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Languages : en
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Between 1992 and 1995, the CDF and D0 collaborations collected data from p{anti p} collisions at (square root)s = 1.8 TeV. Recently, several analyses of this data have been performed in search of evidence for various non-Supersymmetric exotic particles. As no evidence for the existence of these particles is observed, confidence level limits are established for exotic particle predictions from various theoretical models. Analyses presented here include searches for Standard Model Higgs, technicolor particles, topcolor-assissted technicolor bosons, and flavor-universal colorons.
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Languages : en
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Book Description
Between 1992 and 1995, the CDF and D0 collaborations collected data from p{anti p} collisions at (square root)s = 1.8 TeV. Recently, several analyses of this data have been performed in search of evidence for various non-Supersymmetric exotic particles. As no evidence for the existence of these particles is observed, confidence level limits are established for exotic particle predictions from various theoretical models. Analyses presented here include searches for Standard Model Higgs, technicolor particles, topcolor-assissted technicolor bosons, and flavor-universal colorons.
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Languages : en
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Searches for new particles have been conducted at the Tevatron using data from the 1992{ 1996 data sets. Brief descriptions of searches for vector leptoquarks, Dirac monopoles and technicolor particles are presented here.
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Languages : en
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We report on selected recent results from the CDF and D0 experiments on searches for physics beyond the Standard Model using data from the Tevatron collider running p{bar p} collisions at √s = 1960 GeV. Over the past decades the Standard Model (SM) of particle physics has been surprisingly successful. Although the precision of experimental tests improved by orders of magnitude no significant deviation from the SM predictions has been observed so far. Still, there are many questions that the Standard Model does not answer and problems it can not solve. Among the most important ones are the origin of the electro-weak symmetry breaking, hierarchy of scales, unification of fundamental forces and the nature of gravity. Recent cosmological observations indicates that the SM particles only account for 4% of the matter of the Universe. Many extensions of the SM (Beyond the Standard Model, BSM) have been proposed to make the theory more complete and solve some of the above puzzles. Some of these extension includes SuperSymmetry (SUSY), Grand Unification Theory (GUT) and Extra Dimensions. At CDF and D0 we search for evidence of such processes in proton-antiproton collisions at √(s) = 1960 GeV. The phenomenology of these models is very rich, although the cross sections for most of these exotic processes is often very small compared to those of SM processes at hadron colliders. It is then necessary to devise analysis strategies that would allow to disentangle the small interesting signals, often buried under heavy instrumental and/or physics background. Two main approaches to search for physics beyond the Standard Model are used in a complementary fashion: model-based analyses and signature based studies. In the more traditional model-driven approach, one picks a favorite theoretical model and/or a process, and the best signature is chosen. The selection cuts are optimized based on acceptance studies performed using simulated signal events. The expected background is calculated from data and/or Monte Carlo and, based on the number of events observed in the data, a discovery is made or the best limit on the new signal is set. In a signature-based approach a specific signature is picked (i.e. dileptons+X) and the data sample is defined in terms of known SM processes. A signal region (blind box) might be defined with cuts which are kept as loose as possible and the background predictions in the signal region are often extrapolated from control regions. Inconsistencies with the SM predictions will provide indication of possible new physics. As the cuts and acceptances are often calculated independently from a model, different models can be tested against the data sample. It should be noticed that the comparison with a specific model implies calculating optimized acceptances for a specific BSM signal. In signature-based searches, there is no such an optimization. Both the experiments have followed a somehow natural approach in pursuing analysis looking at final state signatures characterized by relatively simple physics objects (for example lepton-only final state, where the selection of the leptons is straightforward and can be easily checked with the measurement of electroweak boson production cross sections) and proceeding onto more complex final state, including jets and heavy flavor. Here more sophisticated identification techniques need to be used and issues like jet energy scale calibration play an important role in determining the final result. Given the limited space available for this proceeding, we will focus here on few selected results.
Author: Daniela Bortoletto
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Category :
Languages : en
Pages : 6
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An overview of recent experimental searches for SUSY particles is presented. These searches are based on data collected by the CDF and the D0 experiments operating at the Fermilab Tevatron proton-antiproton collider with {radical}s = 1.96 TeV. The review focuses on searches for squarks and gluinos in final states with missing transverse energy and jets. Emphasis will be given to the search for the gluino decaying into a sbottom and b quark with each sbottom decaying into a b quark and a neutralino. This scenario yields events containing 4 b-jets and missing transverse energy.
