Measurement of the ratio of cross sections for inclusive isolated-photon production in pp collisions at root s=13 and 8 TeV with the ATLAS detector

M. Aaboud; G. Aad; B. Abbott; O. Abdinov; B Abeloos; DK Abhayasinghe; S.H. Abidi; Ossama Sherif Alexander Abouzeid; NL Abraham; H. Abramowicz; H. Abreu; Y. Abulaiti; B.S. Acharya; Sosuke Adachi; L. Adamczyk; J. Adelman; M. Adersberger; A. Adiguzel; T. Adye; A. A. Affolder; Y.  Afik; C. Agheorghiesei; J. A. Aguilar-Saavedra; F. Ahmadov; G. Aielli; Alejandro Alonso Diaz; Geert-Jan Besjes; Milena Bajic; Flavia de Almeida Dias; Mogens Dam; hqz214 hqz214; Gorm Aske Gram Krohn Galster; Jørgen Beck Hansen; Jørn Dines Hansen; Peter Henrik Hansen; James William Monk; Simon Holm Stark; Troels Christian Petersen; Graig Wiglesworth; Stefania Xella; The ATLAS collaboration

doi:10.1007/JHEP04(2019)093

Measurement of the ratio of cross sections for inclusive isolated-photon production in pp collisions at root s=13 and 8 TeV with the ATLAS detector

M. Aaboud, G. Aad, B. Abbott, O. Abdinov, B Abeloos, DK Abhayasinghe, S.H. Abidi, Ossama Sherif Alexander Abouzeid, NL Abraham, H. Abramowicz, H. Abreu, Y. Abulaiti, B.S. Acharya, Sosuke Adachi, L. Adamczyk, J. Adelman, M. Adersberger, A. Adiguzel, T. Adye, A. A. AffolderY. Afik, C. Agheorghiesei, J. A. Aguilar-Saavedra, F. Ahmadov, G. Aielli, Alejandro Alonso Diaz, Geert-Jan Besjes, Milena Bajic, Flavia de Almeida Dias, Mogens Dam, hqz214 hqz214, Gorm Aske Gram Krohn Galster, Jørgen Beck Hansen, Jørn Dines Hansen, Peter Henrik Hansen, James William Monk, Simon Holm Stark, Troels Christian Petersen, Graig Wiglesworth, Stefania Xella, The ATLAS collaboration

Experimental Particle Physics

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Abstract

The ratio of the cross sections for inclusive isolated-photon production in pp collisions at centre-of-mass energies of 13 and 8 TeV is measured using the ATLAS detector at the LHC. The integrated luminosities of the 13 TeV and 8 TeV datasets are 3.2 fb ⁻¹ and 20.2 fb ⁻¹ , respectively. The ratio is measured as a function of the photon transverse energy in different regions of the photon pseudorapidity. The predictions from next-to-leading-order perturbative QCD calculations are compared with the measured ratio. The experimental systematic uncertainties as well as the uncertainties affecting the predictions are evaluated taking into account the correlations between the two centre-of-mass energies, resulting in a reduction of up to a factor of 2.5 (5) in the experimental (theoretical) systematic uncertainties. The predictions based on several parameterisations of the proton parton distribution functions agree with the data within the reduced experimental and theoretical uncertainties. In addition, this ratio to that of the fiducial cross sections for Z boson production at 13 and 8 TeV using the decay channels Z → e ⁺ e ⁻ and Z → μ ⁺ μ ⁻ is made and compared with the theoretical predictions. In this double ratio, a further reduction of the experimental uncertainty is obtained because the uncertainties arising from the luminosity measurement cancel out. The predictions describe the measurements of the double ratio within the theoretical and experimental uncertainties.[Figure not available: see fulltext.].

