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| Release | : 2006 |
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| Total Pages | : 924 |
| Release | : 2007 |
| Genre | : Dissertations, Academic |
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| Total Pages | : 276 |
| Release | : 2002 |
| Genre | : Nuclear physics |
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Vols. 1, 6, 8-9, 11, 13- consist of Proceedings of the International School of Nuclear Physics.
| Author | : Vincenzo Lia |
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| Total Pages | : 135 |
| Release | : 2000 |
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We have performed a measurement of transverse polarization for A baryons produced after the collision of longitudinally polarized electrons and unpolarized positrons at the Z0 resonance. The measurement is based on 560,000 Z0 decays produced at the SLC and collected by the SLD collaboration at SLAC between 1993 and 1998. We define the axis of polarization as the cross product of the thrust axis direction and the [Lambda] momentum and we use the longitudinal polarization of the incoming electrons to sign the thrust axis according to the direction of the color field, thereby testing the Andersson-Gustavson-Ingelman model for [Lambda] transverse polarization. We find that if the mechanism responsible for [Lambda] transverse polarization is completely correlated with the color field direction -0.22% (P[Lambda])[perpendicular]
| Author | : HERMES Collaboration |
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| Release | : 2009 |
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| Total Pages | : 23 |
| Release | : 2008 |
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| Author | : Gregory Leif Rakness |
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| Total Pages | : 394 |
| Release | : 2000 |
| Genre | : Nuclear spin |
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| Author | : Jens-Ole Hansen |
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| Total Pages | : 145 |
| Release | : 1995 |
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| Release | : 2004 |
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The CLAS collaboration at JLab has recent results on[Lambda] polarization for both electroproduction and photoproduction of K[sup+][Lambda] exclusive states. I note the striking phenomenological trends in the data and discuss the underlying physics which might give rise to these phenomena; both in the context of an e.ective Lagrangian formalism, where the degrees of freedom are intermediate mesons and baryons, and also in the context of a simple quark picture. The quark model argument leads to the conclusion that the s and[bar s] quarks are produced with spins anti-aligned, in apparent contradiction to the popular[sup 3]P[sub 0] model of quark pair creation in which the pair is created with vacuum quantum numbers (J=0 and positive parity), i.e. in an S=1, L=1, J=0 angular momentum state.
| Author | : Mac Mestayer |
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| Release | : 2004 |
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I present recent results from the CLAS collaboration on Lambda and Sigma^0 polarization for both electroproduction and photoproduction of K^+Lambda and K^+Sigma^0 exclusive states. I interpret these data using a simple quark model, leading to the surprising conclusion that the s and s(pol) quarks are produced with spins anti-aligned, in apparent contradiction to the popular ^3P_0 model of quark pair creation.
