https://vital.lib.tsu.ru/vital/access/manager/Index en-us 5 Using Z boson events to study parton-medium interactions in Pb-Pb collisions https://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001002204 30 GeV/c are analyzed. The Z boson constrains the initial energy and direction of the associated parton. In heavy ion events, azimuthal angular distributions of charged hadrons with respect to the direction of a Z boson are sensitive to modifications of the in-medium parton shower and medium response. compared to reference data from pp interactions, the results for central Pb-Pb collisions indicate a modification of the angular correlations. The measurements of the fragmentation functions and p(T) spectra of charged particles in Z boson events, which are sensitive to medium modifications of the parton shower longitudinal structure, are also reported. Significant modifications in central Pb-Pb events compared to the pp reference data are also found for these observables.]]> Tue 06 Jun 2023 15:22:25 KRAT ]]> Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production https://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001016038 Thu 21 Dec 2023 15:16:45 KRAT ]]> Inclusive and differential cross section measurements of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 TeV https://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001002747 Sat 17 Jun 2023 00:06:15 KRAT ]]> Search for long-lived particles produced in association with a Z boson in proton-proton collisions at √s = 13 TeV https://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001002446 SS). The Higgs boson decay branching fraction is constrained to values less than 6% for proper decay lengths of 10-100 mm and for LLP masses between 40 and 55 GeV. In the case of low-mass (approximate to 15 GeV) scalar particles that subsequently decay to a pair of b quarks, the search is sensitive to branching fractions B(H -> SS) < 20% for proper decay lengths of 10-50 mm. The use of associated production with a Z boson increases the sensitivity to low-mass LLPs of this analysis with respect to gluon fusion searches. In the case of 15 GeV scalar LLPs, the improvement corresponds to a factor of 2 at a proper decay length of 30 mm.]]> Mon 16 Sep 2024 15:53:12 KRAT ]]> Search for heavy resonances decaying to ZZ or ZW and axion-like particles mediating nonresonant ZZ or ZH production at √s = 13 TeV https://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001002122 Mon 05 Jun 2023 15:34:22 KRAT ]]>