Original language	English
Article number	093
Journal	Journal of High Energy Physics
Volume	2019
Issue number	4
Number of pages	47
ISSN	1126-6708
DOIs	https://doi.org/10.1007/JHEP04(2019)093
Publication status	Published - 1 Apr 2019

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Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abhayasinghe, DK., Abidi, S. H., Abouzeid, O. S. A., Abraham, NL., Abramowicz, H., Abreu, H., Abulaiti, Y., Acharya, B. S., Adachi, S., Adamczyk, L., Adelman, J., Adersberger, M., Adiguzel, A., Adye, T., ... The ATLAS collaboration (2019). Measurement of the ratio of cross sections for inclusive isolated-photon production in pp collisions at root s=13 and 8 TeV with the ATLAS detector. Journal of High Energy Physics, 2019(4), [093]. https://doi.org/10.1007/JHEP04(2019)093

Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, Abouzeid, OSA, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Adachi, S, Adamczyk, L, Adelman, J, Adersberger, M, Adiguzel, A, Adye, T, Affolder, AA, Afik, Y, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmadov, F, Aielli, G, Alonso Diaz, A, Besjes, G-J, Bajic, M, de Almeida Dias, F, Dam, M, hqz214, H, Galster, GAGK, Hansen, JB , Hansen, JD , Hansen, PH, Monk, JW, Stark, SH, Petersen, TC , Wiglesworth, G , Xella, S & The ATLAS collaboration 2019, 'Measurement of the ratio of cross sections for inclusive isolated-photon production in pp collisions at root s=13 and 8 TeV with the ATLAS detector', Journal of High Energy Physics, vol. 2019, no. 4, 093. https://doi.org/10.1007/JHEP04(2019)093

@article{687f61a08e6642b2800fb45b514539df,

title = "Measurement of the ratio of cross sections for inclusive isolated-photon production in pp collisions at root s=13 and 8 TeV with the ATLAS detector",

abstract = " The ratio of the cross sections for inclusive isolated-photon production in pp collisions at centre-of-mass energies of 13 and 8 TeV is measured using the ATLAS detector at the LHC. The integrated luminosities of the 13 TeV and 8 TeV datasets are 3.2 fb −1 and 20.2 fb −1 , respectively. The ratio is measured as a function of the photon transverse energy in different regions of the photon pseudorapidity. The predictions from next-to-leading-order perturbative QCD calculations are compared with the measured ratio. The experimental systematic uncertainties as well as the uncertainties affecting the predictions are evaluated taking into account the correlations between the two centre-of-mass energies, resulting in a reduction of up to a factor of 2.5 (5) in the experimental (theoretical) systematic uncertainties. The predictions based on several parameterisations of the proton parton distribution functions agree with the data within the reduced experimental and theoretical uncertainties. In addition, this ratio to that of the fiducial cross sections for Z boson production at 13 and 8 TeV using the decay channels Z → e + e − and Z → μ + μ − is made and compared with the theoretical predictions. In this double ratio, a further reduction of the experimental uncertainty is obtained because the uncertainties arising from the luminosity measurement cancel out. The predictions describe the measurements of the double ratio within the theoretical and experimental uncertainties.[Figure not available: see fulltext.]. ",

author = "M. Aaboud and G. Aad and B. Abbott and O. Abdinov and B Abeloos and DK Abhayasinghe and S.H. Abidi and Abouzeid, {Ossama Sherif Alexander} and NL Abraham and H. Abramowicz and H. Abreu and Y. Abulaiti and B.S. Acharya and Sosuke Adachi and L. Adamczyk and J. Adelman and M. Adersberger and A. Adiguzel and T. Adye and Affolder, {A. A.} and Y. Afik and C. Agheorghiesei and Aguilar-Saavedra, {J. A.} and F. Ahmadov and G. Aielli and {Alonso Diaz}, Alejandro and Geert-Jan Besjes and Milena Bajic and {de Almeida Dias}, Flavia and Mogens Dam and hqz214 hqz214 and Galster, {Gorm Aske Gram Krohn} and Hansen, {J{\o}rgen Beck} and Hansen, {J{\o}rn Dines} and Hansen, {Peter Henrik} and Monk, {James William} and Stark, {Simon Holm} and Petersen, {Troels Christian} and Graig Wiglesworth and Stefania Xella and {The ATLAS collaboration}",

year = "2019",

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doi = "10.1007/JHEP04(2019)093",

language = "English",

volume = "2019",

journal = "Journal of High Energy Physics (Online)",

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T1 - Measurement of the ratio of cross sections for inclusive isolated-photon production in pp collisions at root s=13 and 8 TeV with the ATLAS detector

AU - Aaboud, M.

AU - Aad, G.

AU - Abbott, B.

AU - Abdinov, O.

