CHOブログ：HEP archive

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Experiments

http://arxiv.org/abs/0705.0164

Inflationary Cosmology

Authors: Andrei Linde
(Submitted on 2 May 2007 (v1), last revised 16 May 2007 (this version, v2))

Abstract: I give a general review of the history of inflationary cosmology and of its present status.
Comments: 60 pages, 10 figs, based on a talk given at the 22nd IAP Colloquium, "Inflation+25", Paris, June 2006
Subjects: High Energy Physics - Theory (hep-th); Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:0705.0164v2 [hep-th]

http://arxiv.org/abs/0704.2276

Physics Beyond the Standard Model and Dark Matter

Authors: Hitoshi Murayama
(Submitted on 18 Apr 2007)

Abstract: In this lecture note, I discuss why many of us are expecting rich physics at the TeV scale, drawing analogies from the history of physics in the last century. Then I review some of the possible candidates of new physics at this energy scale. I also discuss why we believe much of the matter in the universe is not atoms (baryons) or compact astronomical objects, and hence requires physics beyond the standard model. Finally I discuss some of the candidates for the non-baryonic dark matter.

Comments: Lectures at Les Houches Summer School, Session 86, Particle Physics and Cosmology: the Fabric of Spacetime, July 31- August 25, 2006
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:0704.2276v1 [hep-ph]

http://arxiv.org/abs/0704.2232

Spontaneous Symmetry Breaking as a Basis of Particle Mass

Authors: Chris Quigg
(Submitted on 17 Apr 2007 (v1), last revised 28 May 2007 (this version, v2))

Abstract: Electroweak theory joins electromagnetism with the weak force in a single quantum field theory, ascribing the two fundamental interactions--so different in their manifestations--to a common symmetry principle. How the electroweak gauge symmetry is hidden is one of the most urgent and challenging questions facing particle physics. The provisional answer incorporated in the "standard model" of particle physics was formulated in the 1960s by Higgs, by Brout & Englert, and by Guralnik, Hagen & Kibble: The agent of electroweak symmetry breaking is an elementary scalar field whose self-interactions select a vacuum state in which the full electroweak symmetry is hidden, leaving a residual phase symmetry of electromagnetism. By analogy with the Meissner effect of the superconducting phase transition, the Higgs mechanism, as it is commonly known, confers masses on the weak force carriers W and Z. It also opens the door to masses for the quarks and leptons, and shapes the world around us. It is a good story--though an incomplete story--and we do not know how much of the story is true. Experiments that explore the Fermi scale (the energy regime around 1 TeV) during the next decade will put the electroweak theory to decisive test, and may uncover new elements needed to construct a more satisfying completion of the electroweak theory. The aim of this article is to set the stage by reporting what we know and what we need to know, and to set some "Big Questions" that will guide our explorations.

Comments: 43 pages, 18 figures, uses IOP macros (included); two typos corrected
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Report number: FERMILAB-PUB-07/030-T
Cite as: arXiv:0704.2232v2 [hep-ph]

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

A T-odd observable sensitive to CP violating phases in squark decay

Authors: Paul Langacker, Gil Paz, Lian-Tao Wang, Itay Yavin
(Submitted on 6 Feb 2007)

Abstract: We present a new observable sensitive to a certain combination of CP violating phases in supersymmetric extensions of the Standard Model, viz. a triple product of momenta in the cascade decay of a heavy squark via an on-shell neutralino and off-shell slepton. We investigate the regions of parameter space in which the signal is strong enough to be detectable at the LHC with $\sim \bigl(10^2-10^3\bigr)/\sin^2(2\Delta\phi)$ identified events, where $\Delta\phi$ is a certain combination of phases in the MSSM presented in the text.

http://arxiv.org/abs/hep-ph/0702061

Recent Developments in Neutrino Phenomenology
Authors: A. Yu. Smirnov
(Submitted on 5 Feb 2007)

Abstract: The first phase of studies of the neutrino mass and mixing is essentially over. The outcome is the discovery of non-zero neutrino mass and determination of the dominant structure of the lepton mixing matrix. In some sense this phase was very simple, and nature was very collaborative with us: Two main effects - the vacuum oscillations and the adiabatic conversion in matter (the MSW-effect) - provide complete interpretation of the experimental results. Furthermore, with the present accuracy of measurements the $3\nu-$mixing analysis is essentially reduced to the $2\nu$ consideration. I will present a concise and comprehensive description of this first phase. The topics include: (i) the concept of neutrino mixing in vacuum and matter; (ii) physics of the oscillations and adiabatic conversion; (iii) the experimental evidences of the flavor transformations and determination of the oscillation parameters. Some implications of the obtained results are discussed. Comments are given on the next phase of the field that will be much more involved.

arXiv:0706.0684
Date: Tue, 5 Jun 2007 15:15:37 GMT (124kb)

Title: Ten Lectures on the ElectroWeak Interactions
Authors: Riccardo Barbieri
Categories: hep-ph
Comments: 63 pages
\\
Elementary particle physics is the quadrant of nature whose laws can be written in a few lines with absolute precision and the greatest empirical adequacy. If this is the case, as I believe it is, it must be possible and is probably useful to introduce the students and the interested readers to the entire subject in a compact way. This is the main aim of these Lectures.

http://arxiv.org/abs/0706.0684

Physics impact of ILC Higgs coupling measurements: the effect of theory uncertainties

Andrew Droll, Heather E. Logan

http://arxiv.org/abs/hep-ph/0612317