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Title: {pi}-{xi} Correlations at RHIC

Abstract

We report on {pi}-{xi} correlation analysis in Au+Au collisions at {radical}(s{sub NN})=200 GeV and {radical}(s{sub NN})=62 GeV from year 2004 high statistics run of the STAR experiment at RHIC. Correlation analysis of {pi}-{xi} system is presented addressing independently the issue of flow of multi-strange baryons in heavy-ion collisions. We observe effects of both Coulomb and strong interactions in the {pi}-{xi} final state, the latter proceeding via {xi}*(1530) resonant interaction. The technique of spherical harmonics decomposition of the correlation function is used to study space-time separation of the pion and {xi} sources.

Authors:
 [1]
  1. Nuclear Physics Institute, Academy of Sciences of the Czech Republic, 250 68 Rez (Czech Republic)
Publication Date:
OSTI Identifier:
20800145
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 828; Journal Issue: 1; Conference: 35. internationals symposium on multiparticle dynamics; Workshop on particle correlations and femtoscopy, Kromeriz (Czech Republic), 9-17 Aug 2005; Other Information: DOI: 10.1063/1.2197477; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BROOKHAVEN RHIC; CORRELATION FUNCTIONS; CORRELATIONS; GEV RANGE; GOLD 197 REACTIONS; GOLD 197 TARGET; MULTIPARTICLE SPECTROMETERS; MULTIPLE PRODUCTION; PARTICLE IDENTIFICATION; PIONS; SPACE-TIME; STATISTICS; STRONG INTERACTIONS; XI-1530 BARYONS

