An amplitude analysis of the D + → π − π + π + decay is performed with a sample corresponding to 1.5 fb −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)0 π + and f 2(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. [Figure not available: see fulltext.]
Amplitude analysis of the D+ → π−π+π+ decay and measurement of the π−π+ S-wave amplitude
D. Brundu;S. Cadeddu;S. Chen;A. Contu;F. Dettori;F. Dordei;M. Garau;A. Lai;A. Lampis;G. Manca;R. Oldeman;B. Saitta;
2023-01-01
Abstract
An amplitude analysis of the D + → π − π + π + decay is performed with a sample corresponding to 1.5 fb −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)0 π + and f 2(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. [Figure not available: see fulltext.]File | Dimensione | Formato | |
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