Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton-proton collisions at the LHC

M. Aaboud; G. Aad; B. Abbott; J. Abdallah; O. Abdinov; B Abeloos; R. Aben; O.S. AbouZeid; NL Abraham; H. Abramowicz; H. Abreu; R. Abreu; Y. Abulaiti; B.S. Acharya; David L. Adams; Mogens Dam; Jørn Dines Hansen; Jørgen Beck Hansen; Stefania Xella; Peter Henrik Hansen; Troels Christian Petersen; Lotte Ansgaard Thomsen; Alejandro Alonso Diaz; James William Monk; Graig Wiglesworth; Lars Egholm Pedersen; Geert-Jan Besjes; Simon Holm Stark; Gorm Aske Gram Krohn Galster; Ask Emil Løvschall-Jensen; Fabian Alexander Jürgen Thiele; Flavia de Almeida Dias; Milena Bajic; John Barr; H. Zhu

doi:10.1140/epjc/s10052-017-4887-5

Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton-proton collisions at the LHC

M. Aaboud, G. Aad, B. Abbott, J. Abdallah, O. Abdinov, B Abeloos, R. Aben, O.S. AbouZeid, NL Abraham, H. Abramowicz, H. Abreu, R. Abreu, Y. Abulaiti, B.S. Acharya, David L. Adams, Mogens Dam, Jørn Dines Hansen, Jørgen Beck Hansen, Stefania Xella, Peter Henrik HansenTroels Christian Petersen, Lotte Ansgaard Thomsen, Alejandro Alonso Diaz, James William Monk, Graig Wiglesworth, Lars Egholm Pedersen, Geert-Jan Besjes, Simon Holm Stark, Gorm Aske Gram Krohn Galster, Ask Emil Løvschall-Jensen, Fabian Alexander Jürgen Thiele, Flavia de Almeida Dias, Milena Bajic, John Barr, H. Zhu

Experimental Particle Physics

32 Citations (Scopus)

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Abstract

This paper presents the method and performance of primary vertex reconstruction in proton–proton collision data recorded by the ATLAS experiment during Run 1 of the LHC. The studies presented focus on data taken during 2012 at a centre-of-mass energy of s=8 TeV. The performance has been measured as a function of the number of interactions per bunch crossing over a wide range, from one to seventy. The measurement of the position and size of the luminous region and its use as a constraint to improve the primary vertex resolution are discussed. A longitudinal vertex position resolution of about 30μm is achieved for events with high multiplicity of reconstructed tracks. The transverse position resolution is better than 20μm and is dominated by the precision on the size of the luminous region. An analytical model is proposed to describe the primary vertex reconstruction efficiency as a function of the number of interactions per bunch crossing and of the longitudinal size of the luminous region. Agreement between the data and the predictions of this model is better than 3% up to seventy interactions per bunch crossing.

Original language	English
Article number	332
Journal	European Physical Journal C
Volume	77
Issue number	5
ISSN	1434-6044
DOIs	https://doi.org/10.1140/epjc/s10052-017-4887-5
Publication status	Published - 1 May 2017

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Aaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., Aben, R., AbouZeid, O. S., Abraham, NL., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adams, D. L., Dam, M., Hansen, J. D., Hansen, J. B., Xella, S., ... Zhu, H. (2017). Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton-proton collisions at the LHC. European Physical Journal C, 77(5), [332]. https://doi.org/10.1140/epjc/s10052-017-4887-5

Aaboud, M, Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Abeloos, B, Aben, R, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H, Abreu, R, Abulaiti, Y, Acharya, BS, Adams, DL, Dam, M , Hansen, JD , Hansen, JB , Xella, S , Hansen, PH , Petersen, TC, Thomsen, LA, Alonso Diaz, A, Monk, JW, Wiglesworth, G, Pedersen, LE, Besjes, G-J, Stark, SH, Galster, GAGK, Løvschall-Jensen, AE, Thiele, FAJ, de Almeida Dias, F, Bajic, M, Barr, J & Zhu, H 2017, 'Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton-proton collisions at the LHC', European Physical Journal C, vol. 77, no. 5, 332. https://doi.org/10.1140/epjc/s10052-017-4887-5