Citation Formats

Chaloupka, Petr. {pi}-{xi} Correlations at RHIC. United States: N. p., 2006. Web. doi:10.1063/1.2197477.
Chaloupka, Petr. {pi}-{xi} Correlations at RHIC. United States. doi:10.1063/1.2197477.
Chaloupka, Petr. Tue . "{pi}-{xi} Correlations at RHIC". United States. doi:10.1063/1.2197477.
@article{osti_20800145,
title = {{pi}-{xi} Correlations at RHIC},
author = {Chaloupka, Petr},
abstractNote = {We report on {pi}-{xi} correlation analysis in Au+Au collisions at {radical}(s{sub NN})=200 GeV and {radical}(s{sub NN})=62 GeV from year 2004 high statistics run of the STAR experiment at RHIC. Correlation analysis of {pi}-{xi} system is presented addressing independently the issue of flow of multi-strange baryons in heavy-ion collisions. We observe effects of both Coulomb and strong interactions in the {pi}-{xi} final state, the latter proceeding via {xi}*(1530) resonant interaction. The technique of spherical harmonics decomposition of the correlation function is used to study space-time separation of the pion and {xi} sources.},
doi = {10.1063/1.2197477},
journal = {AIP Conference Proceedings},
number = 1,
volume = 828,
place = {United States},
year = {Tue Apr 11 00:00:00 EDT 2006},
month = {Tue Apr 11 00:00:00 EDT 2006}
}
  • The authors report the first observation of two Cabibbo-suppressed decay modes, {Xi}{sub c}{sup +} {yields} {Sigma}{sup +}{pi}{sup -}{pi}{sup +} and {Xi}{sub c}{sup +} {yields} {Sigma}{sup -} {pi}{sup +}{pi}{sup +}. They observe 56 {+-} 13 over a background of 21, and 23 {+-} 7 over a background of 12 events, respectively, for the signals. The data were accumulated using the SELEX spectrometer during the 1996-1997 fixed target run at Fermilab, chiefly from a 600 GeV/c {Sigma}{sup -} beam. The branching ratios of the decays relative to the Cabibbo-favored {Xi}{sub c}{sup +} {yields} {Xi}{sup -}{pi}{sup +}{pi}{sup +} are measured to be B({Xi}{submore » c}{sup +} {yields} {Sigma}{sup +}{pi}{sup -}{pi}{sup +})/B({xi}{sub c}{sup +} {yields} {Xi}{sup -} {pi}{sup +}{pi}{sup +}) = 0.50 {+-} 0.20, and B({Xi}{sub c}{sup +} {yields} {Sigma}{sup -}{pi}{sup +}{pi}{sup +})/B({Xi}{sub c}{sup +} {yields} {Xi}{sup -}{pi}{sup +}{pi}{sup +}) = 0.23 {+-} 0.11, respectively. They also report branching ratios for the same decay modes of the {Lambda}{sub c}{sup +} relative to {Lambda}{sub c}{sup +} {yields} pK{sup -}{pi}{sup +}.« less
  • We present results for the strong widths corresponding to the {sigma}{sub c}{yields}{lambda}{sub c}{pi}, {sigma}{sub c}*{yields}{lambda}{sub c}{pi} and {xi}{sub c}*{yields}{xi}{sub c}{pi} decays. The calculations have been done in a nonrelativistic constituent quark model with wave functions that take advantage of the constraints imposed by heavy quark symmetry. Partial conservation of axial current hypothesis allows us to determine the strong vertices from an analysis of the axial current matrix elements. Our results {gamma}({sigma}{sub c}{sup ++}{yields}{lambda}{sub c}{sup +}{pi}{sup +})=2.41{+-}0.07{+-}0.02 MeV, {gamma}({sigma}{sub c}{sup +}{yields}{lambda}{sub c}{sup +}{pi}{sup 0})=2.79{+-}0.08{+-}0.02 MeV, {gamma}({sigma}{sub c}{sup 0}{yields}{lambda}{sub c}{sup +}{pi}{sup -})=2.37{+-}0.07{+-}0.02 MeV, {gamma}({sigma}{sub c}*{sup ++}{yields}{lambda}{sub c}{sup +}{pi}{sup +})=17.52{+-}0.74{+-}0.12 MeV, {gamma}({sigma}{sub c}*{supmore » +}{yields}{lambda}{sub c}{sup +}{pi}{sup 0})=17.31{+-}0.73{+-}0.12 MeV, {gamma}({sigma}{sub c}*{sup 0}{yields}{lambda}{sub c}{sup +}{pi}{sup -})=16.90{+-}0.71{+-}0.12 MeV, {gamma}({xi}{sub c}*{sup +}{yields}{xi}{sub c}{sup 0}{pi}{sup +}+{xi}{sub c}{sup +}{pi}{sup 0})=3.18{+-}0.10{+-}0.01 MeV, and {gamma}({xi}{sub c}*{sup 0}{yields}{xi}{sub c}{sup +}{pi}{sup -}+{xi}{sub c}{sup 0}{pi}{sup 0})=3.03{+-}0.10{+-}0.01 MeV are in good agreement with experimental determinations.« less
  • We report the measurement of new modes of the charmed baryon [Lambda][sub [ital c]][sup +] using data recorded by the CLEO II detector at the Cornell Electron Storage Ring. We find branching ratios, relative to [Lambda][sub [ital c]][sup +][r arrow][ital pK][sup [minus]][pi][sup +], of 0.070[plus minus]0.011[plus minus]0.011 for [Lambda][sub [ital c]][sup +][r arrow][Sigma][sup +][ital K+][ital K[minus]], 0.069[plus minus]0.023[plus minus]0.016 for [Lambda][sub [ital c]][sup +][r arrow][Sigma][phi], 0.078[plus minus]0.013[plus minus]0.013 for [Lambda][sub [ital c]][sup +][r arrow][Xi][sup 0][ital K+], and 0.053[plus minus]0.016[plus minus]0.010 for [Lambda][sub [ital c]][sup +][r arrow][Xi][sup *0][ital K+]. These measurements indicate that [ital W]-exchange diagrams contribute to [Lambda][sub [ital c]][supmore » +] decay. We have also made a new measurement of the previously found mode [Lambda][sub [ital c]][sup +][r arrow][Xi][sup [minus]][ital K+][pi][sup +].« less