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Measurement of negative chi baryon p...

Huang, Melin.

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Measurement of negative chi baryon polarization and decay parameters in negative chi baryon decays to lambda baryon and negative pion.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Measurement of negative chi baryon polarization and decay parameters in negative chi baryon decays to lambda baryon and negative pion./
Author:	Huang, Melin.
Description:	216 p.
Notes:	Adviser: Kenneth S. Nelson.
Contained By:	Dissertation Abstracts International64-03B.
Subject:	Physics, Elementary Particles and High Energy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3083116

Measurement of negative chi baryon polarization and decay parameters in negative chi baryon decays to lambda baryon and negative pion.
Huang, Melin.

Measurement of negative chi baryon polarization and decay parameters in negative chi baryon decays to lambda baryon and negative pion. - 216 p.

Adviser: Kenneth S. Nelson.

Thesis (Ph.D.)--University of Virginia, 2003.

This work describes an experimental study of the decay parameters, β Ξ and γΞ, and the polarization of Ξ<super> −</super> in Ξ<super>−</super> → Λπ<super>− </super> decay. An 800 GeV/<italic>c</italic> proton beam was used to produce Ξ<super> −</super> through the inclusive reaction <italic>p</italic> + <italic> Cu</italic> → Ξ<super>−</super> + <italic>X</italic>. Based on a total sample of 132 million polarized Ξ<super>−</super> after all event selection criteria, the polarization and the decays parameters of the Ξ<super>−</super> were measured. The Ξ<super>−</super> polarization showed an increase in magnitude with both Feynman <italic>x</italic> (<italic>xf</italic>) and transverse momentum (<italic>pt </italic>) with an average of −0.0360 ± 0.0005(<italic> stat</italic>.)<math> <f> <hsp sp="0.167">+0.0005<inf>-0.0002</inf></f> </math> (<italic>sys</italic>.) at a mean <italic>xf</italic> = 0.20 and <italic>pt</italic> = 0.46 GeV/<italic>c</italic>. With the direction and the magnitude, of the Ξ<super>−</super> polarization, the Ξ<super>−</super> decay parameters were measured to be βΞ = −0.080 ± 0.011<math> <f> <hsp sp="0.167">+0.016<inf>-0.004</inf></f> </math> and γΞ = 0.893 ± 0.010<math> <f> <hsp sp="0.167">+0.010<inf>-0.005</inf></f> </math>, yielding &phis;Ξ = tan<super>−1</super> (β Ξ/γΞ) = (−5.1 ± 0.7<math> <f> <hsp sp="0.167">+1.0<inf>-0.3</inf></f> </math>)° and the final-state Λπ strong phase shift difference δ<italic> p</italic>3 − δ<italic>s</italic> 3 = tan<super>−1</super> (βΞ/αΞ ) = (9.9 ± 1.3<math> <f> <hsp sp="0.167">-2.0<inf>+0.5</inf></f> </math>)°, where the first (second) error is the statistical (systematic) error.Subjects--Topical Terms:

1019488
Physics, Elementary Particles and High Energy.

Measurement of negative chi baryon polarization and decay parameters in negative chi baryon decays to lambda baryon and negative pion.
LDR:03092nam 2200253 a 45 001 935770
005 20110510
008 110510s2003 eng d
035 $a (UnM)AAI3083116
035 $a AAI3083116
040 $a UnM $c UnM
100 1 $a Huang, Melin. $3 1259475
245 1 0 $a Measurement of negative chi baryon polarization and decay parameters in negative chi baryon decays to lambda baryon and negative pion.
300 $a 216 p.
500 $a Adviser: Kenneth S. Nelson.
500 $a Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1308.
502 $a Thesis (Ph.D.)--University of Virginia, 2003.
520 $a This work describes an experimental study of the decay parameters, β Ξ and γΞ, and the polarization of Ξ<super> −</super> in Ξ<super>−</super> → Λπ<super>− </super> decay. An 800 GeV/<italic>c</italic> proton beam was used to produce Ξ<super> −</super> through the inclusive reaction <italic>p</italic> + <italic> Cu</italic> → Ξ<super>−</super> + <italic>X</italic>. Based on a total sample of 132 million polarized Ξ<super>−</super> after all event selection criteria, the polarization and the decays parameters of the Ξ<super>−</super> were measured. The Ξ<super>−</super> polarization showed an increase in magnitude with both Feynman <italic>x</italic> (<italic>xf</italic>) and transverse momentum (<italic>pt </italic>) with an average of −0.0360 ± 0.0005(<italic> stat</italic>.)<math> <f> <hsp sp="0.167">+0.0005<inf>-0.0002</inf></f> </math> (<italic>sys</italic>.) at a mean <italic>xf</italic> = 0.20 and <italic>pt</italic> = 0.46 GeV/<italic>c</italic>. With the direction and the magnitude, of the Ξ<super>−</super> polarization, the Ξ<super>−</super> decay parameters were measured to be βΞ = −0.080 ± 0.011<math> <f> <hsp sp="0.167">+0.016<inf>-0.004</inf></f> </math> and γΞ = 0.893 ± 0.010<math> <f> <hsp sp="0.167">+0.010<inf>-0.005</inf></f> </math>, yielding &phis;Ξ = tan<super>−1</super> (β Ξ/γΞ) = (−5.1 ± 0.7<math> <f> <hsp sp="0.167">+1.0<inf>-0.3</inf></f> </math>)° and the final-state Λπ strong phase shift difference δ<italic> p</italic>3 − δ<italic>s</italic> 3 = tan<super>−1</super> (βΞ/αΞ ) = (9.9 ± 1.3<math> <f> <hsp sp="0.167">-2.0<inf>+0.5</inf></f> </math>)°, where the first (second) error is the statistical (systematic) error.
590 $a School code: 0246.
650 4 $a Physics, Elementary Particles and High Energy. $3 1019488
690 $a 0798
710 2 0 $a University of Virginia. $3 645578
773 0 $t Dissertation Abstracts International $g 64-03B.
790 $a 0246
790 1 0 $a Nelson, Kenneth S., $e advisor
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3083116