Physics And Experiments With Linear Colliders: Lcws95 - Proceedings Of The Workshop (In 2 Volumes) PDF Download
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Author: Yoshiaki Fujii
Publisher: World Scientific
ISBN: 9814547719
Category :
Languages : en
Pages : 836
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Book Description
Collider experiments have become essential to studying elementary particles. In particular, lepton collisions such as e⁺e⁻ are ideal from both experimental and theoretical points of view, and are a unique means of probing the new energy region, sub-TeV to TeV. It is a common understanding that a next-generation e⁺e⁻ collider will have to be a linear machine that evades beam-energy losses due to synchrotron radiation. In this book, physics feasibilities at linear colliders are discussed in detail, taking into account the recent progress in high-energy physics.
Author: Yoshiaki Fujii
Publisher: World Scientific
ISBN: 9814547719
Category :
Languages : en
Pages : 836
Get Book Here
Book Description
Collider experiments have become essential to studying elementary particles. In particular, lepton collisions such as e⁺e⁻ are ideal from both experimental and theoretical points of view, and are a unique means of probing the new energy region, sub-TeV to TeV. It is a common understanding that a next-generation e⁺e⁻ collider will have to be a linear machine that evades beam-energy losses due to synchrotron radiation. In this book, physics feasibilities at linear colliders are discussed in detail, taking into account the recent progress in high-energy physics.
Author: Keisuke Fujii
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Book Description
Scenarios are developed for runs at a Linear Collider, in the case that there is a rich program of new physics. The physics program of the linear ee− collider LC is potentially very extensive, particularly in the case that a Higgs boson with mass below 300 GeV is found and relatively low energy scale supersymmetry (SUSY) exists. For such a case, we have examined a possible run plan for the LC to explore the new states and their masses, and estimated the precision on measured parameters that can be attained in a reasonable time span. For this study, we have examined a scenario with a light SM-like Higgs boson of mass 120 GeV and two minimal supergravity (mSUGRA) models with many low mass sparticles. This scenario is conservative; with many particles to study there are many desired operational conditions for the collider (different energies and beam polarizations). We have not assumed that positron polarization is available, again a conservative assumption from the point of view of the running time required.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
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Book Description
We discuss future ee− linear colliders and new particle searches that can be done with them. In the discussion of new particle searches we examine the following topics: searches for gauge boson structure, searches for a strongly interacting Higgs sector, top quark studies, Higgs searches, supersymmetric particle searches and measurements of soft supersymmetry breaking parameters.
Author:
Publisher:
ISBN:
Category : Nuclear physics
Languages : en
Pages : 594
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Book Description
Author: Keisuke Fujii
Publisher: World Scientific
ISBN: 9814482390
Category : Science
Languages : en
Pages : 518
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Book Description
The high energy electron-positron linear collider is expected to provide crucial clues to many of the fundamental questions of our time: What is the nature of electroweak symmetry breaking? Does a Standard Model Higgs boson exist, or does nature take the route of supersymmetry, technicolor or extra dimensions, or none of the foregoing? This invaluable book is a collection of articles written by experts on many of the most important topics which the linear collider will focus on. It is aimed primarily at graduate students but will undoubtedly be useful also to any active researcher on the physics of the next generation linear collider.
Author: Lingfeng Li
Publisher:
ISBN: 9780438291461
Category :
Languages : en
Pages :
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Book Description
The search for supersymmetry (SUSY) signals at the Large Hadronic Collider(LHC) remains one of the most exciting and important topics of collider physics. To keep the scale of the electroweak symmetry breaking (EWSB) natural, the superpartners are expected to have masses around or beneath the TeV scale. The negative results from light SUSY particle searches at the LHC make the natural SUSY scenario in tension with experiments. However, if the SUSY spectrum turns out to be compressed, where superpartners' decay products are typically soft compared to superpartners' masses, the collider constraints are much weaker. In this case the natural SUSY scenario may still work, without introducing severe fine-tuning. In this dissertation we present four related collider phenomenology studies focusing on different searches for compressed SUSY spectra. We firstly generalize the existing hadronic compressed stop searches and extend them to semileptonic final states. A kinematic variable R̄[subscript M] is introduced to keep track of the ratio of missing transverse energy (MET) induced from the neutralinos and the extra radiated jets. With the help of new variables and efforts to suppress the SM backgrounds, the method can have a better reach than fully-hadronic methods. In the second study, we use dileptonic final states as an effective channel to probe compressed SUSY spectra, even in the presence of more than one neutrinos in the final state. An event's phase space can be solved down to a one-dimensional subspace with a corresponding R̄{subscript M] distribution. The dileptonic mode turns out to be a powerful tool if the stops cascade decay through the electroweakinos and the sleptons. Thirdly, we study the compressed SUSY spectrum along the more compressed W corridor. The signal is b-jet free and the analysis can also be applied to compressed chargino searches. Last but not least, we illustrate a search of heavier third generation squarks including both stops and sbottoms, by analysing various signal channels. New techniques are employed to further improve the significance.
