E. Boos, J. Brient, D. Reid, H. Schreiber, R. Shanidze
We examine the prospects for measuring the γγ branching fraction of a Standard Model-like Higgs boson with a mass of 120 GeV at the future TESLA linear e+e− collider, assuming an integrated luminosity of 1 ab−1 and center-of-mass energies of 350 GeV and 500 GeV. The Higgs boson is produced in association with a fermion pair via the Higgsstrahlung process e+e−→ZH, with Z→qq or νν, or the WW fusion reaction e+e−→νeνeH. A relative uncertainty on BF(H→γγ) of 16% can be achieved in unpolarized e+e− collisions at s=500 GeV, while for s=350 GeV the expected precision is slightly poorer. With appropriate initial state polarizations ΔBF(H→γγ)/BF(H→γγ) can be improved to 10%.
{"title":"Measuring the Higgs branching fraction into two photons at future linear e+e− colliders","authors":"E. Boos, J. Brient, D. Reid, H. Schreiber, R. Shanidze","doi":"10.1063/1.1394321","DOIUrl":"https://doi.org/10.1063/1.1394321","url":null,"abstract":"We examine the prospects for measuring the γγ branching fraction of a Standard Model-like Higgs boson with a mass of 120 GeV at the future TESLA linear e+e− collider, assuming an integrated luminosity of 1 ab−1 and center-of-mass energies of 350 GeV and 500 GeV. The Higgs boson is produced in association with a fermion pair via the Higgsstrahlung process e+e−→ZH, with Z→qq or νν, or the WW fusion reaction e+e−→νeνeH. A relative uncertainty on BF(H→γγ) of 16% can be achieved in unpolarized e+e− collisions at s=500 GeV, while for s=350 GeV the expected precision is slightly poorer. With appropriate initial state polarizations ΔBF(H→γγ)/BF(H→γγ) can be improved to 10%.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"1907 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127456826","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}
Indications of new physics phenomena in fermion-pair production are tested for a linear collider. A general approach in terms of contact interactions is discussed as well as the influence of Z′ exchange and extra dimensions. The role of positron polarization is considered, systematic errors are taken into account.
{"title":"Indications of new physics in fermion pair production","authors":"S. Riemann","doi":"10.1063/1.1394392","DOIUrl":"https://doi.org/10.1063/1.1394392","url":null,"abstract":"Indications of new physics phenomena in fermion-pair production are tested for a linear collider. A general approach in terms of contact interactions is discussed as well as the influence of Z′ exchange and extra dimensions. The role of positron polarization is considered, systematic errors are taken into account.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"113 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127467356","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}
This report summarizes the contributions to and discussions of the QCD/Two-Photon Physics working group. Topics covered in the working group parallel session were related to precision measurements of αs and various QCD aspects of photon interactions including real and virtual photon structure and QCD dynamics. Also, reports on progress in theoretical and calculational techniques related to QCD processes at an e+e− linear collider were presented.
{"title":"QCD/Two-Photon Physics—summary report","authors":"S. Magill","doi":"10.1063/1.1394343","DOIUrl":"https://doi.org/10.1063/1.1394343","url":null,"abstract":"This report summarizes the contributions to and discussions of the QCD/Two-Photon Physics working group. Topics covered in the working group parallel session were related to precision measurements of αs and various QCD aspects of photon interactions including real and virtual photon structure and QCD dynamics. Also, reports on progress in theoretical and calculational techniques related to QCD processes at an e+e− linear collider were presented.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123417501","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 design work and R&D program of the LCFI collaboration for a CCD vertex detector at the future linear collider is discussed. The physics goals can be met by a 5-layer cylindrical detector system of 800 Mpixels, with polar angle coverage to |cos θ|=0.96. The main challenges are in the layer thickness and the readout architecture. The latter is particularly challenging for TESLA due to the time structure of the machine. Solutions to these problems are described and supported by simulations. Encouraging early R&D results on the question of layer thickness are reported. It seems probable that a well-supported 5-year R&D program should lead to a buildable detector design which satisfies the physics goals.