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title = "Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton-proton collisions at the LHC",

abstract = "This paper presents the method and performance of primary vertex reconstruction in proton–proton collision data recorded by the ATLAS experiment during Run 1 of the LHC. The studies presented focus on data taken during 2012 at a centre-of-mass energy of s=8 TeV. The performance has been measured as a function of the number of interactions per bunch crossing over a wide range, from one to seventy. The measurement of the position and size of the luminous region and its use as a constraint to improve the primary vertex resolution are discussed. A longitudinal vertex position resolution of about 30μm is achieved for events with high multiplicity of reconstructed tracks. The transverse position resolution is better than 20μm and is dominated by the precision on the size of the luminous region. An analytical model is proposed to describe the primary vertex reconstruction efficiency as a function of the number of interactions per bunch crossing and of the longitudinal size of the luminous region. Agreement between the data and the predictions of this model is better than 3% up to seventy interactions per bunch crossing.",

author = "M. Aaboud and G. Aad and B. Abbott and J. Abdallah and O. Abdinov and B Abeloos and R. Aben and O.S. AbouZeid and NL Abraham and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and B.S. Acharya and Adams, {David L.} 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 Thomsen, {Lotte Ansgaard} and {Alonso Diaz}, Alejandro and Monk, {James William} and Graig Wiglesworth and Pedersen, {Lars Egholm} and Geert-Jan Besjes and Stark, {Simon Holm} and Galster, {Gorm Aske Gram Krohn} and L{\o}vschall-Jensen, {Ask Emil} and Thiele, {Fabian Alexander J{\"u}rgen} and {de Almeida Dias}, Flavia and Milena Bajic and John Barr and H. Zhu",

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T1 - Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton-proton collisions at the LHC

AU - Aaboud, M.

AU - Aad, G.

AU - Abbott, B.

AU - Abdallah, J.

AU - Abdinov, O.

AU - Abeloos, B

AU - Aben, R.

AU - AbouZeid, O.S.

AU - Abraham, NL

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abreu, R.

AU - Abulaiti, Y.

AU - Acharya, B.S.

AU - Adams, David L.

AU - Dam, Mogens

AU - Hansen, Jørn Dines

AU - Hansen, Jørgen Beck

AU - Xella, Stefania

AU - Hansen, Peter Henrik

AU - Petersen, Troels Christian

AU - Thomsen, Lotte Ansgaard

AU - Alonso Diaz, Alejandro

AU - Monk, James William

AU - Wiglesworth, Graig

AU - Pedersen, Lars Egholm

AU - Besjes, Geert-Jan

AU - Stark, Simon Holm

AU - Galster, Gorm Aske Gram Krohn

AU - Løvschall-Jensen, Ask Emil

AU - Thiele, Fabian Alexander Jürgen

AU - de Almeida Dias, Flavia

AU - Bajic, Milena

AU - Barr, John

AU - Zhu, H.

PY - 2017/5/1

Y1 - 2017/5/1

N2 - This paper presents the method and performance of primary vertex reconstruction in proton–proton collision data recorded by the ATLAS experiment during Run 1 of the LHC. The studies presented focus on data taken during 2012 at a centre-of-mass energy of s=8 TeV. The performance has been measured as a function of the number of interactions per bunch crossing over a wide range, from one to seventy. The measurement of the position and size of the luminous region and its use as a constraint to improve the primary vertex resolution are discussed. A longitudinal vertex position resolution of about 30μm is achieved for events with high multiplicity of reconstructed tracks. The transverse position resolution is better than 20μm and is dominated by the precision on the size of the luminous region. An analytical model is proposed to describe the primary vertex reconstruction efficiency as a function of the number of interactions per bunch crossing and of the longitudinal size of the luminous region. Agreement between the data and the predictions of this model is better than 3% up to seventy interactions per bunch crossing.

AB - This paper presents the method and performance of primary vertex reconstruction in proton–proton collision data recorded by the ATLAS experiment during Run 1 of the LHC. The studies presented focus on data taken during 2012 at a centre-of-mass energy of s=8 TeV. The performance has been measured as a function of the number of interactions per bunch crossing over a wide range, from one to seventy. The measurement of the position and size of the luminous region and its use as a constraint to improve the primary vertex resolution are discussed. A longitudinal vertex position resolution of about 30μm is achieved for events with high multiplicity of reconstructed tracks. The transverse position resolution is better than 20μm and is dominated by the precision on the size of the luminous region. An analytical model is proposed to describe the primary vertex reconstruction efficiency as a function of the number of interactions per bunch crossing and of the longitudinal size of the luminous region. Agreement between the data and the predictions of this model is better than 3% up to seventy interactions per bunch crossing.

U2 - 10.1140/epjc/s10052-017-4887-5

DO - 10.1140/epjc/s10052-017-4887-5

M3 - Journal article

C2 - 28943786

SN - 1434-6044

VL - 77

JO - The European Physical Journal C: Particles and Fields

JF - The European Physical Journal C: Particles and Fields

IS - 5

M1 - 332

ER -

Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton-proton collisions at the LHC

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