Paper
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Top-Quark Forward-Backward Asymmetry in Randall-Sundrum Models Beyond the Leading Order
Authors
Martin Bauer,Florian Goertz
Ulrich Haisch,Torsten Pfoh,Susanne Westhoff,Stuart Young,Terrance Quinn II,Paolo Nason,Sunil Mukhi,Vladimir Makarenko,Salahaldin Fathalla,Niklas Beisert,Alessandro Paiella,Richard Jones,Andrzej Wal,Denis Comelli,Alberto Lerda,Зинаида Чеканцева,Vladimir Kulik,Andreas Hamann,Mikjel Thorsrud,DIGAMBER PAWAR,Trevor Glasbey,John Platt,Keisuke Yano,Kunal Vyas,Kristen Smith,Lawrence Kennedy,Nenad Đurđević,Luis Emilio Cruz-Barba,Frédéric Dreyer,Dejan Matić,Milivoje Lapčević,Veljko Vlašković,Bojan Urdarević,Zoran Vuković,Zoran Jovanović,Alexandru Ciubotaru,Emilija Stanković,Jelena Vučković,Ioannis Tsinikos,Tamara Đurđić Milošević,Srđan Vladetić,Jovan Vujičić,Sveto Puríć,Milan Palević,Peter Wolfsteiner,Nina Planojević,Milan Rapajić,Slavko Đorđević,Siniša Varga,Srdjan Đorđević,Torben Gaedt,Garrett Poe,Vesna Janjić,Jasmina Bogićević,Nada Todorović,Snežana Ljubisavljević,Vladimir Obradović,Dimitrios Zoakos,Dragan Stojković,Alain Jaccard,Carolyn Dzierba,Mirjana Todorović,Krešimir Kumerički,Biljana Jovković,Marc Torrens,Benjamin Bellenie,Stefan Hoeche,Stevan Luković,Srđan Furtula,Luis Garcés-Erice,Joseph Fotsing,Digamber Porob,David Van Wie,Milica Tufegdzic,Matti Jarvinen,Susana Henriques,N/A ,Jonathan Wall,Brian Lemoff,Marie Connett,Milan Čupić,Miljan Leković,Dejan Jovanović,Bulent Basol,Gideon Wolfaardt,Christopher Herzog,Martin Köhne,David Clarke,Andre Lukas,Mukund Rangamani,Dan Andersen,José Pedro Viegas Barros,Kim Landsbergen,Olli Pitkänen,CHIA-HO LIN,Mercedes Medina,Sebastian Linß,Sarah Kraak,Bruno Dufour,Omar Diego Lopez,Eran Palti,Nathaniel Butlin,Isabel María del Águila Cano,Sebastian Rosenbaum,Rafael Maestre,Michele Cicoli,Ingo Jordan,Luiz Agostinho Ferreira,Ivonne Zavala,Grigoris Panotopoulos,ALESSANDRO BROGGIO,Michael Taylor,Mark Begbie,Diosvany Ortega González,Yukiyoshi Okauchi,Gregory Carven,Stepan Jenicek,Suprabh Prakash,Leopoldo Pando Zayas,Yue-Lin Sming Tsai,Stuart Haigh,Nico Callewaert,Francesco Riva,Robert LoGalbo,Kevin O'Hara,Marinei Lopes Pedralli,Rong-Chi ,Stephane Coulombe,Brian Palik,Alexander Monin,Bruce Bassett,Gert Aarts,Hongzhi Luo,Rafel Escribano,Renee Hlozek,Louis Strigari,Jose Rubo,Gautam ,J. 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arXiv:1008.0742v2 [hep-ph] 10 Nov 2010
MZ-TH/10-28
Top-Quark Forward-Backward Asymmetry in
Randall-Sundrum Models Beyond the Leading Order
M. Bauer, F. Goertz, U. Haisch, T. Pfoh and S. Westhoff
Institut f¨ur Physik (THEP), Johannes Gutenberg-Universit¨at
D-55099 Mainz, Germany
Abstract
We calculate the t¯t forward-backward asymmetry, At
FB, in Randall-Sundrum (RS) models
taking into account the dominant next-to-leading order (NLO) corrections in QCD. At
Born level we include the exchange of Kaluza-Klein (KK) gluons and photons, the Z
boson and its KK excitations, as well as the Higgs boson, whereas beyond the leading
order (LO) we consider the interference of tree-level KK-gluon exchange with one-loop
QCD box diagrams and the corresponding bremsstrahlungs corrections. We find that
the strong suppression of LO effects, that arises due to the elementary nature and the
mostly vector-like couplings of light quarks, is lifted at NLO after paying the price of an
additional factor of αs/(4π). In spite of this enhancement, the resulting RS corrections
in At
FB remain marginal, leaving the predicted asymmetry SM-like. As our arguments
are solely based on the smallness of the axial-vector couplings of light quarks to the
strong sector, our findings are model-independent and apply to many scenarios of new
physics that address the flavor problem via geometrical sequestering.
