Experimental constraints on the possible J^PC quantum numbers of the\n X(3872)

2005/05/13 by K. Abe, Abe, K., Kazuo Abe · 8 citations
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.hep-ex/0505038

openalex publication_date 2005/05/13 · openalex created_date 2019/07/30 · openalex updated_date 2026/07/28

Abstract

We examine possible J^PC quantum number assignments for the X(3872). Angular\ncorrelations between final state particles in X(3872) --> pi+pi- J/psi decays\nare used to rule out J^PC values of 0++ and 0-+. The shape of the pi+pi- mass\ndistribution near its upper kinematic limit favors S-wave over P-wave as the\nrelative orbital angular momentum between the final-state dipion and J/psi,\nwhich strongly disfavors 1-+ and 2-+ assignments. The accumulated evidence\nstrongly favors a J^PC = 1++ assignment for the X(3872), although the 2++\npossibility is not ruled out by tests reported here. The analysis is based on a\nsample of X(3872) mesons produced via the exclusive process B --> K X(3872) in\na 256 fb-1 data sample collected at the Upsilon(4S) resonance in the Belle\ndetector at the KEKB collider.\n

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