Download or read book Increased Sensitivity for Asymmetry Measurements at Linear Colliders with Polarized Electron and Positron Beams written by Klaus Flöttmann and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book More Transverse Polarization Signatures of Extra Dimensions at Linear Colliders written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Polarization of both electron and positron beams at a future linear collider (LC) allows for the measurement of transverse polarization asymmetries. These asymmetries have been shown to be particularly sensitive to graviton or other spin-2, s-channel exchanges in the process e[sup+]e[sup -][yields] f[bar f] (F[ne] e) which allows for a doubling of the usual search reach. A question then arises as to whether other e[sup+]e[sup -] processes also show comparable sensitivity. Here we extend our previous analysis to the set of final states e[sup+]e[sup -], W[sup+]W[sup -], 2[gamma] and 2Z as well as to the Moeller scattering process e[sup -]e[sup -]. We demonstrate that these reactions yield transverse polarization asymmetries which are somewhat less sensitive to graviton exchange than are those obtained in our earlier analysis for e[sup+]e[sup -][yields] f[bar f].
Download or read book Transverse Polarization Signatures of Extra Dimensions at the Linear Collider written by and published by . This book was released on 2002 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: If significant longitudinal polarization of both the electrons and positrons becomes feasible at a future linear collider(LC), it may be possible to use spin rotators to produce transversely polarized beams. Using the transverse polarization of both beams, new azimuthal spin asymmetries can be formed which will be sensitive probes for new physics beyond the Standard Model. Here we demonstrate that these asymmetries are particularly sensitive to the exchange of Kaluza-Klein towers of gravitons, or other spin-2 fields, that are predicted to exist in higher dimensional theories which address the hierarchy problem. These new asymmetries are shown to be able to extend the search reach for such new physics by more than a factor of two, provide an additional tool for isolating the signatures for spin-2 exchange up to mass scales in excess of 10(square root)s, and can be used to help differentiate among the proposed solutions to the hierarchy problem below the production threshold for new particles.
Download or read book Precision Electroweak Physics at Electron Positron Colliders written by Stefan Roth and published by Springer Science & Business Media. This book was released on 2007 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This up-to-date volume reviews the recent contributions of electron-positron colliders to the precision test of the electroweak Standard Model. In particular, it contains a short summary of the measurements at the Z resonance and gives an overview of the electroweak processes above the Z. Subsequently, the measurement of the W mass at LEP is discussed in detail. The implications for the precision test of the Standard Model are presented, giving the status of the global electroweak fit before the startup of Large Hadron Collider. The final chapters give an outlook on the electroweak physics at a future linear collider. The book also features many illustrations and tables. Readers obtain a coherent overview of the results of 20 years of electroweak physics conducted at electron-positron colliders.
Download or read book Physics and Experimentation at a Linear Electron positron Collider written by and published by . This book was released on 2001 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Improved Direct Measurement of Leptonic Coupling Asymmetries with Polarized Zs written by and published by . This book was released on 2004 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The SLD experiment at the Stanford Linear Collider reports new measurements of leptonic asymmetry parameters with polarized Z°'s. The authors study the reaction e{sub L, R}− + e → Z° → e+e−,?+?− and?−?+, where L and R denote left- and right-handed polarized electron beams. The 1996, 1997 and winter 1998 SLD runs are included in this analysis and combined with published data from the 1993-95 runs. Preliminary results are as follows: A{sub e} = 0.1504 ± 0.0072, A{sub {mu}} = 0.120 ± 0.019 and A{sub?} = 0.142 ± 0.019. If lepton universality is assumed, a combined asymmetry parameter A{sub e{mu}{tau}} = 0.1459 ± 0.0063 results. This translates into an effective value of the weak mixing angle sin2?{sub W}{sup eff} = 0.2317 ± 0.008 at the Z° pole.
Download or read book Precise Measurement of the Left right Cross Section Asymmetry in Z Boson Production by Electron positron Collisions written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A precise measurement of the left-right cross section asymmetry (A[sub LR]) for Z boson production by e[sup +]e[sup [minus]] collisions has been attained at the Slac Linear Collider with the SLD detector. We describe this measurement for the 1993 data run, emphasizing the significant improvements in polarized beam operation which took place for this run, where the luminosity-weighted electron beam polarization averaged 62.6 [plus-minus] 1.2 %. Preliminary 1993 results for A[sub LR] are presented. When combined with the (less precise) 1992 result, the preliminary result for the effective weak mixing angle is sin[sup 2] [theta][sub W [sup eff]] = 0.2290 [plus-minus] 0.0010.
Download or read book Physics And Experiments With Linear Colliders Lcws95 Proceedings Of The Workshop In 2 Volumes written by Yoshiaki Fujii and published by World Scientific. This book was released on 1996-08-22 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Polarized Positrons at a Future Linear Collider and the Final Focus Test Beam written by and published by . This book was released on 2004 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Having both the positron and electron beams polarized in a future linear ee− collider is a decisive improvement for many physics studies at such a machine. The motivation for polarized positrons, and a demonstration experiment for the undulator-based production of polarized positrons are reviewed. This experiment (E-166) uses the 50 GeV Final Focus Test electron beam at SLAC with a 1 m-long helical undulator to make (almost equal to) 10MeV polarized photons. These photons are then converted in a thin ((almost equal to) 0.5 radiation length) target into positrons (and electrons) with about 50% polarization.
