The a_1(1260) lineshape measured in D -> 4pi decays

Mar 14, 2017, 5:00 PM
30m
Lecture Hall (Bad Honnef)

Lecture Hall

Bad Honnef

Speaker

Mr Philippe d'Argent (Ruprecht-Karls-Universitaet Heidelberg (DE))

Description

The decay $D^{0} \rightarrow \pi^{+}\pi^{-}\pi^{+}\pi^{-}$, with $D^{0} \rightarrow a_1(1260)^{+} \pi^{-}$ being the dominant intermediate state, provides an excellent environment to study the properties of the $a_1(1260)$ meson. We present new measurements of the $a_1(1260)$’s mass and width using data collected with the CLEO-c detector. The $a_1(1260)$ contribution is disentangled from the other occurring decay channels by means of a full five-dimensional amplitude analysis. A state-of-the-art parameterization of the $a_1(1260)$ lineshape is used taking into account the resonant three-pion substructure. In addition, several other lineshape models are tested. As we observe a significant dependence of the measured width on the chosen parameterization, a quasi-model-independent study of the lineshape is performed as well.

Primary authors

Mr Philippe d'Argent (Ruprecht-Karls-Universitaet Heidelberg (DE)) Jeremy Peter Dalseno (University of Bristol (GB)) Jonas Rademacker (University of Bristol (GB))

Co-authors

Jack Benton (University of Bristol (GB)) Evelina Mihova Gersabeck (Ruprecht-Karls-Universitaet Heidelberg (DE)) Samuel Thomas Harnew (University of Bristol (GB)) Paras Naik (University of Bristol (GB)) Claire Prouve (University of Bristol (GB)) Nicola Anne Skidmore (University of Bristol (GB))

Presentation materials