Measurement of χc1 and χc2 production with √s = 7 TeV pp collisions at ATLAS

G. Aad; B. Abbott; J. Abdallah; S. Abdel Khalek; O. Abdinov; R. Aben; B. Abi; M. Abolins; Mogens Dam; Jørn Dines Hansen; Jørgen Beck Hansen; Stefania Xella; Peter Henrik Hansen; Troels Christian Petersen; Lars Egholm Pedersen; Lotte Ansgaard Thomsen; Alejandro Alonso Diaz; Gorm Aske Gram Krohn Galster; Sascha Mehlhase; Morten Dam Jørgensen; Almut Maria Pingel; Ask Emil Løvschall-Jensen; James William Monk; Graig Wiglesworth

doi:10.1007/jhep07(2014)154

Measurement of χ_c1 and χ_c2 production with √s = 7 TeV pp collisions at ATLAS

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, M. Abolins, Mogens Dam, Jørn Dines Hansen, Jørgen Beck Hansen, Stefania Xella, Peter Henrik Hansen, Troels Christian Petersen, Lars Egholm Pedersen, Lotte Ansgaard Thomsen, Alejandro Alonso Diaz, Gorm Aske Gram Krohn Galster, Sascha Mehlhase, Morten Dam JørgensenAlmut Maria Pingel, Ask Emil Løvschall-Jensen, James William Monk, Graig Wiglesworth

Experimental Particle Physics

28 Citations (Scopus)

Abstract

The prompt and non-prompt production cross-sections for the χ_c1and χ_c2charmonium states are measured in pp collisions at √s = 7TeV with the ATLAS detector at the LHC using 4.5 fb⁻¹of integrated luminosity. The χ_cstates are reconstructed through the radiative decay χ_c→ J/ψγ (with J/ψ → μ⁺μ⁻) where photons are reconstructed from γ → e+e− conversions. The production rate of the χ_c2state relative to the χ_c1state is measured for prompt and non-prompt χ_cas a function of J/ψ transverse momentum. The prompt χ_ccross-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_cdecays. The fractions of χ_c1and χ_c2produced in b-hadron decays are also measured.

Original language	English
Article number	1407
Journal	Journal of High Energy Physics (Online)
Volume	2014
Issue number	154
Number of pages	52
ISSN	1126-6708
DOIs	https://doi.org/10.1007/jhep07(2014)154
Publication status	Published - 30 Jul 2014

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Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., Aben, R., Abi, B., Abolins, M., Dam, M., Hansen, J. D., Hansen, J. B., Xella, S., Hansen, P. H., Petersen, T. C., Pedersen, L. E., Thomsen, L. A., Alonso Diaz, A., Galster, G. A. G. K., Mehlhase, S., ... Wiglesworth, G. (2014). Measurement of χ_c1 and χ_c2 production with √s = 7 TeV pp collisions at ATLAS. Journal of High Energy Physics (Online), 2014(154), Article 1407. https://doi.org/10.1007/jhep07(2014)154

Aad, G, Abbott, B, Abdallah, J, Abdel Khalek, S, Abdinov, O, Aben, R, Abi, B, Abolins, M, Dam, M , Hansen, JD , Hansen, JB , Xella, S , Hansen, PH , Petersen, TC, Pedersen, LE, Thomsen, LA, Alonso Diaz, A, Galster, GAGK, Mehlhase, S, Jørgensen, MD, Pingel, AM, Løvschall-Jensen, AE, Monk, JW & Wiglesworth, G 2014, 'Measurement of χ_c1 and χ_c2 production with √s = 7 TeV pp collisions at ATLAS', Journal of High Energy Physics (Online), vol. 2014, no. 154, 1407. https://doi.org/10.1007/jhep07(2014)154

