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

LHCb Collaboration; Simone Bifani; Ryan Calladine; Naomi Cooke; Jonathan Plews; Niladribihari Sahoo; Mark Slater; Paul Swallow; D. J. D. Thompson

doi:10.1007/JHEP06(2023)044

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

LHCb Collaboration, Simone Bifani, Ryan Calladine, Naomi Cooke, Jonathan Plews, Niladribihari Sahoo, Mark Slater, Paul Swallow, D. J. D. Thompson

Physics and Astronomy

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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)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.

Original language	English
Article number	44
Journal	JHEP
Volume	2023
DOIs	https://doi.org/10.1007/JHEP06(2023)044
Publication status	Published - 9 Jun 2023

Bibliographical note

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-016.html (LHCb public pages)

Keywords

hep-ex

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LHCb2023AmplitudeFinal published version, 4.83 MBLicence: Creative Commons: Attribution (CC BY)

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@article{40add5e4d176456384c596e063b2347b,

title = "Amplitude analysis of the D+ → π−π+π+ decay and measurement of the π−π+ S-wave amplitude.",

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)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.",

keywords = "hep-ex",

author = "{LHCb Collaboration} and Nigel Watson and Simone Bifani and Ryan Calladine and Naomi Cooke and Jonathan Plews and Niladribihari Sahoo and Mark Slater and Paul Swallow and Thompson, {D. J. D.}",

note = "All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-016.html (LHCb public pages)",

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month = jun,

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language = "English",

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TY - JOUR

T1 - Amplitude analysis of the D+ → π−π+π+ decay and measurement of the π−π+ S-wave amplitude.

AU - LHCb Collaboration

AU - Watson, Nigel

AU - Bifani, Simone

AU - Calladine, Ryan

AU - Cooke, Naomi

AU - Plews, Jonathan

AU - Sahoo, Niladribihari

AU - Slater, Mark

AU - Swallow, Paul

AU - Thompson, D. J. D.

N1 - All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-016.html (LHCb public pages)

PY - 2023/6/9

Y1 - 2023/6/9

N2 - 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)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.

AB - 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)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.

KW - hep-ex

U2 - 10.1007/JHEP06(2023)044

DO - 10.1007/JHEP06(2023)044

M3 - Article

SN - 1126-6708

VL - 2023

JO - JHEP

JF - JHEP

M1 - 44

ER -

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

Abstract

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Keywords

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