Download or read book Revealing Fundamental Interactions written by G. Alexander and published by . This book was released on 2005 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proposed International Linear Collider (ILC) is well-suited for discovering physics beyond the Standard Model and for precisely unraveling the structure of the underlying physics. The physics return can be maximized by the use of polarized beams. This report shows the paramount role of polarized beams and summarizes the benefits obtained from polarizing the positron beam, as well as the electron beam. The physics case for this option is illustrated explicitly by analyzing reference reactions in different physics scenarios. The results show that positron polarization, combined with the clean experimental environment provided by the linear collider, allows to improve strongly the potential of searches for new particles and the identification of their dynamics, which opens the road to resolve shortcomings of the Standard Model. The report also presents an overview of possible designs for polarizing both beams at the ILC, as well as for measuring their polarization.
Download or read book The Role of Polarized Positron Beam and Its Measurement Inan E E Linear Collider written by Erez Reinherz-Aronis and published by . This book was released on 2005 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Particles Strings And Cosmology Proceedings Of The John Hopkins Workshop On Current Problems In Particle Theory 19 And The Pascos Interdisciplinary Symposium 5 written by Gabor Domokos and published by World Scientific. This book was released on 1996-07-13 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: This was a joint meeting of the Johns Hopkins Workshop and PASCOS. It was interdisciplinary in its nature. The proceedings gives an overview of the current situation in the interrelated fields of elementary particle physics, astrophysics and cosmology as well as provides a forum for the presentation new results.
Download or read book New Era For Cp Asymmetries Axions And Rare Decays Of Hadrons And Leptons written by Ikaros I Bigi and published by World Scientific. This book was released on 2021-07-14 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is dedicated to Lev Okun, who passed away in November 2015. He was a true pioneer in probing fundamental dynamics.The book has two objectives. First is to showcase Okun's impact for decades since 1963, when he published his remarkable book Weak Interaction of Elementary Particles. Second is to present the current progress of our scientific community in the studies of our Universe. New directions and possible future developments are discussed, often using the past as a guide. The authors mostly focus on CP asymmetries in the transitions of hadrons and leptons, but they also discuss their rare decays, and talk about axions and supersymmetry, and possible connections with dark matter, extra dimensions, baryogenesis and multiverse.This book is suitable for readers who know quantum mechanics and quantum field theories in general.
Download or read book The Role of Polarized Positrons and Electrons in Revealing Fundamental Interactions at the Linear Collider written by and published by . This book was released on 2005 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proposed International Linear Collider (ILC) is well-suited for discovering physics beyond the Standard Model and for precisely unraveling the structure of the underlying physics. The physics return can be maximized by the use of polarized beams. This report shows the paramount role of polarized beams and summarizes the benefits obtained from polarizing the positron beam, as well as the electron beam. The physics case for this option is illustrated explicitly by analyzing reference reactions in different physics scenarios. The results show that positron polarization, combined with the clean experimental environment provided by the linear collider, allows to improve strongly the potential of searches for new particles and the identification of their dynamics, which opens the road to resolve shortcomings of the Standard Model. The report also presents an overview of possible designs for polarizing both beams at the ILC, as well as for measuring their polarization.
Download or read book A Measurement of the Left right Cross Section Asymmetry in Z sup 0 Production with Polarized E sup e sup minus Collisions written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Stanford Linear Collider at SLAC is an e[sup +]e[sup [minus]] collider running at [radical]s [approx] M[sub Z] and has provided an electron beam with longitudinal polarization at the SLC interaction point. The 1992 polarized run data were taken with the SLD detector. The author presents here the measurement of the left-right cross section asymmetry (A[sub LR]) for the 1992 run. The polarized run began in May and ended in September of 1992 at a mean center-of-mass energy of 91.56 GeV. Tower hit information of the liquid argon calorimeter and endcap warm iron calorimeter pads were used for selecting hadronic Z[sup 0] or tau pair events. The SLD detector collected about 11,000 events during this run. The magnitude of the longitudinal polarization of the electron beam was continuously measured by a polarimeter based on Compton scattering, and was monitored by a polarimeter based on Moller scattering. The luminosity-weighted average longitudinal polarization during the 1992 run was measured as 22.4 [+-] 0.6 (syst.)%. From these data, the value of A[sub LR] has been measured to be 0.102 [+-] 0.044 (stat.) [+-] 0.003 (syst.), corresponding to an effective electroweak mixing angle (sin[sup 2][theta][sub w][sup eff]) of 0.2375 [+-] 0.0056 (stat.) [+-] 0.0004 (syst.). The error is dominated by the statistical error. This value of sin[sup 2][theta][sub w][sup eff] is in good agreement with existing measurements from other experiments. Studies of improvements in A[sub LR] event selection for future high-statistics runs are also discussed.
Download or read book The Role of Polarized Positron Beam and Its Measurement in E e Linear Collider written by Erez Reinherz-Aronis and published by . This book was released on 2005 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