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title = "Measurement of χc1 and χc2 production with √s = 7 TeV pp collisions at ATLAS",

abstract = "The prompt and non-prompt production cross-sections for the χc1and χc2charmonium states are measured in pp collisions at √s = 7TeV with the ATLAS detector at the LHC using 4.5 fb−1of integrated luminosity. The χcstates are reconstructed through the radiative decay χc→ J/ψγ (with J/ψ → μ+μ−) where photons are reconstructed from γ → e+e− conversions. The production rate of the χc2state relative to the χc1state is measured for prompt and non-prompt χcas a function of J/ψ transverse momentum. The prompt χccross-sections are combined with existing measurements of prompt J/ψ production to derive the fraction of prompt J/ψ produced in feed-down from χcdecays. The fractions of χc1and χc2produced in b-hadron decays are also measured.",

author = "G. Aad and B. Abbott and J. Abdallah and {Abdel Khalek}, S. and O. Abdinov and R. Aben and B. Abi and M. Abolins and Mogens Dam and Hansen, {J{\o}rn Dines} and Hansen, {J{\o}rgen Beck} and Stefania Xella and Hansen, {Peter Henrik} and Petersen, {Troels Christian} and Pedersen, {Lars Egholm} and Thomsen, {Lotte Ansgaard} and {Alonso Diaz}, Alejandro and Galster, {Gorm Aske Gram Krohn} and Sascha Mehlhase and J{\o}rgensen, {Morten Dam} and Pingel, {Almut Maria} and L{\o}vschall-Jensen, {Ask Emil} and Monk, {James William} and Graig Wiglesworth",

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T1 - Measurement of χc1 and χc2 production with √s = 7 TeV pp collisions at ATLAS

AU - Aad, G.

AU - Abbott, B.

AU - Abdallah, J.

AU - Abdel Khalek, S.

AU - Abdinov, O.

AU - Aben, R.

AU - Abi, B.

AU - Abolins, M.

AU - Dam, Mogens

AU - Hansen, Jørn Dines

AU - Hansen, Jørgen Beck

AU - Xella, Stefania

AU - Hansen, Peter Henrik

AU - Petersen, Troels Christian

AU - Pedersen, Lars Egholm

AU - Thomsen, Lotte Ansgaard

AU - Alonso Diaz, Alejandro

AU - Galster, Gorm Aske Gram Krohn

AU - Mehlhase, Sascha

AU - Jørgensen, Morten Dam

AU - Pingel, Almut Maria

AU - Løvschall-Jensen, Ask Emil

AU - Monk, James William

AU - Wiglesworth, Graig

PY - 2014/7/30

Y1 - 2014/7/30

N2 - The prompt and non-prompt production cross-sections for the χc1and χc2charmonium states are measured in pp collisions at √s = 7TeV with the ATLAS detector at the LHC using 4.5 fb−1of integrated luminosity. The χcstates are reconstructed through the radiative decay χc→ J/ψγ (with J/ψ → μ+μ−) where photons are reconstructed from γ → e+e− conversions. The production rate of the χc2state relative to the χc1state is measured for prompt and non-prompt χcas a function of J/ψ transverse momentum. The prompt χccross-sections are combined with existing measurements of prompt J/ψ production to derive the fraction of prompt J/ψ produced in feed-down from χcdecays. The fractions of χc1and χc2produced in b-hadron decays are also measured.

AB - The prompt and non-prompt production cross-sections for the χc1and χc2charmonium states are measured in pp collisions at √s = 7TeV with the ATLAS detector at the LHC using 4.5 fb−1of integrated luminosity. The χcstates are reconstructed through the radiative decay χc→ J/ψγ (with J/ψ → μ+μ−) where photons are reconstructed from γ → e+e− conversions. The production rate of the χc2state relative to the χc1state is measured for prompt and non-prompt χcas a function of J/ψ transverse momentum. The prompt χccross-sections are combined with existing measurements of prompt J/ψ production to derive the fraction of prompt J/ψ produced in feed-down from χcdecays. The fractions of χc1and χc2produced in b-hadron decays are also measured.

U2 - 10.1007/jhep07(2014)154

DO - 10.1007/jhep07(2014)154

M3 - Journal article

SN - 1126-6708

VL - 2014

JO - Journal of High Energy Physics (Online)

JF - Journal of High Energy Physics (Online)

IS - 154

M1 - 1407

ER -

Measurement of χc1 and χc2 production with √s = 7 TeV pp collisions at ATLAS

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Measurement of χ_c1 and χ_c2 production with √s = 7 TeV pp collisions at ATLAS