Polarization Observables in Hyperon Photoproduction with CLAS Craig Paterson University of Glasgow Eurotag Workshop Glasgow, 1 st September 2008.

Slides:

Advertisements

Similar presentations

Polarisation Observables for Strangeness Photoproduction on a Frozen Spin Target with CLAS at Jefferson Lab Stuart Fegan Nuclear Physics Group University.

Advertisements

Jefferson Lab and the 12GeV Upgrade Nuclear Physics UK Community Meeting Coseners House 11 th & 12 th June 2009 Ken Livingston, University of Glasgow Overview.

Introduction Glasgow’s NPE research Group uses high precision electromagnetic probes to study the subatomic structure of matter. Alongside this we are.

16 March 2009 EuNPC, Bochum 0 Kaon Photoproduction Results from CLAS D. G. Ireland.

G measurement at Ken Livingston, University of Glasgow, Scotland Slides from: Ken Livingston: Various talks at -

 photoproduction with linearly polarized photons at SPring-8 SENDAI03 16 th June, 2003 Tsutomu Mibe (Research Center for Nuclear Physics, Osaka univ.,

1 K* Photoproduction off the proton at CLAS via Ishaq Hleiqawi OHIO UNIVERSITY NSTAR2005 Oct. 12, 2005.

1 Study of N* excitations in 2-pion production. 2 Analysis of  +  - p single differential cross-sections.  p  -  ++ p+0p+0 pppp 

C x and C x for K + Λ and K +  o Photo-production R. Bradford Department of Physics and Astronomy, University of Rochester R. Schumacher Department of.

Experimental requirements for GPD measurements at JLab energies. Detector that ensures exclusivity of process, measurement of complete final state Measure.

Roberto Francisco Pérez Benito On behalf the HERMES Collaboration European Graduate School Lecture Week on Hadron Physics Jyväskylä, Aug 25-29, 2008 HERMES.

 Transverse Polarization in STAR Au-Au Collisions Polarization definition and models E896 results STAR analysis STAR results Significance of results Future.

Working Group on e-p Physics A. Bruell, E. Sichtermann, W. Vogelsang, C. Weiss Antje Bruell, JLab EIC meeting, Hampton, May Goals of this parallel.

Study of two pion channel from photoproduction on the deuteron Lewis Graham Proposal Phys 745 Class May 6, 2009.

Proton polarization measurements in π° photo-production --On behalf of the Jefferson Lab Hall C GEp-III and GEp-2γ collaboration Wei Luo Lanzhou University.

Coherent  -meson Photo-production from Deuterons Near Threshold Wen-Chen Chang Wen-Chen Chang for LEPS collaboration Institute of Physics, Academia Sinica,

T.C. Jude D.I. Glazier, D.P. Watts The University of Edinburgh Strangeness Photoproduction: Polarisation Transfer & Cross-Section Measurements.

Polarisation transfer in hyperon photoproduction near threshold Tom Jude D I Glazier, D P Watts The University of Edinburgh.

T.C. Jude D.I. Glazier, D.P. Watts The University of Edinburgh Strangeness Photoproduction At Threshold Energies.

Recoil Polarimetry in Meson Photoproduction at MAMI Mark Sikora, Derek Glazier, Dan Watts School of Physics, University of Edinburgh, UK Introduction The.

Working Group C: Hadronic Final States David Milstead The University of Liverpool Review of Experiments 27 experiment and 11 theory contributions.

K +  photoproduction with the Crystal Ball at MAMI T.C. Jude The University of Edinburgh New method of K + detection with the Crystal Ball Extraction.

Workshop on LEPS/SPring-8 new beamline, 28~29 July 2005, RCNP, Japan  + photoproduction with vector K* (including other recent results) Seung-il Nam *1,2.

Motivation. Why study ground state hyperon electroproduction? CLAS detector and analysis. Analysis results. Current status and future work. M. Gabrielyan.

Calibration of the new Particle Identification Detector (PID) Tom Jude, Derek Glazier, Dan Watts.

Neutral pion photoproduction and neutron radii Dan Watts, Claire Tarbert University of Edinburgh Crystal Ball and A2 collaboration at MAMI Eurotag Meeting.

Baryon Spectroscopy: Recent Results and Impact – , Erice R. Beck HISKP, University of Bonn Introduction Impact of the new Polarization.

Jefferson Lab and the 12GeV Upgrade Nuclear Physics UK Community Meeting Cosener’s House 11 th & 12 th June 2009 Ken Livingston, University of Glasgow.

