Z' physics with early LHC data

Accomando, Elena; Belyaev, Alexander; Fedeli, Luca; King, Stephen F.; Shepherd-Themistocleous, Claire

doi:10.1103/PhysRevD.83.075012

Z' physics with early LHC data

Elena Accomando
(
- Southampton U. and
- Rutherford
)
,
Alexander Belyaev
(
- Southampton U. and
- Rutherford
)
,
Luca Fedeli
(
- INFN, Florence and
- Florence U.
)
,
Stephen F. King
(
- Southampton U.
)
,
Claire Shepherd-Themistocleous
(
- Rutherford
)

Oct, 2010

26 pages

Published in:

Phys.Rev.D 83 (2011) 075012

e-Print:

1010.6058 [hep-ph]

DOI:

10.1103/PhysRevD.83.075012

Report number:

SHEP-10-36

View in:

ADS Abstract Service

pdf

reference search194 citations

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Abstract: (arXiv)

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

c_u

and

c_d

. 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:

E_6

models, left-right symmetric models and sequential standard models. We generalise 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

c_u-c_d

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

c_u

-

c_d

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.

12.60.Cn
Z': hadroproduction
Z': mass
Drell-Yan process
higher-order: 2
CERN LHC Coll
symmetry: left-right
E(6)
p p: inclusive reaction
Z': leptonic decay

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