Measurement of tau polarisation in Z/gamma* -> tau tau decays in proton-proton collisions at root s=8 TeV with the ATLAS detector

M. Aaboud; G. Aad; B. Abbott; O. Abdinov; B Abeloos; S.H. Abidi; Ossama Sherif Alexander Abouzeid; NL Abraham; H. Abramowicz; H. Abreu; R. Abreu; Y. Abulaiti; B.S. Acharya; Shin-ichi Adachi; L. Adamczyk; J. Adelman; M. Adersberger; T. Adye; A. A. Affolder; Y.  Afik; T. Agatonovic-Jovin; S. P. Ahlen; Peter Henrik Hansen; Stefania Xella; James William Monk; Mogens Dam; Fabian Alexander Jürgen Thiele; Troels Christian Petersen; Jørn Dines Hansen; Geert-Jan Besjes; Simon Holm Stark; Gorm Aske Gram Krohn Galster; Alejandro Alonso Diaz; Graig Wiglesworth; Flavia de Almeida Dias; Jørgen Beck Hansen; Milena Bajic

doi:10.1140/epjc/s10052-018-5619-1

Measurement of tau polarisation in Z/gamma* -> tau tau decays in proton-proton collisions at root s=8 TeV with the ATLAS detector

M. Aaboud, G. Aad, B. Abbott, O. Abdinov, B Abeloos, S.H. Abidi, Ossama Sherif Alexander Abouzeid, NL Abraham, H. Abramowicz, H. Abreu, R. Abreu, Y. Abulaiti, B.S. Acharya, Shin-ichi Adachi, L. Adamczyk, J. Adelman, M. Adersberger, T. Adye, A. A. Affolder, Y. AfikT. Agatonovic-Jovin, S. P. Ahlen, Peter Henrik Hansen, Stefania Xella, James William Monk, Mogens Dam, Fabian Alexander Jürgen Thiele, Troels Christian Petersen, Jørn Dines Hansen, Geert-Jan Besjes, Simon Holm Stark, Gorm Aske Gram Krohn Galster, Alejandro Alonso Diaz, Graig Wiglesworth, Flavia de Almeida Dias, Jørgen Beck Hansen, Milena Bajic

Experimental Particle Physics

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Abstract

This paper presents a measurement of the polarisation of τ leptons produced in Z/ γ^∗→ ττ decays which is performed with a dataset of proton—proton collisions at s=8 TeV, corresponding to an integrated luminosity of 20.2 fb^{- 1} recorded with the ATLAS detector at the LHC in 2012. The Z/ γ^∗→ ττ decays are reconstructed from a hadronically decaying τ lepton with a single charged particle in the final state, accompanied by a τ lepton that decays leptonically. The τ polarisation is inferred from the relative fraction of energy carried by charged and neutral hadrons in the hadronic τ decays. The polarisation is measured in a fiducial region that corresponds to the kinematic region accessible to this analysis. The τ polarisation extracted over the full phase space within the Z/ γ^∗ mass range of 66 <mZ/ 116 GeV is found to be P_τ= - 0.14 ± 0.02 (stat) ± 0.04 (syst). It is in agreement with the Standard Model prediction of P_τ= - 0.1517 ± 0.0019 , which is obtained from the ALPGEN event generator interfaced with the PYTHIA 6 parton shower modelling and the TAUOLA τ decay library.

Original language	English
Article number	163
Journal	European Physical Journal C
Volume	78
Issue number	2
Number of pages	30
ISSN	1434-6044
DOIs	https://doi.org/10.1140/epjc/s10052-018-5619-1
Publication status	Published - 1 Feb 2018

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Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abidi, S. H., Abouzeid, O. S. A., Abraham, NL., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adachi, S., Adamczyk, L., Adelman, J., Adersberger, M., Adye, T., Affolder, A. A., ... Bajic, M. (2018). Measurement of tau polarisation in Z/gamma* -> tau tau decays in proton-proton collisions at root s=8 TeV with the ATLAS detector. European Physical Journal C, 78(2), Article 163. https://doi.org/10.1140/epjc/s10052-018-5619-1

Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, Abouzeid, OSA, Abraham, NL, Abramowicz, H, Abreu, H, Abreu, R, Abulaiti, Y, Acharya, BS, Adachi, S, Adamczyk, L, Adelman, J, Adersberger, M, Adye, T, Affolder, AA, Afik, Y, Agatonovic-Jovin, T, Ahlen, SP, Hansen, PH , Xella, S, Monk, JW, Dam, M, Thiele, FAJ, Petersen, TC , Hansen, JD, Besjes, G-J, Stark, SH, Galster, GAGK, Alonso Diaz, A, Wiglesworth, G, de Almeida Dias, F, Hansen, JB & Bajic, M 2018, 'Measurement of tau polarisation in Z/gamma* -> tau tau decays in proton-proton collisions at root s=8 TeV with the ATLAS detector', European Physical Journal C, vol. 78, no. 2, 163. https://doi.org/10.1140/epjc/s10052-018-5619-1

