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Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order
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| Veröffentlicht in: | Journal of high energy physics (2010,11) Artikel-Nummer 39, 29 Seiten |
|---|---|
| Personen und Körperschaften: | , |
| Titel: | Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order/ M. Bauer, F. Goertz, U. Haisch, T. Pfoh and S. Westhoff |
| Format: | E-Book-Kapitel |
| Sprache: | Englisch |
| veröffentlicht: |
10 November 2010
|
| Gesamtaufnahme: |
: Journal of high energy physics, (2010,11) Artikel-Nummer 39, 29 Seiten
, year:2010 |
| Quelle: | Verbunddaten SWB Lizenzfreie Online-Ressourcen |
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| 245 | 1 | 0 | |a Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order |c M. Bauer, F. Goertz, U. Haisch, T. Pfoh and S. Westhoff |
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| 520 | |a We calculate the tt¯tt¯ t\overline t forward-backward asymmetry, AtFB, 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 AtFB 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. | ||
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| author | Bauer, Martin, Westhoff, Susanne |
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| contents | We calculate the tt¯tt¯ t\overline t forward-backward asymmetry, AtFB, 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 AtFB 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. |
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| spelling | Bauer, Martin 1982- VerfasserIn (DE-588)1028666586 (DE-627)732052734 (DE-576)376195614 aut, Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order M. Bauer, F. Goertz, U. Haisch, T. Pfoh and S. Westhoff, 10 November 2010, 29, Text txt rdacontent, Computermedien c rdamedia, Online-Ressource cr rdacarrier, Gesehen am 21.11.2017, We calculate the tt¯tt¯ t\overline t forward-backward asymmetry, AtFB, 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 AtFB 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., Westhoff, Susanne 1982- VerfasserIn (DE-588)139819002 (DE-627)613787226 (DE-576)313206732 aut, Enthalten in Journal of high energy physics Berlin : Springer, 1997 (2010,11) Artikel-Nummer 39, 29 Seiten Online-Ressource (DE-627)320910571 (DE-600)2027350-2 (DE-576)095428305 1029-8479 nnns, year:2010 number:11 extent:29, http://dx.doi.org/10.1007/JHEP11(2010)039 Verlag Resolving-System kostenfrei Volltext, https://link.springer.com/article/10.1007/JHEP11(2010)039 Verlag kostenfrei Volltext, http://dx.doi.org/10.1007/JHEP11(2010)039 LFER, LFER 2017-12-07T00:00:00Z |
| spellingShingle | Bauer, Martin, Westhoff, Susanne, Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order, We calculate the tt¯tt¯ t\overline t forward-backward asymmetry, AtFB, 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 AtFB 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. |
| swb_id_str | 495552917 |
| title | Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order |
| title_auth | Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order |
| title_full | Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order M. Bauer, F. Goertz, U. Haisch, T. Pfoh and S. Westhoff |
| title_fullStr | Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order M. Bauer, F. Goertz, U. Haisch, T. Pfoh and S. Westhoff |
| title_full_unstemmed | Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order M. Bauer, F. Goertz, U. Haisch, T. Pfoh and S. Westhoff |
| title_in_hierarchy | Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order / M. Bauer, F. Goertz, U. Haisch, T. Pfoh and S. Westhoff, |
| title_short | Top-quark forward-backward asymmetry in Randall-Sundrum models beyond the leading order |
| title_sort | top quark forward backward asymmetry in randall sundrum models beyond the leading order |
| url | http://dx.doi.org/10.1007/JHEP11(2010)039, https://link.springer.com/article/10.1007/JHEP11(2010)039 |