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# A study of the sensitivity of the H dibaryon search experiment E813 at BNL through ([Sigma]S-,p)[subscript]a[subscript]t[subscript]o[subscript]m -&gt; [Lambda] + n

 dc.contributor.author Gan, Liping en_US dc.date.accessioned 2007-05-18T12:12:42Z dc.date.available 2007-05-18T12:12:42Z dc.date.issued 1998-04-07T00:00:00Z en_US dc.identifier.uri http://hdl.handle.net/1993/1571 dc.description.abstract This thesis is a study of the sensitivity of BNL experiment E813. Experiment E813 was a search for the H-Dibaryon (a six-quark uuddss state) at Brookhaven National Laboratory's 2-GeV/c beam line. It was insensitive to H decay modes and lifetime, and looked directly for H formation through a three step reaction mechanism. A liquid hydrogen target was used to produce $\Xi\sp-$ hyperons via the reaction $K\sp- + p \to K\sp+ +\Xi\sp-$. These $\Xi\sp-$'s were then slowed down in tungsten degraders so that a small fraction of them would stop in a liquid deuterium target located above the liquid hydrogen target to form a ($\Xi\sp-, d)\sb{atom}$. The signature for H formation via ($\Xi\sp-, d)\sb{atom}\to H + n$ would be a monoenergetic neutron in coincidence with the formation of a ($\Xi\sp-, d)\sb{atom}$. The most critical property of the experimental apparatus is the product of the hyperon stopping efficiency and the neutron detection efficiency, which is needed to quantitatively estimate the upper limit on the H formation branching ratio and to interpret the experimental results for the H particle search. This combined efficiency was calibrated with a similar three step reaction mechanism through a study of $\Sigma\sp-$ capture on hydrogen followed by ($\Sigma\sp-, p)\sb{atom}\to\Lambda + n$. The details of the calibration are discussed in this thesis. en_US dc.format.extent 8358288 bytes dc.format.extent 184 bytes dc.format.mimetype application/pdf dc.format.mimetype text/plain dc.language en en_US dc.language.iso en_US dc.rights info:eu-repo/semantics/openAccess dc.title A study of the sensitivity of the H dibaryon search experiment E813 at BNL through ([Sigma]S-,p)[subscript]a[subscript]t[subscript]o[subscript]m -> [Lambda] + n en_US dc.type info:eu-repo/semantics/doctoralThesis dc.degree.discipline Physics & Astronomy en_US dc.degree.level Doctor of Philosophy (Ph.D.) en_US
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