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001-es BibID:	BIBFORM113480
035-os BibID:	(Scopus)85147416320 (WoS)000950501000012 (cikkazonosító)014028
Első szerző:	Bevilacqua, Giuseppe
Cím:	tt over line bb over line at the LHC: On the size of off-shell effects and prompt b-jet identification / G. Bevilacqua, H. Y. Bi, H. B. Hartanto, M. Kraus, M. Lupattelli, M. Worek
Dátum:	2023
ISSN:	2470-0010 2470-0029
Megjegyzések:	We investigate full off-shell effects in tt over bar bb over bar production in the dilepton channel at the LHC with the ffifficenter-of-massenergyps = 13 TeV. Specifically, we compute next-to-leading-order (NLO) QCD corrections to the pp -e+nu e mu-nu over bar mu bb over bar bb over bar + X process and provide a prescription for b-jet identification to distinguish prompt b jets from b jets originating from the decay of the top quarks. As an important irreducible background to pp -tt over bar H(H -bb over bar ), tt over bar production in association with two prompt b jets is a primary source of uncertainty in the measurement of tt over bar H(H -bb over bar ). In quantifying full off-shell effects, we perform comparisons between the state-of-the-art full off-shell computation and the calculation in the narrow width approximation. The former includes all double-, single-and nonresonant Feynman diagrams, interferences as well as finite-width effects of the top quarks and W gauge bosons. The latter restricts the unstable top quarks and W gauge bosons to on-shell states and includes for the first time NLO QCD corrections to both production and decays. We observe that full off-shell effects are subdominant compared to the scale uncertainties for the integrated fiducial cross section and for the majority of differential observables in the phase-space regions that we investigated. However, for a number of observables related to beyond the Standard Model searches, full off-shell effects are significant. Furthermore, with our b-jet labeling prescription, the prompt b jets and the b jets from top-quark decays can be successfully disentangled.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Physical Review D. - 107 : 1 (2023), p. 1-18. -
További szerzők:	Bi, Huan-Yu Hartanto, Heribertus Bayu Kraus, Manfred Lupatelli, Michele Worek, Malgorzata
Pályázati támogatás:	K 125105 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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