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Browsing by Author "Krupa, Beata"

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    Higgs physics at the CLIC electron–positron linear collider
    (The European Physical Journal C, 2017) Daniluk, Witold; Krupa, Beata; Kucharczyk, Marcin; Lesiak, Tadeusz; Moszczyński, Arkadiusz; Pawlik, Bogdan; Sopicki, Paweł; Wojtoń, Tomasz; Zawiejski, Leszek
    The Compact Linear Collider (CLIC) is an option for a future e+e− collider operating at centre-of-mass energies up to 3 TeV, providing sensitivity to a wide range of new physics phenomena and precision physics measurements at the energy frontier. This paper is the first comprehensive presentation of the Higgs physics reach of CLIC operating at three energy stages: √s = 350 GeV, 1.4 and 3 TeV. The initial stage of operation allows the study of Higgs boson production in Higgsstrahlung (e+e− → ZH) and WW-fusion (e+e− → Hνe ¯νe), resulting in precise measurements of the production cross sections, the Higgs total decay width ΓH, and model-independent determinations of the Higgs couplings. Operation at √s > 1 TeV provides high-statistics samples of Higgs bosons produced through WW-fusion, enabling tight constraints on the Higgs boson couplings. Studies of the rarer processes e+e− → t¯tH and e+e− → HHνe ¯νe allow measurements of the top Yukawa coupling and the Higgs boson self-coupling. This paper presents detailed studies of the precision achievable with Higgs measurements at CLIC and describes the interpretation of these measurements in a global fit.
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    The optical alignment system for luminosity detector at ILC
    (Institute of Nuclear Physics Polish Academy of Sciences, 2014) Banaś, Elżbieta; Daniluk, Witold; Kielar, Eryk; Kotuła, Jerzy; Krupa, Beata; Moszczyński, Arkadiusz; Oliwa, Krzysztof; Pawlik, Bogdan; Wierba, Wojciech; Zawiejski, Leszek
    The possibility to use semi-transparent silicon detectors to measure the displacement detector luminosity LumiCal, planned for the future linear accelerator ILC / CLIC, was studied using an optical laser system based on these detectors. Preliminary results of measurements were achieved using the prototype of this system provided in the displacement measurement values of the X and Y directions with an accuracy of a few microns.