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Measurement of chi(c1) and chi(c2) production with root s=7 TeV pp collisions at ATLAS
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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Number of Authors: 2933
2014 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 7, 154- p.Article in journal (Refereed) Published
Abstract [en]

The prompt and non-prompt production cross-sections for the χ c1 and χ c2 charmonium states are measured in pp collisions at TeX = 7 TeV with the ATLAS detector at the LHC using 4.5 fb−1 of integrated luminosity. The χ c states are reconstructed through the radiative decay χ c J/ψγ (with J/ψμ + μ ) where photons are reconstructed from γe + e conversions. The production rate of the χ c2 state relative to the χ c1 state is measured for prompt and non-prompt χ c as a function of J/ψ transverse momentum. The prompt χ c cross-sections are combined with existing measurements of prompt J/ψ production to derive the fraction of prompt J/ψ produced in feed-down from χ c decays. The fractions of χ c1 and χ c2 produced in b-hadron decays are also measured.

Place, publisher, year, edition, pages
2014. no 7, 154- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-232771DOI: 10.1007/JHEP07(2014)154ISI: 000340391300001OAI: oai:DiVA.org:uu-232771DiVA: diva2:749674
Note

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP07(2014)154

Available from: 2014-09-24 Created: 2014-09-24 Last updated: 2017-12-05Bibliographically approved

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Brenner, RichardConiavitis, EliasEkelöf, TordEllert, MattiasFerrari, ArnaudIsaksson, CharlieMadsen, AlexanderPelikan, Daniel
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High Energy PhysicsDepartment of Physics and Astronomy
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