[Halld-physics] [EXTERNAL] new exotic state from BESIII

[Shepherd, Matthew]

Hi all,

Tonight on the arXiv is an interesting new result of relevance to GlueX:

https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_abs_2202.00621&d=DwIGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=p3b5acpwYNkmZ3alLqoe1DpcHi6vq5JvK_7ohJe1WqI&m=awYX0H9pabs1osN2z2e0FgFI3DSzDaCgyxGqwzQO1k4wp3Pyr1xL8b9VCHgRCWBq&s=NcE_wnz8qmlCU-GNnBK5MYsaKiG_ErOxVLxrpKiYRkg&e= 

"Observation of an isoscalar resonance with exotic JPC=1−+ quantum numbers in J/ψ→γηη′"

submitted to PRL, and the companion long article for PRD:

https://urldefense.proofpoint.com/v2/url?u=https-3A__arxiv.org_abs_2202.00623&d=DwIGaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=p3b5acpwYNkmZ3alLqoe1DpcHi6vq5JvK_7ohJe1WqI&m=awYX0H9pabs1osN2z2e0FgFI3DSzDaCgyxGqwzQO1k4wp3Pyr1xL8b9VCHgRCWBq&s=s58I4cXPOd8g7m4v_KVFzIpyiQwImEoW2u8cOBPa3-M&e= 

It is interesting that the state is relatively narrow (~200 MeV).

Happy Chinese New Year!

Matt