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Title: Simultaneous measurements of the t t ¯ , W + W - , and Z / γ * τ τ production cross-sections in p p collisions at s = 7 TeV with the ATLAS detector

Abstract

Simultaneous measurements of the tt¯, W +W , and Z/γ*→ττ production cross-sections using an integrated luminosity of 4.6 fb –1 of pp collisions at √s=7 TeV collected by the ATLAS detector at the LHC are presented. Events are selected with two high transverse momentum leptons consisting of an oppositely charged electron and muon pair. The three processes are separated using the distributions of the missing transverse momentum of events with zero and greater than zero jet multiplicities. Measurements of the fiducial cross-section are presented along with results that quantify for the first time the underlying correlations in the predicted and measured cross-sections due to proton parton distribution functions. Results indicate that the correlated next-to-leading-order predictions for tt¯ and Z/γ*→ττ underestimate the data, while those at next-to-next-to-leading-order generally describe the data well. The full cross-sections are measured to be σ(tt¯)=181.2 ± 2.8 +9.7 –9.5 ± 3.3 ± 3.3 pb, σ(W +W ) = 53.3 ± 2.7 +7.3 –8.0 ± 1.0 ± 0.5 pb, and σ(Z/γ*→ττ) = 1174 ± 24 +72 –87 ± 21 ± 9 pb, where the cited uncertainties are due to statistics, systematic effects, luminosity and the LHC beam energy measurement, respectively. The W +W measurement includes themore » small contribution from Higgs boson decays, H → W +W .« less

Authors:
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  1. et. al.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
ATLAS Collaboration
OSTI Identifier:
1181293
Alternate Identifier(s):
OSTI ID: 1224553; OSTI ID: 1224689; OSTI ID: 1407332
Grant/Contract Number:  
SC00112704; AC03-76SF00515; AC02-06CH11357; AC02-05CH11231
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 91; Journal Issue: 5; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Aad, G., Aad, G., Abbott, B., Abdallah, J., Khalek, S. Abdel, Abdinov, O., Aben, R., Abi, B., Abolins, M., AbouZeid, O. S., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adamczyk, L., Adams, D. L., Adelman, J., Adomeit, S., and Adye, T. Simultaneous measurements of the tt¯ , W+W- , and Z/γ*→ττ production cross-sections in pp collisions at s=7 TeV with the ATLAS detector. United States: N. p., 2015. Web. doi:10.1103/PhysRevD.91.052005.
Aad, G., Aad, G., Abbott, B., Abdallah, J., Khalek, S. Abdel, Abdinov, O., Aben, R., Abi, B., Abolins, M., AbouZeid, O. S., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adamczyk, L., Adams, D. L., Adelman, J., Adomeit, S., & Adye, T. Simultaneous measurements of the tt¯ , W+W- , and Z/γ*→ττ production cross-sections in pp collisions at s=7 TeV with the ATLAS detector. United States. doi:10.1103/PhysRevD.91.052005.
Aad, G., Aad, G., Abbott, B., Abdallah, J., Khalek, S. Abdel, Abdinov, O., Aben, R., Abi, B., Abolins, M., AbouZeid, O. S., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adamczyk, L., Adams, D. L., Adelman, J., Adomeit, S., and Adye, T. Fri . "Simultaneous measurements of the tt¯ , W+W- , and Z/γ*→ττ production cross-sections in pp collisions at s=7 TeV with the ATLAS detector". United States. doi:10.1103/PhysRevD.91.052005.
@article{osti_1181293,
title = {Simultaneous measurements of the tt¯ , W+W- , and Z/γ*→ττ production cross-sections in pp collisions at s=7 TeV with the ATLAS detector},
author = {Aad, G. and Aad, G. and Abbott, B. and Abdallah, J. and Khalek, S. Abdel and Abdinov, O. and Aben, R. and Abi, B. and Abolins, M. and AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Abreu, R. and Abulaiti, Y. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Adelman, J. and Adomeit, S. and Adye, T.},
abstractNote = {Simultaneous measurements of the tt¯, W+W–, and Z/γ*→ττ production cross-sections using an integrated luminosity of 4.6 fb–1 of pp collisions at √s=7 TeV collected by the ATLAS detector at the LHC are presented. Events are selected with two high transverse momentum leptons consisting of an oppositely charged electron and muon pair. The three processes are separated using the distributions of the missing transverse momentum of events with zero and greater than zero jet multiplicities. Measurements of the fiducial cross-section are presented along with results that quantify for the first time the underlying correlations in the predicted and measured cross-sections due to proton parton distribution functions. Results indicate that the correlated next-to-leading-order predictions for tt¯ and Z/γ*→ττ underestimate the data, while those at next-to-next-to-leading-order generally describe the data well. The full cross-sections are measured to be σ(tt¯)=181.2 ± 2.8+9.7–9.5 ± 3.3 ± 3.3 pb, σ(W+W–) = 53.3 ± 2.7+7.3–8.0 ± 1.0 ± 0.5 pb, and σ(Z/γ*→ττ) = 1174 ± 24+72–87 ± 21 ± 9 pb, where the cited uncertainties are due to statistics, systematic effects, luminosity and the LHC beam energy measurement, respectively. The W+W– measurement includes the small contribution from Higgs boson decays, H → W+W–.},
doi = {10.1103/PhysRevD.91.052005},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
issn = {1550-7998},
number = 5,
volume = 91,
place = {United States},
year = {2015},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.91.052005

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