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title = "Measurement of tau polarisation in Z/gamma* -> tau tau decays in proton-proton collisions at root s=8 TeV with the ATLAS detector",

abstract = "This paper presents a measurement of the polarisation of τ leptons produced in Z/ γ∗→ ττ decays which is performed with a dataset of proton—proton collisions at s=8 TeV, corresponding to an integrated luminosity of 20.2 fb- 1 recorded with the ATLAS detector at the LHC in 2012. The Z/ γ∗→ ττ decays are reconstructed from a hadronically decaying τ lepton with a single charged particle in the final state, accompanied by a τ lepton that decays leptonically. The τ polarisation is inferred from the relative fraction of energy carried by charged and neutral hadrons in the hadronic τ decays. The polarisation is measured in a fiducial region that corresponds to the kinematic region accessible to this analysis. The τ polarisation extracted over the full phase space within the Z/ γ∗ mass range of 66 τ= - 0.14 ± 0.02 (stat) ± 0.04 (syst). It is in agreement with the Standard Model prediction of Pτ= - 0.1517 ± 0.0019 , which is obtained from the ALPGEN event generator interfaced with the PYTHIA 6 parton shower modelling and the TAUOLA τ decay library.",

author = "M. Aaboud and G. Aad and B. Abbott and O. Abdinov and B Abeloos and S.H. Abidi and Abouzeid, {Ossama Sherif Alexander} and NL Abraham and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and B.S. Acharya and Shin-ichi Adachi and L. Adamczyk and J. Adelman and M. Adersberger and T. Adye and Affolder, {A. A.} and Y. Afik and T. Agatonovic-Jovin and Ahlen, {S. P.} and Hansen, {Peter Henrik} and Stefania Xella and Monk, {James William} and Mogens Dam and Thiele, {Fabian Alexander J{\"u}rgen} and Petersen, {Troels Christian} and Hansen, {J{\o}rn Dines} and Geert-Jan Besjes and Stark, {Simon Holm} and Galster, {Gorm Aske Gram Krohn} and {Alonso Diaz}, Alejandro and Graig Wiglesworth and {de Almeida Dias}, Flavia and Hansen, {J{\o}rgen Beck} and Milena Bajic",

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T1 - Measurement of tau polarisation in Z/gamma* -> tau tau decays in proton-proton collisions at root s=8 TeV with the ATLAS detector

AU - Aaboud, M.

AU - Aad, G.

AU - Abbott, B.

AU - Abdinov, O.

AU - Abeloos, B

AU - Abidi, S.H.

AU - Abouzeid, Ossama Sherif Alexander

AU - Abraham, NL

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abreu, R.

AU - Abulaiti, Y.

AU - Acharya, B.S.

AU - Adachi, Shin-ichi

AU - Adamczyk, L.

AU - Adelman, J.

AU - Adersberger, M.

AU - Adye, T.

AU - Affolder, A. A.

AU - Afik, Y.

AU - Agatonovic-Jovin, T.

AU - Ahlen, S. P.

AU - Hansen, Peter Henrik

AU - Xella, Stefania

AU - Monk, James William

AU - Dam, Mogens

AU - Thiele, Fabian Alexander Jürgen

AU - Petersen, Troels Christian

AU - Hansen, Jørn Dines

AU - Besjes, Geert-Jan

AU - Stark, Simon Holm

AU - Galster, Gorm Aske Gram Krohn

AU - Alonso Diaz, Alejandro

AU - Wiglesworth, Graig

AU - de Almeida Dias, Flavia

AU - Hansen, Jørgen Beck

AU - Bajic, Milena

PY - 2018/2/1

Y1 - 2018/2/1

N2 - This paper presents a measurement of the polarisation of τ leptons produced in Z/ γ∗→ ττ decays which is performed with a dataset of proton—proton collisions at s=8 TeV, corresponding to an integrated luminosity of 20.2 fb- 1 recorded with the ATLAS detector at the LHC in 2012. The Z/ γ∗→ ττ decays are reconstructed from a hadronically decaying τ lepton with a single charged particle in the final state, accompanied by a τ lepton that decays leptonically. The τ polarisation is inferred from the relative fraction of energy carried by charged and neutral hadrons in the hadronic τ decays. The polarisation is measured in a fiducial region that corresponds to the kinematic region accessible to this analysis. The τ polarisation extracted over the full phase space within the Z/ γ∗ mass range of 66 τ= - 0.14 ± 0.02 (stat) ± 0.04 (syst). It is in agreement with the Standard Model prediction of Pτ= - 0.1517 ± 0.0019 , which is obtained from the ALPGEN event generator interfaced with the PYTHIA 6 parton shower modelling and the TAUOLA τ decay library.

AB - This paper presents a measurement of the polarisation of τ leptons produced in Z/ γ∗→ ττ decays which is performed with a dataset of proton—proton collisions at s=8 TeV, corresponding to an integrated luminosity of 20.2 fb- 1 recorded with the ATLAS detector at the LHC in 2012. The Z/ γ∗→ ττ decays are reconstructed from a hadronically decaying τ lepton with a single charged particle in the final state, accompanied by a τ lepton that decays leptonically. The τ polarisation is inferred from the relative fraction of energy carried by charged and neutral hadrons in the hadronic τ decays. The polarisation is measured in a fiducial region that corresponds to the kinematic region accessible to this analysis. The τ polarisation extracted over the full phase space within the Z/ γ∗ mass range of 66 τ= - 0.14 ± 0.02 (stat) ± 0.04 (syst). It is in agreement with the Standard Model prediction of Pτ= - 0.1517 ± 0.0019 , which is obtained from the ALPGEN event generator interfaced with the PYTHIA 6 parton shower modelling and the TAUOLA τ decay library.

U2 - 10.1140/epjc/s10052-018-5619-1

DO - 10.1140/epjc/s10052-018-5619-1

M3 - Journal article

C2 - 31265004

SN - 1434-6044

VL - 78

JO - European Physical Journal C

JF - European Physical Journal C

IS - 2

M1 - 163

ER -

Measurement of tau polarisation in Z/gamma* -> tau tau decays in proton-proton collisions at root s=8 TeV with the ATLAS detector

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