The sensitivity of e+e− linear colliders to strong W+W− scattering effects in e+e−→W+W− is examined. Past studies have concentrated on e+e− linear colliders with center-of-mass energies of more than 1 TeV and integrated luminosities of less than 200 fb−1. Here we review the strong symmetry breaking signals that can be observed with center-of-mass energies of 0.5–0.8 TeV and luminosities of 300–500 fb−1.
{"title":"Strong Symmetry Breaking Signals in e+e−→W+W− at s=800 GeV","authors":"T. Barklow","doi":"10.1063/1.1394383","DOIUrl":"https://doi.org/10.1063/1.1394383","url":null,"abstract":"The sensitivity of e+e− linear colliders to strong W+W− scattering effects in e+e−→W+W− is examined. Past studies have concentrated on e+e− linear colliders with center-of-mass energies of more than 1 TeV and integrated luminosities of less than 200 fb−1. Here we review the strong symmetry breaking signals that can be observed with center-of-mass energies of 0.5–0.8 TeV and luminosities of 300–500 fb−1.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130702975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A novel design of the Final Focus has recently been proposed [1] and has been adopted now for the Next Linear Collider [2]. This new design has fewer optical elements and is much shorter, nonetheless achieving better chromatic properties. In this paper, the new final focus system is briefly discussed stressing one particular characteristic of the new design—its multi TeV energy reach.
最近提出了一种新颖的Final Focus设计[1]，现在已被Next Linear Collider[2]采用。这种新设计具有更少的光学元件和更短的长度，但却获得了更好的色度特性。本文简要介绍了新型末焦系统，并着重介绍了其多TeV能量到达的特点。
{"title":"New NLC final focus","authors":"P. Raimondi, A. Seryi","doi":"10.1063/1.1394420","DOIUrl":"https://doi.org/10.1063/1.1394420","url":null,"abstract":"A novel design of the Final Focus has recently been proposed [1] and has been adopted now for the Next Linear Collider [2]. This new design has fewer optical elements and is much shorter, nonetheless achieving better chromatic properties. In this paper, the new final focus system is briefly discussed stressing one particular characteristic of the new design—its multi TeV energy reach.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116452373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Naturalness considerations are frequently used to place theoretical upper limits on the masses of new particles in supersymmetric extensions of the standard model. These theoretical limits, in turn, shape our expectations of how likely it is that new physics will be discovered at any particular collider. A significant portion of the literature devoted to naturalness studies apply criteria which do not have a reliable correspondence to fine-tuning. This report discusses the principled method for quantifying naturalness, and presents theoretical bounds on sparticle masses in two scenarios.
{"title":"The naturalness principle and expectations for a linear collider","authors":"G. Anderson","doi":"10.1063/1.1394360","DOIUrl":"https://doi.org/10.1063/1.1394360","url":null,"abstract":"Naturalness considerations are frequently used to place theoretical upper limits on the masses of new particles in supersymmetric extensions of the standard model. These theoretical limits, in turn, shape our expectations of how likely it is that new physics will be discovered at any particular collider. A significant portion of the literature devoted to naturalness studies apply criteria which do not have a reliable correspondence to fine-tuning. This report discusses the principled method for quantifying naturalness, and presents theoretical bounds on sparticle masses in two scenarios.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129766814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We study the feasibility of measuring the cross section of Higgs boson production in the WW-fusion process, e+e−→νeνeH0, at a future linear collider at center-of-mass energies between 350 and 500 GeV. Realistic assumptions for detector resolution effects, b-quark tagging efficiency and background processes are made. Using the decay mode H0→bb the cross section can be measured to an accuracy of 3% for a Higgs boson mass of 120 GeV, assuming 500fb−1 of data. This measurement can be used to extract the coupling gHWW between Higgs and W bosons and indirectly determine the total decay width of the Higgs boson.
{"title":"Study of Higgs boson production through WW-fusion at a linear collider","authors":"K. Desch, N. Meyer","doi":"10.1063/1.1394317","DOIUrl":"https://doi.org/10.1063/1.1394317","url":null,"abstract":"We study the feasibility of measuring the cross section of Higgs boson production in the WW-fusion process, e+e−→νeνeH0, at a future linear collider at center-of-mass energies between 350 and 500 GeV. Realistic assumptions for detector resolution effects, b-quark tagging efficiency and background processes are made. Using the decay mode H0→bb the cross section can be measured to an accuracy of 3% for a Higgs boson mass of 120 GeV, assuming 500fb−1 of data. This measurement can be used to extract the coupling gHWW between Higgs and W bosons and indirectly determine the total decay width of the Higgs boson.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125601561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The unambiguous verification of the spinless nature of the Higgs boson in the Standard Model and related extensions is demonstrated in a model-independent way, by studying the threshold dependence of the excitation curve and the angular distribution in Higgs-strahlung at e+e− colliders, e+e−→ZH.
