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Neutral current forward–backward asymmetry: from θW to PDF determinations

Neutral current forward–backward asymmetry: from θW to PDF determinations
Neutral current forward–backward asymmetry: from θW to PDF determinations

Measurements of the forward–backward asymmetry in neutral-current Drell–Yan di-lepton production have primarily been used for determinations of the weak mixing angle θW. We observe that, unlike the case of Run-I of the Large Hadron Collider (LHC Run-I), for the first time at the LHC Run-II the reconstructed forward–backward asymmetry has the capability of placing useful constraints on the determination of the parton distribution functions (PDFs). By examining the statistical and the PDF uncertainties on the reconstructed forward–backward asymmetry, we investigate its potential for disentangling the flavour content of quark and antiquark PDFs. Access to the valence/sea u-quark and to the sea up-type antiquark PDFs, in particular, may be gained by the appropriate use of selection cuts in the rapidity of the emerging lepton pair in regions both near the Z-boson peak and away from it, in a manner complementary, though more indirect, to the case of the charged-current asymmetry. We study the extension of these results for the planned high-luminosity (HL) LHC.

1434-6044
Accomando, E.
8ebc75d7-bd92-4f70-a974-7bc15ebf088f
Fiaschi, J.
a417f04d-05ec-4bff-bdee-ba20ac560fa7
Hautmann, F.
226fd98a-070e-478e-a02e-42a918dca6c0
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Accomando, E.
8ebc75d7-bd92-4f70-a974-7bc15ebf088f
Fiaschi, J.
a417f04d-05ec-4bff-bdee-ba20ac560fa7
Hautmann, F.
226fd98a-070e-478e-a02e-42a918dca6c0
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614

Accomando, E., Fiaschi, J., Hautmann, F. and Moretti, S. (2018) Neutral current forward–backward asymmetry: from θW to PDF determinations. The European Physical Journal C, 78 (8). (doi:10.1140/epjc/s10052-018-6120-6).

Record type: Article

Abstract

Measurements of the forward–backward asymmetry in neutral-current Drell–Yan di-lepton production have primarily been used for determinations of the weak mixing angle θW. We observe that, unlike the case of Run-I of the Large Hadron Collider (LHC Run-I), for the first time at the LHC Run-II the reconstructed forward–backward asymmetry has the capability of placing useful constraints on the determination of the parton distribution functions (PDFs). By examining the statistical and the PDF uncertainties on the reconstructed forward–backward asymmetry, we investigate its potential for disentangling the flavour content of quark and antiquark PDFs. Access to the valence/sea u-quark and to the sea up-type antiquark PDFs, in particular, may be gained by the appropriate use of selection cuts in the rapidity of the emerging lepton pair in regions both near the Z-boson peak and away from it, in a manner complementary, though more indirect, to the case of the charged-current asymmetry. We study the extension of these results for the planned high-luminosity (HL) LHC.

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Accepted/In Press date: 27 July 2018
e-pub ahead of print date: 19 August 2018
Published date: 19 August 2018

Identifiers

Local EPrints ID: 424444
URI: https://eprints.soton.ac.uk/id/eprint/424444
ISSN: 1434-6044
PURE UUID: 303112fd-75d2-4ff7-b704-1fd6acd94259

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Date deposited: 05 Oct 2018 11:37
Last modified: 13 Mar 2019 18:06

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Contributors

Author: E. Accomando
Author: J. Fiaschi
Author: F. Hautmann
Author: S. Moretti

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