Description: Where Is the Lightest Charmed Scalar Meson?

This title appears in the Scientific Report : 2021

Where Is the Lightest Charmed Scalar Meson?

The lightest charmed scalar meson is known as the D∗0(2300), which is one of the earliest new hadron resonances observed at modern B factories. We show here that the parameters assigned to the lightest scalar D meson are in conflict with the precise LHCb data of the decay B−→D+π−π−. On the contrary,...

Personal Name(s):	Du, Meng-Lin (Corresponding author)
	Guo, Feng-Kun / Hanhart, Christoph / Kubis, Bastian / Meißner, Ulf-G.
Contributing Institute:	Theorie der Starken Wechselwirkung; IAS-4
Published in:	Physical review letters, 126 (2021) 19, S. 192001
Imprint:	College Park, Md. APS 2021
DOI:	10.1103/PhysRevLett.126.192001
Document Type:	Journal Article
Research Program:	Enabling Computational- & Data-Intensive Science and Engineering
Link:	OpenAccess
	Publikationsportal JuSER

Please use the identifier: http://hdl.handle.net/2128/27870 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.126.192001 in citations.

The lightest charmed scalar meson is known as the D∗0(2300), which is one of the earliest new hadron resonances observed at modern B factories. We show here that the parameters assigned to the lightest scalar D meson are in conflict with the precise LHCb data of the decay B−→D+π−π−. On the contrary, these data can be well described by an unitarized chiral amplitude containing a much lighter charmed scalar meson, the D∗0(2100). We also extract the low-energy S-wave Dπ phase of the decay B−→D+π−π− from the data in a model-independent way, and show that its difference from the Dπ scattering phase shift can be traced back to an intermediate ρ− exchange. Our work highlights that an analysis of data consistent with chiral symmetry, unitarity, and analyticity is mandatory in order to extract the properties of the ground-state scalar mesons in the singly heavy sector correctly, in analogy to the light scalar mesons f0(500) and K∗0(700)