Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV

Acharya, S.; Acosta, F. T. -.; Adamová, D.; Adolfsson, J.; Aggarwal, M. M.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahn, S. U.; Aiola, S.; Akindinov, A.; Al-Turany, M.; Alam, S. N.; Albuquerque, D. S.  D.; Aleksandrov, D.; Alessandro, B.; Alfaro Molina, R.; Ali, Y.; Alici, A.; Alkin, A.; Alme, J.; Alt, T.; Altenkamper, L.; Altsybeev, I.; Anaam, M. N.; Andrei, C.; Andreou, D.; Andrews, H. A.; Andronic, A.; Angeletti, M.; Anguelov, V.; Anson, C.; Antičić, T.; Antinori, F.; Antonioli, P.; Anwar, R.; Apadula, N.; Aphecetche, L.; Appelshäuser, H.; Arcelli, S.; Arnaldi, R.; Arnold, O. W.; Arsene, I. C.; Arslandok, M.; Audurier, B.; Augustinus, A.; Averbeck, R.; Azmi, M. D.; Badalà, A.; Baek, Y. W.; Bagnasco, S.; Bailhache, R.; Bala, R.; Baldisseri, A.; Ball, M.; Baral, R. C.; Barbano, A. M.; Barbera, R.; Barile, F.; Barioglio, L.; Barnaföldi, G. G.; Barnby, L. 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doi:10.1007/JHEP09(2018)064

Title: Dielectron production in proton-proton collisions at $$ \sqrt{s}=7 $$ TeV

Journal Article · Wed Sep 12 00:00:00 EDT 2018 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP09(2018)064· OSTI ID:1479705

Acharya, S.; Acosta, F. T. -.; Adamová, D.; Adolfsson, J.; Aggarwal, M. M.; Aglieri Rinella, G.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahn, S. U.; Aiola, S.; Akindinov, A.; Al-Turany, M.; Alam, S. N.; Albuquerque, D. S. D.; Aleksandrov, D.; Alessandro, B.; Alfaro Molina, R.; Ali, Y.; Alici, A. more »

The first measurement of e⁺e^- pair production at mid-rapidity (|η_e| < 0.8) in pp collisions at $$ \sqrt{s}=7 $$ TeV with ALICE at the LHC is presented. The dielectron production is studied as a function of the invariant mass (m_ee < 3.3 GeV/c²), the pair transverse momentum (pT,_ee < 8 GeV/c), and the pair transverse impact parameter (DCA_ee), i.e., the average distance of closest approach of the reconstructed electron and positron tracks to the collision vertex, normalised to its resolution. The results are compared with the expectations from a cocktail of known hadronic sources and are well described when PYTHIA is used to generate the heavy-flavour contributions. In the low-mass region (0.14 < m_ee < 1.1 GeV/c²), prompt and non-prompt e⁺e^- sources can be separated via the DCA_ee. In the intermediate-mass region (1.1 < m_ee < 2.7 GeV/c²), a double-differential fit to the data in m_ee and pT,_ee and a fit of the DCA_ee distribution allow the total c c ¯ and b b ¯ cross sections to be extracted. Two different event generators, PYTHIA and POWHEG, can reproduce the shape of the two-dimensional m_ee and pT,_ee spectra, as well as the shape of the DCA_ee distribution, reasonably well. However, differences in the $$ c\overline{c}\ $$ and $$ b\overline{b}\ $$ cross sections are observed when using the generators to extrapolate to full phase space. Finally, the ratio of inclusive to decay photons is studied via the measurement of virtual direct photons in the transverse-momentum range 1 < pT < 8 GeV/c. This is found to be unity within the statistical and systematic uncertainties and consistent with expectations from next-to-leading order perturbative quantum chromodynamic calculations.[Figure not available: see fulltext.].

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: The ALICE collaboration

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231

OSTI ID:: 1479705

Alternate ID(s):: OSTI ID: 1492324

Journal Information:: Journal of High Energy Physics (Online), Vol. 2018, Issue 9; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Low-Mass Dileptons at the CERN-SpS: Evidence for Chiral Restoration? Rapp, R.; Wambach, J. arXiv https://doi.org/10.48550/arxiv.hep-ph/9907502	text	January 1999
Does the Charm Flow at RHIC? Batsouli, S.; Kelly, S.; Gyulassy, M. arXiv https://doi.org/10.48550/arxiv.nucl-th/0212068	text	January 2002
Statistical hadronization of charm in heavy-ion collisions at SPS, RHIC and LHC Andronic, A.; Braun-Munzinger, P.; Redlich, K. arXiv https://doi.org/10.48550/arxiv.nucl-th/0303036	text	January 2003
Low-Energy Thermal Photons from Meson-Meson Bremsstrahlung Liu, W.; Rapp, R. arXiv https://doi.org/10.48550/arxiv.nucl-th/0604031	text	January 2006
Transport Dynamics of Broad Resonances Knoll, Jörn arXiv https://doi.org/10.48550/arxiv.nucl-th/9811099	text	January 1998

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Similar Records

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Journal Article · Fri Jul 23 00:00:00 EDT 2021 · Physical Review Letters · OSTI ID:1479705

Acharya, S.; Adamová, D.; Adler, A.; +1021 more

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
Heavy Ion Experiments

"Table 10" of "Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.83913.v1/t10 The current record is supplemented by this dataset	dataset	January 2018
"Table 11" of "Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.83913.v1/t11 The current record is supplemented by this dataset	dataset	January 2018
"Table 5" of "Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.83913.v1/t5 The current record is supplemented by this dataset	dataset	January 2018
"Table 4" of "Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.83913.v1/t4 The current record is supplemented by this dataset	dataset	January 2018
"Table 7" of "Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.83913.v1/t7 The current record is supplemented by this dataset	dataset	January 2018
"Table 6" of "Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.83913.v1/t6 The current record is supplemented by this dataset	dataset	January 2018
"Table 9" of "Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.83913.v1/t9 The current record is supplemented by this dataset	dataset	January 2018
"Table 8" of "Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.83913.v1/t8 The current record is supplemented by this dataset	dataset	January 2018
"Table 1" of "Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.83913.v1/t1 The current record is supplemented by this dataset	dataset	January 2018
"Table 3" of "Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.83913.v1/t3 The current record is supplemented by this dataset	dataset	January 2018
"Table 2" of "Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV" Collaboration, Alice https://doi.org/10.17182/hepdata.83913.v1/t2 The current record is supplemented by this dataset	dataset	January 2018
Dielectron production in proton-proton collisions at $ \sqrt{s}=7 $ TeV Collaboration, Alice https://doi.org/10.17182/hepdata.83913 The current record is supplemented by this collection	collection	January 2018