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A Les Houches Interface for BSM Generators

Description: We propose to combine and slightly extend two existing 'Les Houches Accords' to provide a simple generic interface between beyond-the-standard-model parton-level and event-level generators. All relevant information--particle content, quantum numbers of new states, masses, cross sections, parton-level events, etc.--is collected in one single file, which adheres to the Les Houches Event File (LHEF) standard.
Date: December 1, 2007
Creator: Alwall, J.; Boos, E.; Dudko, L.; Gigg, M.; Herquet, M.; Pukhov, A. et al.
Partner: UNT Libraries Government Documents Department

A Les Houches Interface for BSM Generators

Description: We propose to combine and slightly extend two existing 'Les Houches Accords' to provide a simple generic interface between beyond-the-standard-model parton-level and event-level generators. All relevant information--particle content, quantum numbers of new states, masses, cross sections, parton-level events, etc.--is collected in one single file, which adheres to the Les Houches Event File (LHEF) standard.
Date: January 23, 2008
Creator: Alwall, J.; Boos, E.; Dudko, L.; Gigg, M.; Herquet, M.; Pukhov, A. et al.
Partner: UNT Libraries Government Documents Department

INTERACTIONS OF 200-GeV/c PROTONS WITH EMULSION NUCLEI, CHARGED PARTICLE MULTIPLICITIES

Description: The experimental data on the multiplicity distributions for various kinds of secondaries produced in the proton-nucleus interactions in emulsion at 200 GeV/c and the correlations between them are presented and discussed. All the characteristics of heavy prongs (mean values <n{sub b}>, <n{sub g}>, <N{sub h}>, their distributions and correlations) are independent (or have a very weak dependence) on the collisions energy in the range 20-200 GeV/c. The data contradict to the cascade-evaporation model and qualitatively agree with the mechanism of particle emission via the long-lived intermediate states. The observed weak A-dependence ({approx} A{sup 0.15}) of shower particle distributions is in agreement with the calculated ones according to the simplified two-step model. It is shown that the n{sub s}-distributions agree well with KNO scaling law in the 67-200 GeV/c range, but the form of universal {psi}(n{sub s/n{sub s}})-function has a weak A-dependence.
Date: January 1, 1974
Creator: Anzon, Z.V.; Boos, E.G.; Chasnikov, I.Ya.; Kanygina, E.K.; Khomenko, K.I.; Pavlova, N.P. et al.
Partner: UNT Libraries Government Documents Department

The Multiplicity in Fragmentation and Pionisation Regions in p p Interactions at 200-GeV/c

Description: Two BR-2 emulsion stacks 20cm x 10cm x 100 x 0,06 cm in size were irradiated by 200 Gev/c protons at the NAL accelerator in Batavia (US). The scanning along the track was performed. They observed 9339 inelastic interactions on the track length of 3303 m of primary protons.
Date: January 1, 1974
Creator: Antonova, M.G.; Boos, E.G.; Goryachikh, A.A.; Chasnikov, I.Ya.; Loktionov, A.A.; Morozova, P.V. et al.
Partner: UNT Libraries Government Documents Department

Multiplicity of Charged Secondaries in Interactions of Protons in an Emulsion at 400-GeV/c

Description: The preliminary results on multiplicities of charged secondaries in proton-nucleus interactions at 400 Gev/c are presented. Multiplicity of produced particles is consistent in the first approximation with the KNO scaling hypothesis for hadron-nucleus interactions. The relations between different moments of multiplicity distribution in proton-nucleons interactions at high energies are discussed too.
Date: January 1, 1977
Creator: Boos, E.G.; Borisenko, A.I.; Kazanskaya, A.N.; Morozova, P.V.; Pavlova, N.P.; Kholmetskaya, A.V. et al.
Partner: UNT Libraries Government Documents Department

Coherent Production of Charged Particles on Nuclei by 400-GeV/c Protons

Description: Topological cross sections {delta}{sub coh}{sup (n)} (n = 1,3,5 and 7) of coherent diffractive dissociation of 400 Gev/c protons on nuclei of photoemulsion elements have been measured. Topological cross sections increase in the energy range from 20 to 400 Gev/c. This growth is the most noticeable for multiprong topologies. The total cross section of diffractive coherent production also increases from 8 to 25 mb/nucleus in this energy range. The increasing of the average multiplicity of charged particles in reaction of coherent proton dissociates is consistent with the logarithmic law <n>{sub coh} = (90.25 {+-} 0.05) inp. + (1.3 {+-} 0.25).
Date: January 1, 1977
Creator: Boos, E.G.; Borisenko, A.I.; Kazanskaya, A.N.; Morozova, P.V.; Pavlova, N.P.; Kholmetskaya, A.V. et al.
Partner: UNT Libraries Government Documents Department

