Amplitude analysis of the D⁺ ->π⁻ π⁺π⁺ decay and measurement of the π⁻π⁺ S-wave amplitude

Авторы: Бережной А.В., Горелов И.В., Данилина А.В., Козачук А.Д., Лефлат А.К., Никитин Н.В., Саврина Д.В., Соломин А.Н., Волков В.Ю., Жуков В.Ю., Королев М.Г., LHCb Collaboration
Журнал: Journal of High Energy Physics
Том: 6
Год издания: 2023
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 044
DOI: 10.1007/JHEP06(2023)044
Аннотация: An amplitude analysis of the D+→π−π+π+ decay is performed with a sample corresponding to 1.5fb−1 of integrated luminosity of pp collisions at a centre-of-mass energy s√=8 TeV collected by the LHCb detector in 2012. The sample contains approximately six hundred thousand candidates with a signal purity of 95%. The resonant structure is studied through a fit to the Dalitz plot where the π−π+ S-wave amplitude is extracted as a function of π−π+ mass, and spin-1 and spin-2 resonances are included coherently through an isobar model. The S-wave component is found to be dominant, followed by the ρ(770)0π+ and f2(1270)π+ components. A small contribution from the ω(782)→π−π+ decay is seen for the first time in the D+→π−π+π+ decay.
Добавил в систему: Бережной Александр Викторович

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