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ISBN:
Category :
Languages : en
Pages : 5
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Book Description
Precision measurements have played a vital role in our understanding of elementary particle physics. Experiments performed using ee− collisions have contributed an essential part. Recently, the precision measurements at LEP and SLC have probed the standard model at the quantum level and severely constrained the mass of the Higgs boson [1]. Coupled with the limits on the Higgs mass from direct searches [2], this enables the mass to be constrained to be in the range 115-205 GeV. Developments in accelerator R and D have matured to the point where one could contemplate construction of a linear collider with initial energy in the 500 GeV range and a credible upgrade path to H"1 TeV. Now is therefore the correct time to critically evaluate the case for such a facility. The Working Group E3, Experimental Approaches at Linear Colliders, was encouraged to make this evaluation. The group was charged with examining critically the physics case for a Linear Collider (LC) of energy of order 1 TeV as well as the cases for higher energy machines, assessing the performance requirements and exploring the viability of several special options. In addition it was asked to identify the critical areas where R and D is required (the complete text of the charge can be found in the Appendix). In order to address this, the group was organized into subgroups, each of which was given a specific task. Three main groups were assigned to the TeV-class Machines, Multi-TeV Machines and Detector Issues. The central activity of our working group was the exploration of TeV class machines, since they are being considered as the next major initiative in high energy physics. We have considered the physics potential of these machines, the special options that could be added to the collider after its initial running, and addressed a number of important questions. Several physics scenarios were suggested in order to benchmark the physics reach of the linear collider and persons were appointed to maintain contacts with the relevant activities in the various Physics Working Groups. Special options considered were precision electroweak studies that could be done by running the collider at and near the Z pole (so called Giga Z running); collisions involving [gamma][gamma], e−e−, or e[gamma] interactions; and positron beam polarization. The following questions were posed in order to focus the discussions: (1) In view of the fact that the luminosity is a function of energy, what are the trade-offs involved in selecting the energy. (2) What is the argument for proceeding with the construction of a Linear collider as soon as possible rather than waiting for data from LHC? (3) In the context of a definite physics scenario, what is a realistic run plan? i.e. How much luminosity at each energy? (4) What should be the initial energy of a linear collider and to what energy should that machine extended?
Author: Harris Frederick A.
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 440
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Book Description
The American particle physics community can look forward to a well-conceived and vital program of experimentation for the next ten years, using both colliders and fixed target beams to study a wide variety of pressing questions. Beyond 2010, these programs will be reaching the end of their expected lives. The CERN LHC will provide an experimental program of the first importance. But beyond the LHC, the American community needs a coherent plan. The Snowmass 2001 Workshop and the deliberations of the HEPAP subpanel offer a rare opportunity to engage the full community in planning our future for the next decade or more. A major accelerator project requires a decade from the beginning of an engineering design to the receipt of the first data. So it is now time to decide whether to begin a new accelerator project that will operate in the years soon after 2010. We believe that the world high-energy physics community needs such a project. With the great promise of discovery in physics at the next energy scale, and with the opportunity for the uncovering of profound insights, we cannot allow our field to contract to a single experimental program at a single laboratory in the world. We believe that an ee− linear collider is an excellent choice for the next major project in high-energy physics. Applying experimental techniques very different from those used at hadron colliders, an e+e− linear collider will allow us to build on the discoveries made at the Tevatron and the LHC, and to add a level of precision and clarity that will be necessary to understand the physics of the next energy scale. It is not necessary to anticipate specific results from the hadron collider programs to argue for constructing an e+e− linear collider; in any scenario that is now discussed, physics will benefit from the new information that e+e− experiments can provide.
