abstract

Distributions sensitive to the underlying event are studied in events containing one or more charged-particle jets produced in pp collisions at √s=7  TeV with the ATLAS detector at the Large Hadron Collider (LHC). These measurements reflect 800  μb^(-1) of data taken during 2010. Jets are reconstructed using the anti-kt algorithm with radius parameter R varying between 0.2 and 1.0. Distributions of the charged-particle multiplicity, the scalar sum of the transverse momentum of charged particles, and the average charged-particle p_T are measured as functions of p_T^(jet) in regions transverse to and opposite the leading jet for 4  GeV<p_T^(jet)<100  GeV. In addition, the R dependence of the mean values of these observables is studied. In the transverse region, both the multiplicity and the scalar sum of the transverse momentum at fixed p_T^(jet) vary significantly with R, while the average charged-particle transverse momentum has a minimal dependence on R. Predictions from several Monte Carlo tunes have been compared to the data; the predictions from Pythia 6, based on tunes that have been determined using LHC data, show reasonable agreement with the data, including the dependence on R. Comparisons with other generators indicate that additional tuning of soft-QCD parameters is necessary for these generators. The measurements presented here provide a testing ground for further development of the Monte Carlo models.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevD.86.072004DOIUNSPECIFIED
http://link.aps.org/doi/10.1103/PhysRevD.86.072004PublisherUNSPECIFIED
http://prd.aps.org/abstract/PRD/v86/i7/e072004PublisherUNSPECIFIED
Additional Information:© 2012 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Received 2 August 2012; published 9 October 2012. We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC, and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST, and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR, and VSC CR, Czech Republic; DNRF, DNSRC, and Lundbeck Foundation, Denmark; EPLANET and ERC, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNAS, Georgia; BMBF, DFG, HGF, MPG, and AvH Foundation, Germany; GSRT, Greece; ISF, MINERVA, GIF, DIP, and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW, Poland; GRICES and FCT, Portugal; MERYS (MECTS), Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MVZT, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF, and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular, from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CCIN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA) and in the Tier-2 facilities worldwide.
Funders:
Funding AgencyGrant Number
ANPCyT (Argentina)UNSPECIFIED
YerPhl (Armenia)UNSPECIFIED
ARC (Australia)UNSPECIFIED
BMWF (Austria)UNSPECIFIED
ANAS (Azerbaijan)UNSPECIFIED
SSTC (Belarus)UNSPECIFIED
CNPq and FAPESP (Brazil)UNSPECIFIED
NSERC (Canada)UNSPECIFIED
NRC (Canada)UNSPECIFIED
CFI (Canada)UNSPECIFIED
CERNUNSPECIFIED
CONICYT (Chile)UNSPECIFIED
CASUNSPECIFIED
MoST (China)UNSPECIFIED
NSFC (China)UNSPECIFIED
COLCIENCIAS (Colombia)UNSPECIFIED
MSMT CR (Czech Republic)UNSPECIFIED
MPO CR and VSC CR (Czech Republic)UNSPECIFIED
DNRF (Denmark)UNSPECIFIED
DNSRC and Lundbeck Foundation (Denmark)UNSPECIFIED
EPLANET and ERCUNSPECIFIED
European UnionUNSPECIFIED
IN2P3-CNRS (France)UNSPECIFIED
CEA-DSM/IRFU (France)UNSPECIFIED
GNAS (Georgia)UNSPECIFIED
BMBF (Germany)UNSPECIFIED
DFG (Germany)UNSPECIFIED
HGF (Germany)UNSPECIFIED
MPG (Germany)UNSPECIFIED
AvH Foundation (Germany)UNSPECIFIED
GSRT (Greece)UNSPECIFIED
ISF (Israel)UNSPECIFIED
MINERVA (Israel)UNSPECIFIED
GIF (Israel)UNSPECIFIED
DIP and Benoziyo Center (Israel)UNSPECIFIED
INFN (Italy)UNSPECIFIED
MEXT and JSPS (Japan)UNSPECIFIED
CNRST (Morocco)UNSPECIFIED
FOM and NWO (The Netherlands)UNSPECIFIED
RCN (Norway)UNSPECIFIED
MNiSW (Poland)UNSPECIFIED
GRICES and FCT (Portugal)UNSPECIFIED
MERYS (MECTS) (Romania)UNSPECIFIED
MES of Russia and ROSATOMUNSPECIFIED
Russian FederationUNSPECIFIED
JINRUNSPECIFIED
MSTD (Serbia)UNSPECIFIED
MSSR (Slovakia)UNSPECIFIED
ARRS and MVZT (Slovenia)UNSPECIFIED
DST/NRF (South Africa)UNSPECIFIED
MICINN (Spain)UNSPECIFIED
SRC and Wallenberg Foundation (Sweden)UNSPECIFIED
SER (Switzerland)UNSPECIFIED
SNSF and Cantons of Bern in Geneva (Switzerland)UNSPECIFIED
NSC (Taiwan)UNSPECIFIED
TAEK (Turkey)UNSPECIFIED
STFC (United Kingdom)UNSPECIFIED
Royal Society and Leverhulme Trust (United Kingdom)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
Issue or Number:7
Classification Code: PACS: 13.85.Hd, 13.87.-a
Record Number:CaltechAUTHORS:20121112-095523780
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20121112-095523780
Official Citation:Underlying event characteristics and their dependence on jet size of charged-particle jet events in pp collisions at √(s)=7  TeV with the ATLAS detector G. Aad et al. (ATLAS Collaboration) Published 9 October 2012 (34 pages) 072004
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35406
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Nov 2012 16:03
Last Modified:03 Oct 2019 04:28

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