MZ-TH/10-28
Top-Quark Forward-Backward Asymmetry in
Randall-Sundrum Models Beyond the Leading Order
M. Bauer, F. Goertz, U. Haisch, T. Pfoh and S. Westhoff
Institut f¨ur Physik (THEP), Johannes Gutenberg-Universit¨at
D-55099 Mainz, Germany
Abstract
We calculate the t¯t forward-backward asymmetry, At
FB, in Randall-Sundrum (RS) models
taking into account the dominant next-to-leading order (NLO) corrections in QCD. At
Born level we include the exchange of Kaluza-Klein (KK) gluons and photons, the Z
boson and its KK excitations, as well as the Higgs boson, whereas beyond the leading
order (LO) we consider the interference of tree-level KK-gluon exchange with one-loop
QCD box diagrams and the corresponding bremsstrahlungs corrections. We find that
the strong suppression of LO effects, that arises due to the elementary nature and the
mostly vector-like couplings of light quarks, is lifted at NLO after paying the price of an
additional factor of αs/(4π). In spite of this enhancement, the resulting RS corrections
in At
FB remain marginal, leaving the predicted asymmetry SM-like. As our arguments
are solely based on the smallness of the axial-vector couplings of light quarks to the
strong sector, our findings are model-independent and apply to many scenarios of new
physics that address the flavor problem via geometrical sequestering.
Contents
1 Introduction 1
2 Top-Antitop Production in the SM 4
3 Cross Section and Asymmetry in RS Models 6
3.1 Calculation of LO Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Calculation of NLO Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Numerical Analysis 14
5 Conclusions and Outlook 19
A Higgs-Boson Phase-Space Factors 21
B Wilson Coefficients in the ZMA 21
C RG Evolution of the Wilson Coefficients 23
D Parameter Points 23
1 Introduction
The top quark is the heaviest particle in the Standard Model (SM) of particle physics. Its
large mass suggests that it might be deeply connected to the mechanism driving electroweak
symmetry breaking. Detailed experimental studies of the top-quark properties are thus likely
to play a key role in unravelling the origin of mass, making top-quark observables one of
the cornerstones of the Fermilab Tevatron and CERN Large Hadron Collider (LHC) physics
programmes.
Up to now, the CDF and DØ experiments at the Tevatron have collected thousands of
top-quark pair events, which allowed them to measure the top-quark mass, mt, and its total
inclusive cross section, σt¯t, with an accuracy of below 1% [1] and 10% [2, 3], respectively.
While these measurements are important in their own right, from the point of view of searches
for physics beyond the SM, determinations of kinematic distributions and charge asymmetries
in t¯t production are more interesting, since these observables are particularly sensitive to
non-standard dynamics. Such searches have been performed at the Tevatron [4, 5, 6], and a
result for the t¯t invariant mass spectrum, dσt¯t/dMt¯t, has been recently obtained from data
collected at CDF [7, 8]. The forward-backward asymmetry, At
FB, has also been measured
[9, 10, 11, 12, 13] and constantly found to be larger than expected. In the laboratory (p¯p)
frame the most recent CDF result reads
(At
FB
)p¯p
exp = (15.0 ± 5.0 stat. ± 2.4 syst.) % , (1)
1
1 Introduction 1
2 Top-Antitop Production in the SM 4
3 Cross Section and Asymmetry in RS Models 6
3.1 Calculation of LO Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Calculation of NLO Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Numerical Analysis 14
5 Conclusions and Outlook 19
A Higgs-Boson Phase-Space Factors 21
B Wilson Coefficients in the ZMA 21
C RG Evolution of the Wilson Coefficients 23
D Parameter Points 23
1 Introduction
The top quark is the heaviest particle in the Standard Model (SM) of particle physics. Its
large mass suggests that it might be deeply connected to the mechanism driving electroweak
symmetry breaking. Detailed experimental studies of the top-quark properties are thus likely
to play a key role in unravelling the origin of mass, making top-quark observables one of
the cornerstones of the Fermilab Tevatron and CERN Large Hadron Collider (LHC) physics
programmes.
Up to now, the CDF and DØ experiments at the Tevatron have collected thousands of
top-quark pair events, which allowed them to measure the top-quark mass, mt, and its total
inclusive cross section, σt¯t, with an accuracy of below 1% [1] and 10% [2, 3], respectively.
While these measurements are important in their own right, from the point of view of searches
for physics beyond the SM, determinations of kinematic distributions and charge asymmetries
in t¯t production are more interesting, since these observables are particularly sensitive to
non-standard dynamics. Such searches have been performed at the Tevatron [4, 5, 6], and a
result for the t¯t invariant mass spectrum, dσt¯t/dMt¯t, has been recently obtained from data
collected at CDF [7, 8]. The forward-backward asymmetry, At
FB, has also been measured
[9, 10, 11, 12, 13] and constantly found to be larger than expected. In the laboratory (p¯p)
frame the most recent CDF result reads
(At
FB
)p¯p
exp = (15.0 ± 5.0 stat. ± 2.4 syst.) % , (1)
1
100%
