BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Light exotic meson candidates in COMPASS - Bernhard Ketzer (Rheini
 sche Friedrich-Wilhelms-Universität Bonn)
DTSTART:20171110T160000Z
DTEND:20171110T170000Z
UID:TALK93547@talks.cam.ac.uk
CONTACT:Dr Maria Ubiali
DESCRIPTION:In recent years\, the spectroscopy of hadrons containing heavy
  quarks has brought forward a plethora of new and unexpected resonance-lik
 e signals. Many of these so-called X\,Y\,Z states are candidates for state
 s beyond the quark-antiquark or three-quark configurations of mesons and b
 aryons\, respectively\, which have been sought after since the introductio
 n of the quark model. Similar studies in the light-quark sector are more c
 hallenging due to the wide and overlapping nature of known resonances\, bu
 t are also expected to give easier access to hadrons with explicit gluonic
  degrees of freedom\, so-called hybrids. Recently\, lattice QCD started to
  make predictions on the multiplet structure of exotic hadrons\, which may
  be used as a guideline in the experimental searches.\n\nThe COMPASS exper
 iment at CERN uses a high-energy pion beam scattered off protons and heavi
 er nuclei to produce mesonic excitations\, which are observed in multi-par
 ticle final states subjected to partial-wave analyses. In addition to stud
 ying the properties of established mesons with unprecedented accuracy\, th
 e large existing data samples allow us to detect possibly exotic states. T
 hese either do not fit current theoretical expectations\, like the recentl
 y observed a1(1420)\, or carry spin-exotic quantum numbers\, like the pi1(
 1600). The talk will give an update on ongoing studies of these states inv
 olving novel analysis techniques and discuss possible interpretations.
LOCATION:MR19 (Potter Room\, Pavilion B)\, CMS
END:VEVENT
END:VCALENDAR