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Z' physics with early LHC data

Z' physics with early LHC data
Z' physics with early LHC data
We discuss the prospects for setting limits on or discovering spin-1 Z? bosons using early LHC data at 7 TeV. Our results are based on the narrow width approximation in which the leptonic Drell-Yan Z? boson production cross section only depends on the Z? boson mass together with two parameters cu and cd. We carefully discuss the experimental cuts that should be applied and tabulate the theoretical next-to-next-to-leading order corrections which must be included. Using these results the approach then provides a safe, convenient, and unbiased way of comparing experiment to theoretical models which avoids any built-in model-dependent assumptions. We apply the method to three classes of perturbative Z? boson benchmark models: E6 models, left-right symmetric models, and sequential standard models. We generalize each class of model in terms of mixing angles which continuously parametrize linear combinations of pairs of generators and lead to distinctive orbits in the cu-cd plane. We also apply this method to the strongly coupled four-site benchmark model in which two Z? bosons are predicted. By comparing the experimental limits or discovery bands to the theoretical predictions on the cu-cd plane, we show that the LHC at 7 TeV with integrated luminosity of 500??pb-1 will greatly improve on current Tevatron mass limits for the benchmark models. If a Z? is discovered our results show that measurement of the mass and cross section will provide a powerful discriminator between the benchmark models using this approach.

1550-7998
075012-[23pp]
Accomando, Elena
8ebc75d7-bd92-4f70-a974-7bc15ebf088f
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
Fedeli, Luca
1ddd6a40-9ad1-4453-9eda-b2122d20878b
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Shepherd-Themistocleous, Claire
a29b4897-1b61-4774-8df7-0f507d905d81
Accomando, Elena
8ebc75d7-bd92-4f70-a974-7bc15ebf088f
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
Fedeli, Luca
1ddd6a40-9ad1-4453-9eda-b2122d20878b
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Shepherd-Themistocleous, Claire
a29b4897-1b61-4774-8df7-0f507d905d81

Accomando, Elena, Belyaev, Alexander, Fedeli, Luca, King, Stephen F. and Shepherd-Themistocleous, Claire (2011) Z' physics with early LHC data. Physical Review D, 83 (7), 075012-[23pp]. (doi:10.1103/PhysRevD.83.075012).

Record type: Article

Abstract

We discuss the prospects for setting limits on or discovering spin-1 Z? bosons using early LHC data at 7 TeV. Our results are based on the narrow width approximation in which the leptonic Drell-Yan Z? boson production cross section only depends on the Z? boson mass together with two parameters cu and cd. We carefully discuss the experimental cuts that should be applied and tabulate the theoretical next-to-next-to-leading order corrections which must be included. Using these results the approach then provides a safe, convenient, and unbiased way of comparing experiment to theoretical models which avoids any built-in model-dependent assumptions. We apply the method to three classes of perturbative Z? boson benchmark models: E6 models, left-right symmetric models, and sequential standard models. We generalize each class of model in terms of mixing angles which continuously parametrize linear combinations of pairs of generators and lead to distinctive orbits in the cu-cd plane. We also apply this method to the strongly coupled four-site benchmark model in which two Z? bosons are predicted. By comparing the experimental limits or discovery bands to the theoretical predictions on the cu-cd plane, we show that the LHC at 7 TeV with integrated luminosity of 500??pb-1 will greatly improve on current Tevatron mass limits for the benchmark models. If a Z? is discovered our results show that measurement of the mass and cross section will provide a powerful discriminator between the benchmark models using this approach.

Full text not available from this repository.

More information

Published date: 2011
Organisations: Theory Group

Identifiers

Local EPrints ID: 193503
URI: https://eprints.soton.ac.uk/id/eprint/193503
ISSN: 1550-7998
PURE UUID: 00cb3542-ce9d-43d7-a121-8e6ea4633f89
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

Catalogue record

Date deposited: 14 Jul 2011 15:13
Last modified: 06 Jun 2018 12:38

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