CHOブログ：HEP archive

http://arxiv.org/abs/hep-ph/0703262

Probing RS scenarios of flavour at LHC via leptonic channels
Authors: F. Ledroit, G. Moreau, J. Morel

(Submitted on 23 Mar 2007)

Abstract: We study a purely leptonic signature of the Randall-Sundrum scenario with Standard Model fields in the bulk at LHC: the contribution from the exchange of Kaluza-Klein (KK) excitations of gauge bosons to the clear Drell-Yan reaction. We show that this contribution is detectable (even with the low luminosities of the LHC initial regime) for KK masses around the TeV scale and for sufficiently large lepton couplings to KK gauge bosons. Such large couplings can be compatible with ElectroWeak precision data on the Zff coupling in the framework of the custodial O(3) symmetry recently proposed, for specific configurations of lepton localizations (along the extra dimension). These configurations can simultaneously reproduce the correct lepton masses, while generating acceptably small Flavour Changing Neutral Current (FCNC) effects. This LHC phenomenological analysis is realistic in the sense that it is based on fermion localizations which reproduce all the quark/lepton masses plus mixing angles and respect FCNC constraints in both the hadron and lepton sectors.
Comments: 15 pages, 6 Figures, Latex file
Subjects: High Energy Physics - Phenomenology (hep-ph)
Report number: LPT-07-15 ; LPSC-07-26
Cite as: arXiv:hep-ph/0703262v1

Electroweak observables in a general 5D background

Authors: Antonio Delgado, Adam Falkowski
(Submitted on 22 Feb 2007 (v1), last revised 28 May 2007 (this version, v3))

Abstract: Warped extra dimensions provide a new playground to study electroweak brea-king and the nature of the higgs field. In this paper we reanalyze the electroweak observables in theories with one extra dimension and a completely general warp factor. We demonstrate that, regardless of the 5D background, SU(2)_R is needed in order to avoid excessive contributions to the T parameter. For higgsless theories cancelations between different contributions to the S parameter are needed.

Comments: latex2e, 20 pages, typos corrected, references added, version to be published in JHEP
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:hep-ph/0702234v3

Strong tree level unitarity violations in the extra dimensional standard model with scalars in the bulk.
Stefania De Curtis, Daniele Dominici (INFN, Florence & Florence U.) , Jose R. Pelaez (Florence U. & INFN, Florence & Madrid U.) .
Published in Phys.Rev.D67:076010,2003.
e-Print Archive: hep-ph/0301059
http://arxiv.org/abs/hep-ph/0301059

Bounds on universal extra dimensions
Thomas Appelquist (Yale U.) , Hsin-Chia Cheng (Chicago U., EFI) , Bogdan A. Dobrescu (Yale U.) .
Published in Phys.Rev.D64:035002,2001.
e-Print Archive: hep-ph/0012100
http://arxiv.org/abs/hep-ph/0012100

Virtual graviton exchanges at the Z pole in large extra dimensions
Anindya Datta, Emidio Gabrielli (Helsinki Inst. of Phys.) , Barbara Mele (INFN, Rome & Rome U.) .
Published in Phys.Lett.B552:237-246,2003.
e-Print Archive: hep-ph/0210318
http://arxiv.org/abs/hep-ph/0210318

Graviscalars from higher dimensional metrics and curvature Higgs mixing
Gian F. Giudice (CERN) , Riccardo Rattazzi (INFN, Pisa & Pisa, Scuola Normale Superiore) , James D. Wells (UC, Davis & LBL, Berkeley) .
Published in Nucl.Phys.B595:250-276,2001.
e-Print Archive: hep-ph/0002178
http://arxiv.org/abs/hep-ph/0002178

Radion effects on unitarity in gauge boson scattering
Tao Han, Graham D. Kribs, Bob McElrath (Wisconsin U., Madison) . Published in Phys.Rev.D64:076003,2001.
e-Print Archive: hep-ph/0104074
http://arxiv.org/abs/hep-ph/0104074

On Kaluza-Klein states from large extra dimensions
Tao Han (Wisconsin U., Madison) , Joseph D. Lykken (Fermilab) , Ren-Jie Zhang (Wisconsin U., Madison) .
Published in Phys.Rev.D59:105006,1999.
e-Print Archive: hep-ph/9811350
http://arxiv.org/abs/hep-ph/9811350

Running and matching from five-dimensions to four-dimensions.
R. Contino, L. Pilo (Pisa, Scuola Normale Superiore) , R. Rattazzi (CERN) , Enrico Trincherini (Pisa U. & INFN, Pisa) .
Published in Nucl.Phys.B622:227-239,2002.
e-Print Archive: hep-ph/0108102
http://arxiv.org/abs/hep-ph/0108102

Gauge unification in higher dimensions.
Lawrence J. Hall, Yasunori Nomura (LBL, Berkeley & UC, Berkeley) .
Published in Phys.Rev.D64:055003,2001.
e-Print Archive: hep-ph/0103125
http://arxiv.org/abs/hep-ph/0103125