Magnetic moments of baryon resonances Teilprojekt A3 Volker Metag II. Physikalisches Institut Universität Giessen Germany SFB/TR16 Mitgliederversammlung.

K +  and K +  0 photoproduction at SPring-8/LEPS Mizuki Sumihama Department of physics Osaka Univ. for LEPS collaboration 1. Introduction 2. Experiment.

1 Tomoaki Hotta (RCNP, Osaka Univ.) for The LEPS Collaboration Cracow Epiphany Conference, Jan 6, 2005 Introduction LEPS experiment Results from new LD.

Recent progress in N* physics from Kaon photoproduction experiments at CLAS using polarization observabes. The Rutherford Centennial Conference on Nuclear.

Dan Watts (Edinburgh), Igor Strakovsky (GWU) and the CLAS Collaboration Daria Sokhan New Measurement of Beam Asymmetry from Pion Photoproduction on the.

FROST: Status of  p -> K +  analysis Liam Casey Catholic University of America Adviser: Dr. Franz Klein.

Λ and Σ photoproduction on the neutron Pawel Nadel-Turonski The George Washington University for the CLAS Collaboration.

Baryon spectroscopy: recent Kaon photoproduction results from CLAS EINN2009, Sep2009, Milos Island, Greece Ken Livingston, University of Glasgow Motivation.

Kaon Production on the Nucleon D. G. Ireland MENU Rome, September 30 – October 4, 2013.

N* analysis at the Excited Baryon Analysis Center of JLab Hiroyuki Kamano (EBAC, Jefferson Lab) CLAS12 2 nd European Workshop, March 7-11, Paris, France.

N* analysis at the Excited Baryon Analysis Center of JLab Hiroyuki Kamano (EBAC, Jefferson Lab) CLAS12 2 nd European Workshop, March 7-11, Paris, France.

Beijing, Sept 2nd 2004 Rachele Di Salvo Beam asymmetry in meson photoproduction on deuteron targets at GRAAL MENU2004 Meson-Nucleon Physics and the Structure.

Status of Beam Asymmetry Measurements for Meson Photoproduction ASU Meson Physics Group Hadron Spectroscopy WG Meeting – June 2009 Status of Beam Asymmetry.

**PhD Dec (CLAS Analysis Note). OZI evading/respecting process 49.2 ± 0.6 % 34 ± 0.5 % Experimentally this decay mode is (15.3 ± 0.4) % mode is.

HLAB meeting paper 2011/1/18 T.Gogami CLAS ( CEBAF Large Acceptance Spectrometer ) Clam shell is open.

Photoproduction of the  (1385) resonance at LEPS K. Hicks & D. Keller, Ohio U. LEPS Collaboration Meeting May 1, 2008.

K* photoproduction from g11 K. Hicks Ohio University HSG meeting, 12 June 2009.

Polarisation transfer in hyperon photoproduction near threshold Tom Jude D I Glazier, D P Watts The University of Edinburgh.

Georgie Mbianda 1 for the Baryon (E01-002) Collaboration 1 University of the Witwatersrand, Johannesburg Exclusive Electroproduction of π + and η mesons.

Simultaneous photo-production measurement of the  and  mesons on the nucleons at the range 680 – 1500 MeV N.Rudnev, V.Nedorezov, A.Turinge for the GRAAL.

Overview of recent photon beam runs at CLAS CLAS12 European Workshop, Feb , Genoa, Italy Ken Livingston, University of Glasgow Tagged photons.

Fabien Zehr Double π photoproduction Glasgow 28 March 2006 Double π photoproduction at threshold and in the second resonance region With Crystal Ball and.

Polarisation Observables for Strangeness Photoproduction on a Frozen Spin Target with CLAS at Jefferson Lab Stuart Fegan Nuclear Physics Group University.

Timelike Compton Scattering at JLab

Polarisation Observables from Strangeness Photoproduction on a Frozen Spin Target with CLAS at Jefferson Lab Stuart Fegan Nuclear Physics Group Seminar.

Photon Asymmetries for K Production on the Deuteron

Hyperon production and polarization with CLAS at JLab

Status of the "direct" photon reconstruction

Overview of recent photon beam runs at CLAS

Analysis Report Haiyun Lu.

CLAS: A Wide-angle Lens for Hadronic Physics

L*(1520) Photoproduction off Proton and Neutron from CLAS eg3 data set

A Tale of Two (Toy) Models

K0S and L production at ZEUS

Overview on hard exclusive production at HERMES

The np -> d p0 reaction measured with g11 data

The data status on p+p-p photo/electroproduction with the CLAS

Status of Recoil Polarimeter

Curtis A Meyer Carnegie Mellon University

Mark Sikora, Dan Watts, Derek Glazier

Proposal for an Experiment: Photoproduction of Neutral Kaons on Deuterium Spokespersons: D. M. Manley (Kent State University) W. J. Briscoe (The George.

