Contribution to a conference proceedings/Internal Report

PUBDB-2015-05835

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png XYZ States - Results from Experiments

Lange, S. (Corresponding author)

2014
Deutsches Elektronen-Synchrotron, DESY Hamburg

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Please use a persistent id in citations: doi:10.3204/DESY-PROC-2013-03/Lange

Report No.: arXiv:1311.7594

Abstract: 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.

Keyword(s): quark antiquark: potential model ; quark antiquark: static ; isospin: violation ; charmonium: hadron spectroscopy ; string model ; bottomonium: hadron spectroscopy ; quantum chromodynamics: perturbation theory ; nonrelativistic ; upsilon mesons: radiative decay ; X(3872) ; Y(4260) ; B: hadronic decay ; experimental results

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Contributing Institute(s):

1. Bibliothek und Dokumentation (L)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

Experiment(s):

1. Facility (machine) HERA

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Proceedings/Internal Report Ali, A. (Editor)DESY* ; Bystritskiy, Y. (Editor) ; Ivanov, M. (Editor)
Proceedings, Helmholtz International School on Physics of Heavy Quarks and Hadrons (HQ2013)
2014Helmholtz International School on Physics of Heavy Quarks and Hadrons , HQ2013, DubnaDubna, Russia, 15 Jul 2013 - 28 Jul 20132013-07-152013-07-28 Hamburg : Deutsches Elektronen-Synchrotron, DESY (2014) [10.3204/DESY-PROC-2013-03]2014     Files BibTeX | EndNote: XML, Text | RIS

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