Abstract
For comparison of inclusive jet cross sections measured at hadron-hadron colliders to next-to-leading order (NLO) parton-level calculations, the energy deposited in the jet cone by spectator parton interactions must first be subtracted. The assumption made at the Tevatron is that the spectator parton interaction energy is similar to the ambient level measured in minimum bias events. In this paper, we test this assumption by measuring the ambient charged track momentum in events containing large transverse energy jets at [Formula Presented] and [Formula Presented] and comparing this ambient momentum with that observed both in minimum bias events and with that predicted by two Monte Carlo models. Two cones in [Formula Presented] space are defined, at the same pseudorapidity, [Formula Presented], as the jet with the highest transverse energy ([Formula Presented]), and at [Formula Presented] in the azimuthal direction, [Formula Presented]. The total charged track momentum inside each of the two cones is measured. The minimum momentum in the two cones is almost independent of [Formula Presented] and is similar to the momentum observed in minimum bias events, whereas the maximum momentum increases roughly linearly with the jet [Formula Presented] over most of the measured range. This study was carried out using data from the CDF detector taken during Run 1 (1994-1995). The study will help improve the precision of comparisons of jet cross section data and NLO perturbative QCD predictions. The distribution of the sum of the track momenta in the two cones is also examined for five different [Formula Presented] bins. The HERWIG and PYTHIA Monte Carlo generators are reasonably successful in describing the data, but neither can describe completely all of the event properties.
| Original language | English |
|---|---|
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 70 |
| Issue number | 7 |
| DOIs | |
| State | Published - 2004 |
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Underlying event in hard interactions at the Fermilab Tevatron [Formula Presented] collider. / Acosta, D.; Affolder, T.; Albrow, M. G. et al.
In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 70, No. 7, 2004.Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Underlying event in hard interactions at the Fermilab Tevatron [Formula Presented] collider
AU - Acosta, D.
AU - Affolder, T.
AU - Albrow, M. G.
AU - Ambrose, D.
AU - Amidei, D.
AU - Anikeev, K.
AU - Antos, J.
AU - Apollinari, G.
AU - Arisawa, T.
AU - Artikov, A.
AU - Ashmanskas, W.
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AU - Barnes, V. E.
AU - Barnett, B. A.
AU - Baroiant, S.
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N1 - Funding Information: We thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work was supported by the U.S. Department of Energy and National Science Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the Ministry of Education, Culture, Sports, Science and Technology of Japan; the Natural Sciences and Engineering Research Council of Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A. P. Sloan Foundation; the Bundes?>ministerium fuer Bildung und Forschung, Germany; the Korean Science and Engineering Foundation and the Korean Research Foundation; the Particle Physics and Astronomy Research Council and the Royal Society, UK; the Russian Foundation for Basic Research; the Comision Interministerial de Ciencia y Tecnologia, Spain; in part by the European Community’s Human Potential Programme under Contract No. HPRN-CT-20002, Probe for New Physics; and by the Research Fund of Istanbul University Project No. 1755/21122001.
PY - 2004
Y1 - 2004
N2 - For comparison of inclusive jet cross sections measured at hadron-hadron colliders to next-to-leading order (NLO) parton-level calculations, the energy deposited in the jet cone by spectator parton interactions must first be subtracted. The assumption made at the Tevatron is that the spectator parton interaction energy is similar to the ambient level measured in minimum bias events. In this paper, we test this assumption by measuring the ambient charged track momentum in events containing large transverse energy jets at [Formula Presented] and [Formula Presented] and comparing this ambient momentum with that observed both in minimum bias events and with that predicted by two Monte Carlo models. Two cones in [Formula Presented] space are defined, at the same pseudorapidity, [Formula Presented], as the jet with the highest transverse energy ([Formula Presented]), and at [Formula Presented] in the azimuthal direction, [Formula Presented]. The total charged track momentum inside each of the two cones is measured. The minimum momentum in the two cones is almost independent of [Formula Presented] and is similar to the momentum observed in minimum bias events, whereas the maximum momentum increases roughly linearly with the jet [Formula Presented] over most of the measured range. This study was carried out using data from the CDF detector taken during Run 1 (1994-1995). The study will help improve the precision of comparisons of jet cross section data and NLO perturbative QCD predictions. The distribution of the sum of the track momenta in the two cones is also examined for five different [Formula Presented] bins. The HERWIG and PYTHIA Monte Carlo generators are reasonably successful in describing the data, but neither can describe completely all of the event properties.
AB - For comparison of inclusive jet cross sections measured at hadron-hadron colliders to next-to-leading order (NLO) parton-level calculations, the energy deposited in the jet cone by spectator parton interactions must first be subtracted. The assumption made at the Tevatron is that the spectator parton interaction energy is similar to the ambient level measured in minimum bias events. In this paper, we test this assumption by measuring the ambient charged track momentum in events containing large transverse energy jets at [Formula Presented] and [Formula Presented] and comparing this ambient momentum with that observed both in minimum bias events and with that predicted by two Monte Carlo models. Two cones in [Formula Presented] space are defined, at the same pseudorapidity, [Formula Presented], as the jet with the highest transverse energy ([Formula Presented]), and at [Formula Presented] in the azimuthal direction, [Formula Presented]. The total charged track momentum inside each of the two cones is measured. The minimum momentum in the two cones is almost independent of [Formula Presented] and is similar to the momentum observed in minimum bias events, whereas the maximum momentum increases roughly linearly with the jet [Formula Presented] over most of the measured range. This study was carried out using data from the CDF detector taken during Run 1 (1994-1995). The study will help improve the precision of comparisons of jet cross section data and NLO perturbative QCD predictions. The distribution of the sum of the track momenta in the two cones is also examined for five different [Formula Presented] bins. The HERWIG and PYTHIA Monte Carlo generators are reasonably successful in describing the data, but neither can describe completely all of the event properties.
UR - http://www.scopus.com/inward/record.url?scp=80051551406&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.70.072002
DO - 10.1103/PhysRevD.70.072002
M3 - Article
AN - SCOPUS:80051551406
VL - 70
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 0556-2821
IS - 7
ER -