منابع مشابه
Lattice QCD Evidence for Exotic Tetraquark Resonance
We study the manifestly exotic tetraquark D s0 cus̄d̄ and the scalar tetraquark f0 udūd̄ in SU(3)c anisotropic quenched lattice QCD. We adopt the O a -improved Wilson (clover) fermion at β 5 75 on 123 96 with renormalized anisotropy as at 4, and investigate the correlator of the four-quark (4Q) system, cus̄d̄, with various quark masses including the idealized SU(4) f case. For f0 udūd̄ etc., we only ...
متن کاملOn tetraquark meson states
It is suggested that the narrow meson state seen in the the SELEX experiment is a (cs̄ss̄) tetraquark state. Characteristics of other possible tetraquarks formed out of c and s quarks and antiquarks are considered. SELEX experiment has reported [1] a puzzling narrow meson state at a mass of 2632.6± 1.6 MeV/c which decays preferentially to D s (cs̄) + η(548) rather than to D(cd̄)+K or D(cū)+K. In th...
متن کاملElusive Exotic States
The existence of flavor exotic QQq̄q̄ molecular-type states is investigated. An attractive force between two pseudoscalar H = (Qq̄) heavy meson is generated by (correlated) two-pion exchange. The emergence of a (loosely) bound state depends crucially on the value of the coupling constant g of the H∗Hπ vertex. For a g value calculated from the experimental upper limit on the width of the D∗ meson t...
متن کاملExotic Hadronic States at Hera
The hadronic states studied in hadron spectroscopy have been successfully explained by quark-antiquark states (mesons) or three quark states (baryons). States whose quantum numbers could be understood in terms of more complex quark structures were up to now not observed. Such exotic states were already proposed on the basis of quark and bag models [1] in the early days of QCD, with the hope tha...
متن کاملExotic QQqq States in QCD
We show that QCD contains stable four-quark QQqq hadronic states in the limit where the heavy quark mass goes to infinity. (Here Q denotes a heavy quark, q a light antiquark and the stability refers only to the strong interactions.) The long range binding potential is due to one pion exchange between ground state Qq mesons, and is computed using chiral perturbation theory. For the Q = b, this l...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 2019
ISSN: 2470-0010,2470-0029
DOI: 10.1103/physrevd.99.014025