{"title":"A CCD vertex detector for the future Linear Collider","authors":"C. Damerell","doi":"10.1063/1.1394425","DOIUrl":"https://doi.org/10.1063/1.1394425","url":null,"abstract":"The design work and R&D program of the LCFI collaboration for a CCD vertex detector at the future linear collider is discussed. The physics goals can be met by a 5-layer cylindrical detector system of 800 Mpixels, with polar angle coverage to |cos θ|=0.96. The main challenges are in the layer thickness and the readout architecture. The latter is particularly challenging for TESLA due to the time structure of the machine. Solutions to these problems are described and supported by simulations. Encouraging early R&D results on the question of layer thickness are reported. It seems probable that a well-supported 5-year R&D program should lead to a buildable detector design which satisfies the physics goals.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127730937","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 briefly describe the principles of operation of the program package SIMDET, a parametric Monte Carlo program to simulate the response of a detector for the TESLA linear collider. Main detector components are implemented according to the TESLA Conceptual Design report, with a tracking system, an electromagnetic and a hadronic calorimeter, a vertex and a luminosity detector. Using the results from the ab initio Monte Carlo program BRAHMS, track parameters and calorimetric deposits are treated in a realistic way. Pattern recognition is emulated using cross references between generated particles and detector response. An energy flow algorithm defines the output of the program. Further improvements and completions of SIMDET are also discussed.
{"title":"SIMDET—a parametric Monte Carlo for a TESLA detector","authors":"Martin Pohl, H. Schreiber","doi":"10.1063/1.1394403","DOIUrl":"https://doi.org/10.1063/1.1394403","url":null,"abstract":"We briefly describe the principles of operation of the program package SIMDET, a parametric Monte Carlo program to simulate the response of a detector for the TESLA linear collider. Main detector components are implemented according to the TESLA Conceptual Design report, with a tracking system, an electromagnetic and a hadronic calorimeter, a vertex and a luminosity detector. Using the results from the ab initio Monte Carlo program BRAHMS, track parameters and calorimetric deposits are treated in a realistic way. Pattern recognition is emulated using cross references between generated particles and detector response. An energy flow algorithm defines the output of the program. Further improvements and completions of SIMDET are also discussed.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124399613","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}
Motivated by recent data from the Super-Kamiokande experiment that suggests neutrinos are massive, we investigate the capability of the next generation linear collider to probe the existence of neutrino Yukawa couplings, fν, via precision measurements of slepton masses. Assuming the see-saw framework and a hierarchical pattern of neutrino masses, we construct mass combinations to isolate the effects of the neutrino Yukawa coupling on the slepton masses. We find that these effects would be detectable if mντ can be determined with a precision of 2–3%, assuming fν=ft at Q=MGUT. Finally we discuss whether such a measurements would be possible at an e+e− linear collider.
{"title":"Third generation slepton mass measurements as a probe of neutrino Yukawa interactions","authors":"H. Baer, C. Balázs, J. Mizukoshi, X. Tata","doi":"10.1063/1.1394362","DOIUrl":"https://doi.org/10.1063/1.1394362","url":null,"abstract":"Motivated by recent data from the Super-Kamiokande experiment that suggests neutrinos are massive, we investigate the capability of the next generation linear collider to probe the existence of neutrino Yukawa couplings, fν, via precision measurements of slepton masses. Assuming the see-saw framework and a hierarchical pattern of neutrino masses, we construct mass combinations to isolate the effects of the neutrino Yukawa coupling on the slepton masses. We find that these effects would be detectable if mντ can be determined with a precision of 2–3%, assuming fν=ft at Q=MGUT. Finally we discuss whether such a measurements would be possible at an e+e− linear collider.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130125299","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 muon system for Linear Collider experiments has requirements and challenges very similat to that of large neutrino detectors. We present a concept of the muon system based on extruded solid scintillator strips as an active medium. This is a straightforward extension of the technology used in the MINOS long baseline neutrino oscillations experiment.
