An updated review of the new hadron states

HX Chen, W Chen, X Liu, YR Liu… - Reports on Progress in …, 2022 - iopscience.iop.org
The past decades witnessed the golden era of hadron physics. Many excited open heavy
flavor mesons and baryons have been observed since 2017. We shall provide an updated …

The XYZ states: experimental and theoretical status and perspectives

N Brambilla, S Eidelman, C Hanhart, A Nefediev… - Physics reports, 2020 - Elsevier
The quark model was formulated in 1964 to classify mesons as bound states made of a
quark–antiquark pair, and baryons as bound states made of three quarks. For a long time all …

Threshold cusps and triangle singularities in hadronic reactions

FK Guo, XH Liu, S Sakai - Progress in Particle and Nuclear Physics, 2020 - Elsevier
The spectrum of hadrons is the manifestation of color confinement of quantum
chromodynamics. Hadronic resonances correspond to poles of the S-matrix. Since 2003 …

First observation of a doubly charged tetraquark and its neutral partner

R Aaij, ASW Abdelmotteleb, C Abellan Beteta… - Physical Review Letters, 2023 - APS
A combined amplitude analysis is performed for the decays B 0→ D¯ D 0 s+ π-and B+→ DD
s+ π+, which are related by isospin symmetry. The analysis is based on data collected by the …

Open-charm tetraquark and open-bottom tetraquark

XG He, W Wang, R Zhu - The European Physical Journal C, 2020 - Springer
Motivated by the LHCb observation of exotic states X_ 0, 1 (2900) X 0, 1 (2900) with four
open quark flavors in the D^-K^+ D-K+ invariant mass distribution in the decay channel B^ ± …

Lattice investigation of exotic tetraquark channels

RJ Hudspith, B Colquhoun, A Francis, R Lewis… - Physical Review D, 2020 - APS
We perform an nf= 2+ 1 lattice study of a number of channels where past claims exist in the
literature for the existence of strong-interaction-stable light-heavy tetraquarks. We find no …

X0 (2900) and X1 (2900): hadronic molecules or compact tetraquarks

HX Chen, W Chen, RR Dong, N Su - Chinese Physics Letters, 2020 - iopscience.iop.org
Very recently the LHCb collaboration reported their observation of the first two fully open-
flavor tetraquark states, the X 0 (2900) of JP= 0+ and the X 1 (2900) of JP= 1−. We study …

Amplitude analysis of and decays

R Aaij, ASW Abdelmotteleb, C Abellan Beteta… - Physical Review D, 2023 - APS
Resonant contributions in B 0→ D¯ D 0 s+ π-and B+→ DD s+ π+ decays are determined
with an amplitude analysis, which is performed both separately and simultaneously, where …

Decays of the fully open flavor state in a molecule scenario

ZL Yue, CJ Xiao, DY Chen - Physical Review D, 2023 - APS
Inspired by the recent observations of T cs¯ 0 0/++ in the processes B 0→ D¯ 0 D s+ π-and
B+→ DD s+ π+ by LHCb Collaboration, we investigate the decay properties of the T cs¯ 0 0 …

Observation of a New Excited Beauty Strange Baryon Decaying to

AM Sirunyan, A Tumasyan, W Adam, JW Andrejkovic… - Physical review …, 2021 - APS
The Ξ b-π+ π-invariant mass spectrum is investigated with an event sample of proton-proton
collisions at s= 13 TeV, collected by the CMS experiment at the LHC in 2016–2018 and …