AU - Abeloos, B

AU - Abhayasinghe, DK

AU - Abidi, S.H.

AU - Abouzeid, Ossama Sherif Alexander

AU - Abraham, NL

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abulaiti, Y.

AU - Acharya, B.S.

AU - Adachi, Sosuke

AU - Adamczyk, L.

AU - Adelman, J.

AU - Adersberger, M.

AU - Adiguzel, A.

AU - Adye, T.

AU - Affolder, A. A.

AU - Afik, Y.

AU - Agheorghiesei, C.

AU - Aguilar-Saavedra, J. A.

AU - Ahmadov, F.

AU - Aielli, G.

AU - Alonso Diaz, Alejandro

AU - Besjes, Geert-Jan

AU - Bajic, Milena

AU - de Almeida Dias, Flavia

AU - Dam, Mogens

AU - hqz214, hqz214

AU - Galster, Gorm Aske Gram Krohn

AU - Hansen, Jørgen Beck

AU - Hansen, Jørn Dines

AU - Hansen, Peter Henrik

AU - Monk, James William

AU - Stark, Simon Holm

AU - Petersen, Troels Christian

AU - Wiglesworth, Graig

AU - Xella, Stefania

AU - The ATLAS collaboration

PY - 2019/4/1

Y1 - 2019/4/1

N2 - The ratio of the cross sections for inclusive isolated-photon production in pp collisions at centre-of-mass energies of 13 and 8 TeV is measured using the ATLAS detector at the LHC. The integrated luminosities of the 13 TeV and 8 TeV datasets are 3.2 fb −1 and 20.2 fb −1 , respectively. The ratio is measured as a function of the photon transverse energy in different regions of the photon pseudorapidity. The predictions from next-to-leading-order perturbative QCD calculations are compared with the measured ratio. The experimental systematic uncertainties as well as the uncertainties affecting the predictions are evaluated taking into account the correlations between the two centre-of-mass energies, resulting in a reduction of up to a factor of 2.5 (5) in the experimental (theoretical) systematic uncertainties. The predictions based on several parameterisations of the proton parton distribution functions agree with the data within the reduced experimental and theoretical uncertainties. In addition, this ratio to that of the fiducial cross sections for Z boson production at 13 and 8 TeV using the decay channels Z → e + e − and Z → μ + μ − is made and compared with the theoretical predictions. In this double ratio, a further reduction of the experimental uncertainty is obtained because the uncertainties arising from the luminosity measurement cancel out. The predictions describe the measurements of the double ratio within the theoretical and experimental uncertainties.[Figure not available: see fulltext.].

AB - The ratio of the cross sections for inclusive isolated-photon production in pp collisions at centre-of-mass energies of 13 and 8 TeV is measured using the ATLAS detector at the LHC. The integrated luminosities of the 13 TeV and 8 TeV datasets are 3.2 fb −1 and 20.2 fb −1 , respectively. The ratio is measured as a function of the photon transverse energy in different regions of the photon pseudorapidity. The predictions from next-to-leading-order perturbative QCD calculations are compared with the measured ratio. The experimental systematic uncertainties as well as the uncertainties affecting the predictions are evaluated taking into account the correlations between the two centre-of-mass energies, resulting in a reduction of up to a factor of 2.5 (5) in the experimental (theoretical) systematic uncertainties. The predictions based on several parameterisations of the proton parton distribution functions agree with the data within the reduced experimental and theoretical uncertainties. In addition, this ratio to that of the fiducial cross sections for Z boson production at 13 and 8 TeV using the decay channels Z → e + e − and Z → μ + μ − is made and compared with the theoretical predictions. In this double ratio, a further reduction of the experimental uncertainty is obtained because the uncertainties arising from the luminosity measurement cancel out. The predictions describe the measurements of the double ratio within the theoretical and experimental uncertainties.[Figure not available: see fulltext.].

U2 - 10.1007/JHEP04(2019)093

DO - 10.1007/JHEP04(2019)093

M3 - Journal article

SN - 1126-6708

VL - 2019

JO - Journal of High Energy Physics (Online)

JF - Journal of High Energy Physics (Online)

IS - 4

M1 - 093

ER -

Measurement of the ratio of cross sections for inclusive isolated-photon production in pp collisions at root s=13 and 8 TeV with the ATLAS detector

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