{"title":"Measuring the spin of the Higgs boson from Higgs-strahlung","authors":"D. Miller","doi":"10.1063/1.1394312","DOIUrl":"https://doi.org/10.1063/1.1394312","url":null,"abstract":"The unambiguous verification of the spinless nature of the Higgs boson in the Standard Model and related extensions is demonstrated in a model-independent way, by studying the threshold dependence of the excitation curve and the angular distribution in Higgs-strahlung at e+e− colliders, e+e−→ZH.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131602214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Future linear colliders are very different at many aspects because of low repetition rate (5∼200 Hz) and high accelerating gradient (22∼150 MeV/m). For high luminosity, the beam sizes must be squeezed in extremely small region at interaction point (IP). We briefly describe new phenomena at the IP, i.e. beamstrahlung process, creations of e+e− pairs and minijets. We also report machine implications related to the energy spread, beamstrahlung, bunch-train structure, beam polarizations and backgrounds for detectors and physics.
{"title":"Machine implications for detectors and physics","authors":"T. Tauchi","doi":"10.1063/1.1394302","DOIUrl":"https://doi.org/10.1063/1.1394302","url":null,"abstract":"Future linear colliders are very different at many aspects because of low repetition rate (5∼200 Hz) and high accelerating gradient (22∼150 MeV/m). For high luminosity, the beam sizes must be squeezed in extremely small region at interaction point (IP). We briefly describe new phenomena at the IP, i.e. beamstrahlung process, creations of e+e− pairs and minijets. We also report machine implications related to the energy spread, beamstrahlung, bunch-train structure, beam polarizations and backgrounds for detectors and physics.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133029043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We present a fully object-oriented framework which provides the tools for track finding and fitting in a particle physics detector. The software is modular and extensible so that it can be applied to a wide range of detectors and can be finely tuned to optimize performance. We believe that this package can provide a common solution to the requirements of the Linear Collider simulation community.
{"title":"Pattern Recognition and Track Fitting in Central Trackers","authors":"N. Graf","doi":"10.1063/1.1394438","DOIUrl":"https://doi.org/10.1063/1.1394438","url":null,"abstract":"We present a fully object-oriented framework which provides the tools for track finding and fitting in a particle physics detector. The software is modular and extensible so that it can be applied to a wide range of detectors and can be finely tuned to optimize performance. We believe that this package can provide a common solution to the requirements of the Linear Collider simulation community.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133523870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An initial design of the optics required for producing gamma-gamma collisions was produced for the NLC Zeroth Order Design Report (ZDR) submitted to the 1996 Snowmass workshop. The design incorporated only loose constraints from the interaction region requirements. In this paper we report progress on a design of a gamma-gamma interaction region which incorporates all constraints.
{"title":"Gamma-gamma interaction region design issues","authors":"J. Gronberg","doi":"10.1063/1.1394412","DOIUrl":"https://doi.org/10.1063/1.1394412","url":null,"abstract":"An initial design of the optics required for producing gamma-gamma collisions was produced for the NLC Zeroth Order Design Report (ZDR) submitted to the 1996 Snowmass workshop. The design incorporated only loose constraints from the interaction region requirements. In this paper we report progress on a design of a gamma-gamma interaction region which incorporates all constraints.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114797178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Karlen, Bob Carnegie, M. Dixit, J. Dubeau, H. Mes, M. O’Neill, E. Neuheimer, Anna K. Kristofferson, Jeff Mottershead
The Gas Electron Multiplier (GEM) is a leading candidate for the readout of the Time Projection Chamber (TPC) at a future linear collider detector. This presentation describes measurements of the space point resolution of a GEM with relatively large hexagonal pads. Resolution of approximately 50 μm is achieved for 4.5 keV x-rays with two independent methods, using charge sharing and using induction signals.
{"title":"Investigation of GEM space point resolution for a TPC tracker","authors":"D. Karlen, Bob Carnegie, M. Dixit, J. Dubeau, H. Mes, M. O’Neill, E. Neuheimer, Anna K. Kristofferson, Jeff Mottershead","doi":"10.1063/1.1394433","DOIUrl":"https://doi.org/10.1063/1.1394433","url":null,"abstract":"The Gas Electron Multiplier (GEM) is a leading candidate for the readout of the Time Projection Chamber (TPC) at a future linear collider detector. This presentation describes measurements of the space point resolution of a GEM with relatively large hexagonal pads. Resolution of approximately 50 μm is achieved for 4.5 keV x-rays with two independent methods, using charge sharing and using induction signals.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116994592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
During LCWS 1999 at Sitges, Spain, we presented a set of discriminators for reconstructing jets in high energy lepton colliders. We have extended that study by adding new event types, by adding new discriminators, and by using a neural net rather than cuts to identify jets. We apply these techniques to detector simulations to begin a study of calorimeter optimization.
{"title":"Calorimeter optimization for jet identification","authors":"G. Bower","doi":"10.1063/1.1394454","DOIUrl":"https://doi.org/10.1063/1.1394454","url":null,"abstract":"During LCWS 1999 at Sitges, Spain, we presented a set of discriminators for reconstructing jets in high energy lepton colliders. We have extended that study by adding new event types, by adding new discriminators, and by using a neural net rather than cuts to identify jets. We apply these techniques to detector simulations to begin a study of calorimeter optimization.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129630892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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