Abstract
The non-strange baryon spectrum has been mapped out predominantly by studying N π elastic scattering with phase-shift analysis as the tool of choice. While there has been much success with these experimental techniques, the results have fueled debates in the community, most notably regarding the missing baryons problem. Theoretical solutions to this discrepancy appeal to a diquark-system within the baryons or a coupling to states other than N π. The CLAS detector at Jefferson Lab has turned out high-statistics, photoproduction datasets which are optimal for resolving these issues. However, new analytical techniques may be required to deal with this rich physics sector. The baryon resonances are photoproduced off liquid hydrogen and the CLAS detector allows us to measure a variety of final states. We will have access to nπ +, pπ 0, pπ + π −, pω,pη, pη′, ΛK + and ΣK + final states. A robust software package has been developed that allows for the fitting of these states individually and in a coupled-channel mode. We make use of flexible C++ based tools that allow fast and general calculations of amplitudes based on a covariant tensor formalism. New techniques have been applied to background subtraction which brings an added level of consistency to the analysis. Polarization information from other experiments is incorporated at fit time to help distinguish potentially ambiguous physics processes by using information outside of the CLAS datasets. Some of these channels have more mature analysis (pω,ΛK +) and the preliminary measuremen will be shown as well as an overview of the analysis tools.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
D.B. Lichtenberg, Phys. Rev. 178, 2197 (1969).
Roman Koniuk, Nathan Isgur, Phys. Rev. D 21, 1868 (1980).
Simon Capstick, Winston Roberts, Phys. Rev. D 47, 1994 (1993).
Simon Capstick, Winston Roberts, Phys. Rev. D 49, 4570 (1994).
Simon Capstick, Nathan Isgur, Phys. Rev. D 34, 2809 (1986).
B.A. Mecking et al., Nucl. Instrum. Methods A 503, 513 (2003).
D.I. Sober et al., Nucl. Instrum. Methods A 440, 263 (2000).
R.A. Arndt, I.I. Strakovsky, R.L. Workman. Int. J. Mod. Phys. A 18, 449 (2003).
Lothar Tiator, Sabit Kamalov, Maid analysis techniques, 2006.
W. Rarita, Julian S. Schwinger, Phys. Rev. 60, 61 (1941).
A. Anisovich, E. Klempt, A. Sarantsev, U. Thoma, Eur. Phys. J. A 24, 111 (2005).
Robert Bradford, Reinhard Schumacher, Measurements of c(z) and c(x) for k+ lambda and k+ sigma0 photoproduction, 2006.
M. Guidal, J.M. Laget, M.Vanderhaeghen, Phys. Lett. B 400, 6 (1997).
Stijn Janssen, Jan Ryckebusch, Dimitri Debruyne, Tim Van Cauteren, Phys. Rev. C 65, 015201 (2002).
R.A. Adelseck, B. Saghai, Phys. Rev. C 42, 108 (1990).
K. Schilling, P. Seyboth, G. Wolf, Nucl. Phys. B 15, 398 (1970).
J. Barth et al., Eur. Phys. J. A 18, 117 (2003).
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2008 Società Italiana di Fisica / Springer-Verlag
About this paper
Cite this paper
Bellis, M., Krahn, Z., McCracken, M., Meyer, C., Williams, M. (2008). Current status of a coupled-channel partial wave analysis using data from CLAS at Jefferson Lab. In: Hammer, HW., Kleber, V., Thoma, U., Schmieden, H. (eds) NSTAR 2007. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85144-8_23
Download citation
DOI: https://doi.org/10.1007/978-3-540-85144-8_23
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-85143-1
Online ISBN: 978-3-540-85144-8
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)