Coherent Production of Particles by Protons at 200-GeV/c on Emulsion Nuclei

Description: The coherent diffraction production process is characterized by a very narrow angular distribution of secondary particles that is caused by a small 4-momentum transferred to the nuclei. Besides, they have neither excitation of nuclei, nor disintegration. The quantum numbers of the coherently produced system are the same as those of the incident particle. For proton coherent interactions the number of charged particles must be odd. In this work are presented the data about a cross section for production of three, five and seven charged particles at 200 Gev/c, the energy dependence of these cross sections as angular characteristics of the secondary particles in coherent reactions.
Date: January 1, 1974
Creator: Antonova, M.G.; Boos, E.G.; Goryachikh, A.A.; Chasnikov, I.Ya.; Loktionov, A.A.; Obodova, R. et al.
Partner: UNT Libraries Government Documents Department

Proton - Nucleus Interactions at 200-GeV/c

Description: The investigation of interactions of hadrons with the nucleus in recent time became very important, and there is a hope that it can give the information about the systems produced in this process (lifetime, cross sections etc.) The nuclear photoemulsions are a good detector at the investigation of hadron-nucleus interactions due to a high spatial resolution and a possibility of detection of particles nearly at all energies that enables to study the characteristics of both fast and slow particles. The consistence of emulsion enables to obtain the characteristics of interactions both on light (CNO, <A> = 14) and on heavy(Ag,Br,<A> = 94) nuclei.
Date: January 1, 1974
Creator: Anzon, Z.V.; Boos, E.G.; Goryachikh, A.A.; Chasnikov, I.Ya.; Loktionov, A.A.; Morozova, P.V. et al.
Partner: UNT Libraries Government Documents Department

New Physics at the LHC: A Les Houches Report. Physics at Tev Colliders 2007 - New Physics Working Group

Description: We present a collection of signatures for physics beyond the standard model that need to be explored at the LHC. The signatures are organized according to the experimental objects that appear in the final state, and in particular the number of high p{sub T} leptons. Our report, which includes brief experimental and theoretical reviews as well as original results, summarizes the activities of the 'New Physics' working group for the 'Physics at TeV Colliders' workshop (Les Houches, France, 11-29 June, 2007).
Date: December 5, 2011
Creator: Brooijmans, Gustaaf H.; Delgado, A.; Dobrescu, Bogdan A.; Grojean, C.; Narain, Meenakshi; Alwall, Johan et al.
Partner: UNT Libraries Government Documents Department

A Standard format for Les Houches event files

Description: 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.
Date: September 1, 2006
Creator: Alwall, J.; Ballestrero, A.; Bartalini, P.; Belov, S.; Boos, E.; Buckley, A. et al.
Partner: UNT Libraries Government Documents Department

Supersymmetry Parameter Analysis: SPA Convention andProject

Description: High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when higher-order corrections are included. We propose such a scheme, Supersymmetry Parameter Analysis SPA, based on a consistent set of conventions and input parameters. A repository for computer programs is provided which connect parameters in different schemes and relate the Lagrangian parameters to physical observables at LHC and high energy e{sup +}e{sup -} linear collider experiments, i.e., masses, mixings, decay widths and production cross sections for supersymmetric particles. In addition, programs for calculating high-precision low energy observables, the density of cold dark matter (CDM) in the universe as well as the cross sections for CDM search experiments are included. The SPA scheme still requires extended efforts on both the theoretical and experimental side before data can be evaluated in the future at the level of the desired precision. We take here an initial step of testing the SPA scheme by applying the techniques involved to a specific supersymmetry reference point.
Date: December 2, 2005
Creator: Aguilar-Saavedra, J.A.; Ali, A.; Allanach, B.C.; Arnowitt, R.; Baer, H.A.; Bagger, J.A. et al.
Partner: UNT Libraries Government Documents Department