nLab
pentaquark

Contents

Context

Fields and quanta

field (physics)

standard model of particle physics

force field gauge bosons

scalar bosons

matter field fermions (spinors, Dirac fields)

flavors of fundamental fermions in the
standard model of particle physics:
generation of fermions1st generation2nd generation3d generation
quarks (qq)
up-typeup quark (uu)charm quark (cc)top quark (tt)
down-typedown quark (dd)strange quark (ss)bottom quark (bb)
leptons
chargedelectronmuontauon
neutralelectron neutrinomuon neutrinotau neutrino
bound states:
mesonspion (udu d)
rho-meson (udu d)
omega-meson (udu d)
kaon (q u/dsq_{u/d} s)
eta-meson (u u + d d + s s)
B-meson (qbq b)
baryonsproton (uud)(u u d)
neutron (udd)(u d d)

(also: antiparticles)

effective particles

hadron (bound states of the above quarks)

solitons

minimally extended supersymmetric standard model

superpartners

bosinos:

sfermions:

dark matter candidates

Exotica

auxiliary fields

Contents

Idea

The pentaquark is a bound state of 5 quarks (as opposed to just 3 in baryons and 2 in mesons) which after a long history of theoretical prediction and inconclusive experimental signatures was finally observed beyond doubt by the LHCb collaboration.

References

Detection due to

  • LHCb collaboration, Observation of J/ψbJ/\psi b resonances consistent with pentaquark states in Λ b 0J/ψK p\Lambda^0_b \to J/\psi K^- p decays, Phys. Rev. Lett. 115, 072001 (2015) (arXiv:1507.03414)

Review in

See also

Discussion in AdS/QCD:

  • Kazuo Ghoroku, Akihiro Nakamura, Tomoki Taminato, Fumihiko Toyoda, Holographic Penta and Hepta Quark State in Confining Gauge Theories, JHEP 1008:007,2010 (arxiv:1003.3698)

Last revised on August 12, 2019 at 16:05:19. See the history of this page for a list of all contributions to it.