A standard file format is proposed to store process and event information, primarily output from parton-level event generators for further use by general-purpose ones. The information content is ...identical with what was already defined by the Les Houches Accord five years ago, but then in terms of Fortran commonblocks. This information is embedded in a minimal XML-style structure, for clarity and to simplify parsing.
We present the complete set of Feynman rules producing the rational terms of kind R
2
needed to perform any 1-loop calculation in the Electroweak Standard Model. Our formulae are given both in the
R
...ξ
gauge and in the Unitary gauge, therefore completing the results in the ’t Hooft-Feynman gauge already presented in a previous publication.
As a consistency check, we verified, in the case of the process
H
→ γγ and in a few other physical cases, the independence of the total Rational Part (R
1
+R
2
) on the chosen gauge. In addition, we explicitly checked the equivalence of the limits ξ→∞ after or before the loop momentum integration in the definition of the Unitary gauge at 1-loop.
We present the complete set of Feynman rules producing the rational terms of kind R
2
needed to perform any 1-loop calculation in the Electroweak Standard Model. Our results are given both in the ’t ...Hooft-Veltman and in the Four Dimensional Helicity regularization schemes. We also verified, by using both the ’t Hooft-Feynman gauge and the Background Field Method, a huge set of Ward identities -up to 4-points- for the complete rational part of the Electroweak amplitudes. This provides a stringent check of our results and, as a by-product, an explicit test of the gauge invariance of the Four Dimensional Helicity regularization scheme in the complete Standard Model at 1-loop. The formulae presented in this paper provide the last missing piece for completely automatizing, in the framework of the OPP method, and in any other approach using 4-dimensional numerators, the 1-loop calculations in the SU(3) × SU(2) × U(1) Standard Model.
We present an update of the Binoth Les Houches Accord (BLHA) to standardise the interface between Monte Carlo programs and codes providing one-loop matrix elements.
We discuss the physics potential and the experimental challenges of an upgraded LHC running at an instantaneous luminosity of 1035 cm-2s-1. The detector R&D needed to operate ATLAS and CMS in a very ...high radiation environment and the expected detector performance are discussed. A few examples of the increased physics potential are given, ranging from precise measurements within the Standard Model (in particular in the Higgs sector) to the discovery reach for several New Physics processes.
Many highly developed Monte Carlo tools for the evaluation of cross sections based on tree matrix elements exist and are used by experimental collaborations in high energy physics. As the evaluation ...of one-loop matrix elements has recently been undergoing enormous progress, the combination of one-loop matrix elements with existing Monte Carlo tools is on the horizon. This would lead to phenomenological predictions at the next-to-leading order level. This note summarises the discussion of the next-to-leading order multi-leg (NLM) working group on this issue which has been taking place during the workshop on Physics at TeV Colliders at Les Houches, France, in June 2009. The result is a proposal for a standard interface between Monte Carlo tools and one-loop matrix element programs.
Dedicated to the memory of, and in tribute to, Thomas Binoth, who led the effort to develop this proposal for Les Houches 2009. Thomas led the discussions, set up the subgroups, collected the contributions, and wrote and edited this paper. He made a promise that the paper would be on the arXiv the first week of January, and we are faithfully fulfilling his promise. In his honour, we would like to call this the Binoth Les Houches Accord.
At the Large Hadron Collider, we prove the feasibility to detect pair production of the lightest CP -even Higgs boson
h
of a Type II 2-Higgs Doublet Model through the process
(Higgs-strahlung,
V
=
W
...±
,Z
), in presence of two
decays. We also show that, through such production and decay channels, one has direct access to the following Higgs self-couplings, thus enabling one to distinguish between a standard and the Supersymmetric version of the above model: λ
Hhh
— which constrains the form of the Higgs potential — as well as λ
W
±
H
∓
h
and λ
Z Ah
— which are required by gauge invariance. Unfortunately, such claims cannot be extended to the Minimal Supersymmetric Standard Model, where the extraction of the same signals is impossible.
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