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000292122 088__ $$2arXiv$$aarXiv:1311.7594
000292122 1001_ $$0P:(DE-HGF)0$$aLange, Sören$$b0$$eCorresponding author
000292122 1112_ $$aHelmholtz International School on Physics of Heavy Quarks and Hadrons$$cDubna$$d2013-07-15 - 2013-07-28$$gHQ2013$$wRussia
000292122 245__ $$aXYZ States - Results from Experiments
000292122 260__ $$aHamburg$$bDeutsches Elektronen-Synchrotron, DESY$$c2014
000292122 300__ $$a195-214
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000292122 520__ $$aCharmonium(-like) or bottomonium(-like) states, which are incompatible with predictions from a static quark anti-quark potential model, are often refered to as XYZ states. In this lecture, some peculiar properties of states such as the X(3872), the Y(4260), or the Zc(3900) are explained. Such properties are utmost proximity to a threshold, overpopulation of states, or possibly binding in the regime of string breaking. Among decays, the surprising observation of isospin violation, and using radiative decays for the observation of a D-wave state is discussed. A second part of the lecture presents recent precision measurements of masses of newly observed bottomonium states. These masses can be used for testing particular aspects of the potential, such as test of the tensor term or test of the flavor independence. At the end, an example is given, how future experiments may be able to measure widths of a charmonium(-like) state in the sub-MeV regime.
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000292122 650_7 $$2INSPIRE$$aquark antiquark: potential model
000292122 650_7 $$2INSPIRE$$aquark antiquark: static
000292122 650_7 $$2INSPIRE$$aisospin: violation
000292122 650_7 $$2INSPIRE$$acharmonium: hadron spectroscopy
000292122 650_7 $$2INSPIRE$$astring model
000292122 650_7 $$2INSPIRE$$abottomonium: hadron spectroscopy
000292122 650_7 $$2INSPIRE$$aquantum chromodynamics: perturbation theory
000292122 650_7 $$2INSPIRE$$anonrelativistic
000292122 650_7 $$2INSPIRE$$aupsilon mesons: radiative decay
000292122 650_7 $$2INSPIRE$$aX(3872)
000292122 650_7 $$2INSPIRE$$aY(4260)
000292122 650_7 $$2INSPIRE$$aB: hadronic decay
000292122 650_7 $$2INSPIRE$$aexperimental results
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000292122 773__ $$a10.3204/DESY-PROC-2013-03/Lange
000292122 7870_ $$0PUBDB-2015-05817$$aAli, Ahmed et.al.$$dDeutsches Elektronen-Synchrotron, DESY, Hamburg, 2014$$iIsPartOf$$rDESY-PROC-2013-03$$tProceedings, Helmholtz International School on Physics of Heavy Quarks and Hadrons (HQ2013)
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