The Q+ Pentaquark Search at HERMES Wolfgang Lorenzon Collaboration

Presentation transcript:

Polarization Observables in Hyperon Photoproduction with CLAS Craig Paterson University of Glasgow Eurotag Workshop Glasgow, 1 st September 2008

Introduction Search for Missing Resonances Undetected baryon states predicted to couple strongly to KL and KS channels Strongly correlated diquarks? Understand strangeness production off the proton Sensitive test of resonance structure –PDG star rating for missing resonances

Polarization Observables 4 Complex amplitudes completely describe pseudoscalar meson photoproduction This gives 16 real polarization observables Possible Measurements Require 8 observables for a complete measurement

Fully Polarized Lambda Evidence from previous CLAS analysis for a fully polarized Lambda Hyperon Creation of virtual strange quark – antiquark pair in a 3 S 1 state Spin Couplings treated at the quark level Analogous results for linearly polarized photons?!?

KL Reaction In CLAS Use 4p CLAS detector to search for the reactions gp -> K + L -> K + pp - gp -> K + S -> K + Lg -> K + pp - g

Photon Polarization Photon polarization calculated to be > 90% Underestimate of polarization for certain energies Improved measurements required Compare to previous data? Polarimeter would be nice!!!

Analysis: Event Selection Sophisticated analysis algorithm to select L and S events Initial selection based on mass calculated from time-of-flight Identify the correct photon Fiducial cuts

Analysis: Event Selection Correctly Identify Hyperon Events Remove mis-identifed kaons/pions Reconstruct hyperons from Missing mas Pions Lambda Sigma

Analysis: Extraction of Photon Asymmetry Photon Asymmetry, S, extracted from cos(2f) fit to azimuthal kaon distribution Fits shown for 1 energy bin 340 (20E, 17q) kinematic bins Almost full angular coverage

Photon Asymmetry Results – KL Results compared with previous results from GRAAL 7, 50MeV Energy bins > 1475MeV Good agreement with previous results PRELIMINARY

Photon Asymmetry Results – KL Results compared with previous results from LEPS 6, 100MeV Energy bins > 2050MeV More bins for our data!!! Increase the angular coverage to backward angles PRELIMINARY

Photon Asymmetry Results – KS Results compared with previous results from GRAAL 7, 50MeV Energy bins > 1475MeV Good agreement with previous results PRELIMINARY

Photon Asymmetry Results – KS Results compared with previous results from LEPS 6, 100MeV Energy bins > 2050MeV More bins for our data!!! Increase the angular coverage to backward angles PRELIMINARY

Analysis: Extraction of O x /O z /P and T O x /O z extracted from fit to 2d asymmetry Recoil Polarization extracted from acceptance corrected proton distribution Target Asymmetry extracted from 2d Asymmetry Only results for KL channel will be shown!!!

Results: Recoil Polarization results for KL Results compared to previous CLAS and GRAAL results Results: g8b Prev CLAS GRAAL ~Factor of 4 increase in statistics from best previous measurements

Results: O x Results compared with Regge-Plus-Resonance model from Gent group - Large Polarizations! - Some evidence for an important role for missing D 13 (1900) state PRELIMINARY

Results: O x Results compared with Kaon-MAID calculations - Calculations involving both core and missing resonances - Failure at low energies - Some evidence for an important role for missing D 13 (1900) state PRELIMINARY

Results: O z Results compared with Regge-Plus-Resonance model from Gent group - Less polarization transfer along z-axis PRELIMINARY

Results: Target Asymmetry Results compared with Regge-Plus-Resonance model from Gent group - Large polarizations - Less discrimination between model calculations PRELIMINARY

Results: Fully Polarized Lambda Evidence for full lambda polarization with linearly polarized photons? - Full polarization at forward angles - Not repeated over full kinematic range - Compare with previous results??? - More relations can be tested PRELIMINARY

Summary High Statistics, High Quality Data Set for KL and KS photoproduction Large Improvement Over Previous Recoil and Photon Asymmetry Measurements Large Improvement Over Previous O x and O z, and Target Asymmetry Results Measurements Display Good Discriminating Power Between Different Model Calculations – Sensitive to Resonant Contributions Full Polarization Only Evident at Mid to Forward Angles Further Theoretical Input Required Better Calculation of Degree of Photon Polarization Required - Eurotag!!!