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Languages : en
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The Standard Model is a remarkable result of decades of work in particle physics, but it is clearly an incomplete representation of the world. Exploring possibilities beyond the Standard Model is a major preoccupation of both theorists and experimentalists. Despite the many suggestions that are extant about the missing links within the Standard Model as well as extensions beyond it, no hard experimental evidence exists. In particular, in more than five years of experimentation both at PETRA and PEP no new particles have been found that would indicate new physics. Several reasons are possible for these negative results: the particles may be too heavy; the experiments may not be looking in the proper way; the cross sections may be too small or finally the particles may not exist. A continuing PEP program, at high luminosity will ensure that the second and third reason continue to be addressed. The higher energy ee− storage rings such as TRISTAN and LEP will extend the mass limits. High mass particles can also be produced at the CERN collider and soon with the Tevatron collider. A concise summary of the mass limits from the PETRA experiments has been given in a recent Mark J publication. The results shown provide a convenient yardstick against which to measure future search experiments.
Author: Antonino Zichichi
Publisher: World Scientific
ISBN: 9814293245
Category : Science
Languages : en
Pages : 511
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Book Description
Beyond Higgs / W.A. Bardeen -- Is N = 8 supergravity ultraviolet finite? / Z. Bern -- Extremal black holes and attractors / S. Ferrara -- Exotic mesons / L. Maiani -- The entropic principle and the landscape in SUSY gauge theories / H. Ooguri -- Warped dimensions / L. Randall -- Unitarity in the Brout-Englert-Higgs mechanism for gravity / C. 'tHooft -- AdS/CFT and light-front QCD / S.J. Brodsky -- Physics of the light quarks / H. Leutwyler -- BFKL equation and anomalous dimensions in N = 4 SUSY / L.N. Lipatov -- The color glass condensate and the glasma / L. McLerran -- Highlights from CERN / R. Aymar -- Highlights from Gran Sasso / E. Coccia -- Highlights from the CNGS & OPERA / Y. Declais -- Highlights from RHIC / B. Jacak -- Highlights from fermilab / P.J. Oddone -- Problems with three neutrinos / A. Bettini -- Double beta decay / E. Fiorini -- Rare decays in the 3rd family / M. Giorgi -- Cosmology and the unexpected / E.W. Kolb -- Complexity at the fundamental level : consequences for LHC / A. Zichichi -- Vertexing and flavour tagging at the international linear collider / E. Devetak -- The standard model Higgs search at the tevatron / W. Fisher -- Effective potentials in de Sitter background and application to the MSSM / B. Garbrecht -- Tuning the vertex detector simulation of H1 / M. Kramer -- Numerical calculation of electron g-2 at 4 loops in QED / S. Laporta -- Spinors and unitarity-cuts / P. Mastrolia -- Exploring the physics frontier with v[symbol]'s and v[symbol]'s in MINOS / J.P. Ochoa-Ricoux -- Modified dispersion relations and trans-planckian physics / M. Rinaldi -- A large TPC prototype for the international linear collider / P. Schade -- Lepton flavour violation : hints on the SUSY seesaw / A.M. Teixeira -- Background simulations for the international linear collider / A. Vogel -- A hadronic calorimeter for the international linear collider / N. Wattimena
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Category :
Languages : en
Pages : 10
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Author: Antonio Ferrer
Publisher: World Scientific
ISBN: 9814546380
Category :
Languages : en
Pages : 234
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Book Description
This book collects a series of papers presented at the XXIV International Meeting on Fundamental Physics. This annual conference is devoted to reviewing current topics in the field of high energy physics. From the Tevatron to the LHC reviews the present status of experiments at large accelerators (Tevatron, LEP, LHC) and deals with selected subjects like CP violation, B physics, glueballs, neutrinos and supersymmetry.
Author: Song Ming Wang
Publisher:
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Category : Higgs bosons
Languages : en
Pages : 12
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Author: S. Bentvelsen
Publisher: Elsevier
ISBN: 0444599169
Category : Science
Languages : en
Pages : 1004
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Book Description
The first precision measurements on CP violation in the B system are reported. Both the BELLE and the BABAR collaboration presented, among others, results for sin 2ß with much improved accuracy. Results from the Sudbury Neutrino Observatory, SNO, also deserve to be mentioned. The convincing evidence of solar neutrino oscillations had been presented by SNO prior to the conference; a full presentation was given at the conference. An incredibly precise measurement of the anomalous magnetic moment of the muon is reported, a fresh result from the Brookhaven National Laboratory. Apart from these distinct physics highlights, there are also the first results from the new Tevatron run and from the relativistic heavy ion collider RHIC. Theorists write of our ever better understanding of the Standard Model and of what might lie beyond. Risky as it is to highlight only a couple of exciting subjects, it is merely meantto whet the appetite for further reading.
