TY  - CONF
AU  - Lange, Sören
TI  - XYZ States - Results from Experiments
IS  - arXiv:1311.7594
CY  - Hamburg
PB  - Deutsches Elektronen-Synchrotron, DESY
M1  - PUBDB-2015-05835
M1  - arXiv:1311.7594
SP  - 195-214
PY  - 2014
AB  - Charmonium(-like) or bottomonium(-like) states, which are incompatible with predictions from a static quark anti-quark potential model, are often refered to as XYZ states. In this lecture, some peculiar properties of states such as the X(3872), the Y(4260), or the Zc(3900) are explained. Such properties are utmost proximity to a threshold, overpopulation of states, or possibly binding in the regime of string breaking. Among decays, the surprising observation of isospin violation, and using radiative decays for the observation of a D-wave state is discussed. A second part of the lecture presents recent precision measurements of masses of newly observed bottomonium states. These masses can be used for testing particular aspects of the potential, such as test of the tensor term or test of the flavor independence. At the end, an example is given, how future experiments may be able to measure widths of a charmonium(-like) state in the sub-MeV regime.
T2  - Helmholtz International School on Physics of Heavy Quarks and Hadrons
CY  - 15 Jul 2013 - 28 Jul 2013, Dubna (Russia)
Y2  - 15 Jul 2013 - 28 Jul 2013
M2  - Dubna, Russia
KW  - quark antiquark: potential model (INSPIRE)
KW  - quark antiquark: static (INSPIRE)
KW  - isospin: violation (INSPIRE)
KW  - charmonium: hadron spectroscopy (INSPIRE)
KW  - string model (INSPIRE)
KW  - bottomonium: hadron spectroscopy (INSPIRE)
KW  - quantum chromodynamics: perturbation theory (INSPIRE)
KW  - nonrelativistic (INSPIRE)
KW  - upsilon mesons: radiative decay (INSPIRE)
KW  - X(3872) (INSPIRE)
KW  - Y(4260) (INSPIRE)
KW  - B: hadronic decay (INSPIRE)
KW  - experimental results (INSPIRE)
LB  - PUB:(DE-HGF)8 ; PUB:(DE-HGF)15
DO  - DOI:10.3204/DESY-PROC-2013-03/Lange
UR  - https://bib-pubdb1.desy.de/record/292122
ER  -