{"title":"Solid scintillator-based muon detector for Linear Collider experiments","authors":"A. Para","doi":"10.1063/1.1394443","DOIUrl":"https://doi.org/10.1063/1.1394443","url":null,"abstract":"A muon system for Linear Collider experiments has requirements and challenges very similat to that of large neutrino detectors. We present a concept of the muon system based on extruded solid scintillator strips as an active medium. This is a straightforward extension of the technology used in the MINOS long baseline neutrino oscillations experiment.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134457456","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}
Resonance formation in WW scattering at a linear e+e− collider with a center of mass energy of 3 TeV is studied. The detector response of the events is simulated and hadronic machine background from γγ scattering is included in the study.
{"title":"WW Scattering at CLIC","authors":"A. Roeck","doi":"10.1063/1.1394379","DOIUrl":"https://doi.org/10.1063/1.1394379","url":null,"abstract":"Resonance formation in WW scattering at a linear e+e− collider with a center of mass energy of 3 TeV is studied. The detector response of the events is simulated and hadronic machine background from γγ scattering is included in the study.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133895362","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}
K. Stefanov, T. Tsukamoto, A. Miyamoto, Y. Sugimoto, N. Tamura, K. Abe, T. Nagamine, T. Aso
In this paper we summarize the research activities at the JLC Vertex group. A simulation study of the vertex detector performance has started, which has as a goal optimization of its design. Attention has been paid to the mechanical distortions of CCD chips and their supporting ladders, caused by cooling. Laser measurement system to investigate the distortions has been assembled and preliminary measurements on CCDs have been obtained. Radiation damage effects on CCDs have been extensively studied and some important conclusions on preferable device structure and operation conditions has been drawn. A study of charge sharing between the CCD pixels, which is important in particle detector applications, is also under way.
{"title":"Studies of CCDs for Vertex detector application","authors":"K. Stefanov, T. Tsukamoto, A. Miyamoto, Y. Sugimoto, N. Tamura, K. Abe, T. Nagamine, T. Aso","doi":"10.1063/1.1394424","DOIUrl":"https://doi.org/10.1063/1.1394424","url":null,"abstract":"In this paper we summarize the research activities at the JLC Vertex group. A simulation study of the vertex detector performance has started, which has as a goal optimization of its design. Attention has been paid to the mechanical distortions of CCD chips and their supporting ladders, caused by cooling. Laser measurement system to investigate the distortions has been assembled and preliminary measurements on CCDs have been obtained. Radiation damage effects on CCDs have been extensively studied and some important conclusions on preferable device structure and operation conditions has been drawn. A study of charge sharing between the CCD pixels, which is important in particle detector applications, is also under way.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"41 17","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120858727","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 dE/dx resolution of the TESLA-TPC has been studied using a toy Monte Carlo simulation based on measured cluster size distributions. Various parameters like sampling length, electronics noise, crosstalk etc. have been investigated. An optimum number of 240 samples has been found (5 mm sampling length) with a simulated dE/dx resolution of 4.1%. The particle separation power has been estimated.
{"title":"Particle ID with dE/dx at the TESLA-TPC","authors":"M. Hauschild","doi":"10.1063/1.1394446","DOIUrl":"https://doi.org/10.1063/1.1394446","url":null,"abstract":"The dE/dx resolution of the TESLA-TPC has been studied using a toy Monte Carlo simulation based on measured cluster size distributions. Various parameters like sampling length, electronics noise, crosstalk etc. have been investigated. An optimum number of 240 samples has been found (5 mm sampling length) with a simulated dE/dx resolution of 4.1%. The particle separation power has been estimated.","PeriodicalId":325505,"journal":{"name":"Physics and experiments with future linear e+ e- colliders","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124850921","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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