Odd and Even Partial Waves of $\eta\pi^-$ and $\eta'\pi^-$ in 191 GeV/c $\pi^{-}p$

In the year 2008 COMPASS recorded diffractive events of the signature \pi^-(191 GeV) p --> X_fast p. We present results of the analysis of the subsystems X = \eta(')\pi^-. Besides the known resonances a_2(1320), a_4(2040), we study the properties of the spin-exotic P+ wave, and all other nat...

Descripción completa

Detalles Bibliográficos
Autor principal: Schlüter, T.
Lenguaje:eng
Publicado: 2014
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.22323/1.205.0085
http://cds.cern.ch/record/1643379
_version_ 1780934990711750656
author Schlüter, T.
author_facet Schlüter, T.
author_sort Schlüter, T.
collection CERN
description In the year 2008 COMPASS recorded diffractive events of the signature \pi^-(191 GeV) p --> X_fast p. We present results of the analysis of the subsystems X = \eta(')\pi^-. Besides the known resonances a_2(1320), a_4(2040), we study the properties of the spin-exotic P+ wave, and all other natural-exchange partial waves up to spin J = 6. We find a striking difference between the two final states: whereas the even partial waves J = 2, 4, 6 in the two systems are related by phase-space factors, the odd partial waves are relatively suppressed in the \eta\pi^- system. The relative phases between the even waves appear identical whereas the phase between the D and P waves behave quite differently, suggesting different resonant and non-resonant contributions in the two odd-angular-momentum systems. Branching ratios and parameters of the well-known resonances a_2 and a_4 are measured.
id cern-1643379
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2014
record_format invenio
spelling cern-16433792022-08-10T20:12:51Zdoi:10.22323/1.205.0085http://cds.cern.ch/record/1643379engSchlüter, T.Odd and Even Partial Waves of $\eta\pi^-$ and $\eta'\pi^-$ in 191 GeV/c $\pi^{-}p$Particle Physics - ExperimentIn the year 2008 COMPASS recorded diffractive events of the signature \pi^-(191 GeV) p --> X_fast p. We present results of the analysis of the subsystems X = \eta(')\pi^-. Besides the known resonances a_2(1320), a_4(2040), we study the properties of the spin-exotic P+ wave, and all other natural-exchange partial waves up to spin J = 6. We find a striking difference between the two final states: whereas the even partial waves J = 2, 4, 6 in the two systems are related by phase-space factors, the odd partial waves are relatively suppressed in the \eta\pi^- system. The relative phases between the even waves appear identical whereas the phase between the D and P waves behave quite differently, suggesting different resonant and non-resonant contributions in the two odd-angular-momentum systems. Branching ratios and parameters of the well-known resonances a_2 and a_4 are measured.In the year 2008 COMPASS recorded diffractive events of the signature p ( 191 GeV ) p ! X fast p . We present results of the analysis of the subsystems X = h ( 0 ) p . Besides the known resonances a 2 ( 1320 ) , a 4 ( 2040 ) , we study the properties of the spin-exotic P + wave, and all other natural- parity exchange partial waves up to spin J = 6. We find a striking difference between the two final states: whereas the even partial waves 2, 4, 6 in the two systems are related by phase-space factors, the odd partial waves are relatively suppressed in the hp system. The relative phases between the even waves appear identical whereas the phase between the D and P waves behave quite differently, suggesting different resonant and non-resonant contributions in the two odd- angular-momentum systems. Branching ratios and parameters of the well-known resonances a 2 and a 4 are measured. We find m ( a 2 ) = 1315 12 MeV ; G ( a 2 ) = 119 14 MeV ; and m ( a 4 ) = 1900 + 80 20 MeV ; G ( a 4 ) = 300 + 80 100 MeV : (consistent with COMPASS’s 3 p analyses.) The relative branchings we measure are BR ( a 2 ! h 0 p ) BR ( a 2 ! hp ) = ( 5 2 ) % ; BR ( a 4 ! h 0 p ) BR ( a 4 ! hp ) = ( 23 7 ) %In the year 2008 COMPASS recorded diffractive events of the signature \pi^-(191 GeV) p --> X_fast p. We present results of the analysis of the subsystems X = \eta(')\pi^-. Besides the known resonances a_2(1320), a_4(2040), we study the properties of the spin-exotic P+ wave, and all other natural-exchange partial waves up to spin J = 6. We find a striking difference between the two final states: whereas the even partial waves J = 2, 4, 6 in the two systems are related by phase-space factors, the odd partial waves are relatively suppressed in the \eta\pi^- system. The relative phases between the even waves appear identical whereas the phase between the D and P waves behave quite differently, suggesting different resonant and non-resonant contributions in the two odd-angular-momentum systems. Branching ratios and parameters of the well-known resonances a_2 and a_4 are measured.arXiv:1401.4067oai:cds.cern.ch:16433792014-01-16
spellingShingle Particle Physics - Experiment
Schlüter, T.
Odd and Even Partial Waves of $\eta\pi^-$ and $\eta'\pi^-$ in 191 GeV/c $\pi^{-}p$
title Odd and Even Partial Waves of $\eta\pi^-$ and $\eta'\pi^-$ in 191 GeV/c $\pi^{-}p$
title_full Odd and Even Partial Waves of $\eta\pi^-$ and $\eta'\pi^-$ in 191 GeV/c $\pi^{-}p$
title_fullStr Odd and Even Partial Waves of $\eta\pi^-$ and $\eta'\pi^-$ in 191 GeV/c $\pi^{-}p$
title_full_unstemmed Odd and Even Partial Waves of $\eta\pi^-$ and $\eta'\pi^-$ in 191 GeV/c $\pi^{-}p$
title_short Odd and Even Partial Waves of $\eta\pi^-$ and $\eta'\pi^-$ in 191 GeV/c $\pi^{-}p$
title_sort odd and even partial waves of $\eta\pi^-$ and $\eta'\pi^-$ in 191 gev/c $\pi^{-}p$
topic Particle Physics - Experiment
url https://dx.doi.org/10.22323/1.205.0085
http://cds.cern.ch/record/1643379
work_keys_str_mv AT schlutert oddandevenpartialwavesofetapiandetapiin191gevcpip

Ejemplares similares