LHCb discovers a new type of tetraquark

The LHCb collaboration has observed a type of four-quark particle never seen before. It is the first observation of a so called tetraquark with four heavy quarks of the same type, specifically two charm quarks and two charm antiquarks
The LHCb Collaboration has released new results which can be interpreted as the discovery of a new type of tetraquark particle, made from two charm quarks and two charm antiquarks. This is the first time an exotic hadron has been found made exclusively of heavy quarks of the same flavour.
The tetraquark candidate was found by its decay into two J/ψ mesons, each of which is made from a charm quark and charm antiquark. The plot shows a narrow structure peaking near 6900 MeV/c2 in the invariant mass of the pair of J/ψ mesons which is interpreted as the new particle.
The decay of the new particle into the J/ψ pair suggests a minimum quark content of two charm quarks and two anticharm quarks, consistent with a tetraquark interpretation.
This news follows the discovery of the first two pentaquark particles by the LHCb collaboration last year.
More information on the tetraquark results is available on the LHCb website and in the two submitted scientific papers (see here and here).
More news
- Highly Cited Scientists 2020
- Laura Baudis - Breaking the Wall with Dark Matter
- Congratulations to Alison Mitchell
- In Memoriam: Prof. Dr. Günter Scharf, Professor Emeritus for theoretical physics
- Observation of Excess Events in XENON1T
- Congratulations to Carlos Abellan Beteta
- SPG Thesis Award for Frank Schindler
- New Publication Group Natterer
- Prof. Em. Dr. Peter Truöl, Professor Emeritus for Elementary Particle Physics, has passed away
- Annual Report 2019
- LHCb: new angular analysis confirms old puzzle
- Two-flavor superconductivity
- Machine Learning Workshop, postponed
- Unusual coupling in an artificial material