skip to main content

Title: Recent COMPASS results and future prospects for ALICE

The COMPASS Collaboration has accumulated the world’s highest statistics on the reaction π{sup −} p → π{sup +}π{sup −}π{sup −} p at 190 GeV/c. The results, presented in Section 1, show that a new state J{sup PC} = 1{sup ++} state never reported before, the a{sub 1}(1420), decaying to f{sub 0}(980)π followed by f{sub 0}(980) → ππ. In addition, the Collaboration reports an exotic J{sup PC} = 1{sup −+} state, the π{sub 1}(1600), which cannot be a quarkonium. Both states are likely to be a tetra-quark, i.e. qq{sup ¯}+qq{sup ¯} or a gluonic hybrid, a qq{sup ¯} object with an excited gluon inside it. Section 2 is devoted to a brief discussion of the central production of resonances, which is being investigated by both COMPASS and ALICE collaborations. However, the results are not yet released, so it is limited to a broad discussion of the central production, with emphasis on different analyses dictated by differences in the experimental setup.
Authors:
 [1] ;  [2] ;  [3]
  1. Physics Department, Brookhaven National Laboratory, Upton, NY 11973 (United States)
  2. (Korea, Republic of)
  3. (E18), Technische Universität München (Germany)
Publication Date:
OSTI Identifier:
22391361
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1654; Journal Issue: 1; Conference: DIFFRACTION 2014: International Workshop on Diffraction in High-Energy Physics, Primosten (Croatia), 10-16 Sep 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; F0-980 MESONS; GEV RANGE; GLUONS; MULTIPARTICLE SPECTROMETERS; MULTIPLE PRODUCTION; PARTICLE DECAY; PARTICLE IDENTIFICATION; PI-1770 MESONS; PION MINUS REACTIONS; PION-PROTON INTERACTIONS; PIONS MINUS; PIONS PLUS; PROTONS; QUARKONIUM; QUARKS; STATISTICS