"Here we report the first measurement of quantum numbers of the recently discovered family of three all-charm tetraquarks30,31,32, using data collected by the CMS experiment at the Large Hadron Collider from 2016 to 2018 (refs.33,34). The angular analysis techniques developed for the discovery and characterization of the Higgs boson35,36,37 have been applied to the new exotic states. Here we show that the quantum numbers for parity P and charge conjugation C symmetries are found to be +1."
"The angular analysis techniques developed for the discovery and characterization of the Higgs boson35,36,37 have been applied to the new exotic states. The spin J of these exotic states is determined to be consistent with 2, while 0 and 1 are excluded at 95% and 99% confidence levels, respectively. The JPC=2++ assignment implies particular configurations of constituent spins and orbital angular momenta, which constrain the possible internal structure of these tetraquarks."
Measurements using CMS data collected from 2016 to 2018 determined quantum numbers of a family of three all-charm tetraquarks. Angular analysis methods from Higgs boson studies were applied to characterize the exotic states. Parity P and charge conjugation C are both measured to be +1. The spin J is consistent with 2, with spin 0 excluded at 95% confidence and spin 1 excluded at 99% confidence. The JPC = 2++ assignment implies specific combinations of constituent spins and orbital angular momenta, thereby constraining possible internal structures and informing theoretical models of multiquark states.
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