TY  - JOUR
A1  - Meinel, Stefan
A1  - Pflaumer, Martin
A1  - Wagner, Marc
T1  - Search for b̄b̄us and b̄c̄ud tetraquark bound states using lattice QCD
T2  - Physical review. D : covering particles, fields, gravitation, and cosmology
N2  - We use lattice QCD to investigate the existence of strong-interaction-stable antiheavy-antiheavy-light-light tetraquarks. We study the ¯𝑏¯𝑏⁢𝑢⁢𝑠 system with quantum numbers 𝐽𝑃=1+ as well as the ¯𝑏¯𝑐⁢𝑢⁢𝑑 systems with quantum numbers 𝐼⁡(𝐽𝑃)=0⁢(0+) and 𝐼⁡(𝐽𝑃)=0⁢(1+). We carry out computations on five gauge-link ensembles with 2+1 flavors of domain-wall fermions, including one at the physical pion mass. The bottom quarks are implemented using lattice nonrelativistic QCD, and the charm quarks using an anisotropic clover action. In addition to local diquark-antidiquark and local meson-meson interpolating operators, we include nonlocal meson-meson operators at the sink, which facilitates the reliable determination of the low-lying energy levels. We find clear evidence for the existence of a strong-interaction-stable ¯𝑏⁢¯𝑏⁢𝑢⁢𝑠 tetraquark with binding energy (−86±22±10)  MeV and mass (10609±22±10)  MeV. For the ¯𝑏¯𝑐⁢𝑢⁢𝑑 systems we do not find any indication for the existence of bound states, but cannot rule out their existence either.
Y1  - 2022
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/85905
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-859052
SN  - 2470-0029
SN  - 2470-0010
VL  - 106
IS  - 3, 034507
PB  - American Physical Society
CY  - Ridge, NY
ER  -