Pentaquarks and tetraquarks at LHCb

Research output: Contribution to conferencePaperpeer-review

Abstract

Exotic resonant structures found in ?0b and B0 decays into charmonium in the LHCb experiment are discussed. Examination of the J/?p system in ?0b ? J/?K?p decays shows two states each of which must be composed of uudcc quarks, and thus are called charmonium pentaquarks. Their masses are 4380 ±8 ±29 MeV and 4449.8 ±1.7 ±2.5 MeV, and their corresponding widths (?) are 205 ±18 ±86 MeV, and 39 ±5 ±19 MeV. The preferred JP assignments are of opposite parity, with one state having spin 3/2 and the other 5/2. Models of internal binding of the pentaquark states are discussed. Finally, another mesonic state is discussed, the Z(4430)? that decays into ?0?? and was first observed by the Belle collaboration in B0 ? ?0K+?? decays. Using a sample of approximately 25,000 signal events, LHCb determines the JP to be 1+

Original languageEnglish (US)
StatePublished - 2020
Event2015 Meeting of the Division of Particles and Fields of the American Physical Society, DPF 2015 - Ann Arbor, United States
Duration: Aug 4 2015Aug 8 2015

Conference

Conference2015 Meeting of the Division of Particles and Fields of the American Physical Society, DPF 2015
CountryUnited States
CityAnn Arbor
Period8/4/158/8/15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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