The Program at Jefferson Lab

Slides:



Advertisements
Similar presentations
Introduction. November 2002 Good News House Senate.
Advertisements

Jan. 19, 2005GlueX/Exotics 2005 GlueX: Search for Gluonic Excitations at JLab Dr. David Lawrence Jefferson Lab Dr. David Lawrence Jefferson Lab.
Introduction Glasgow’s NPE research Group uses high precision electromagnetic probes to study the subatomic structure of matter. Alongside this we are.
An initial study of mesons and baryons containing strange quarks with GlueX 12 GeV electrons 40% lin. Pol. Uncollimated Collimated Coherent Peak GlueX.
 photoproduction with linearly polarized photons at SPring-8 SENDAI03 16 th June, 2003 Tsutomu Mibe (Research Center for Nuclear Physics, Osaka univ.,
The Physics of GlueX Curtis A. Meyer Carnegie Mellon University.
Department of Physics and Astronomy
Hadron Physics with polarized photons at 9 GeV with GlueX Richard Jones University of Connecticut UConn Physics Graduate Studies Open House, Mar. 19, 2010.
Study of two pion channel from photoproduction on the deuteron Lewis Graham Proposal Phys 745 Class May 6, 2009.
The GlueX Experiment Curtis A. Meyer Carnegie Mellon University The GlueX Collaboration 8/23/10 1 GlueX Experiment 12 GeV electrons 40% lin. Pol. Uncollimated.
The GlueX Experiment in Hall-D
Experiment HUGS 2011 – Jefferson Laboratory Hussein Al Ghoul Department Of Physics Florida State University ᵠ.
20 October, 2004GlueX Detector Review 1 The GlueX Detector Curtis A. Meyer This talk Next talk.
GlueX/Hall-D Physics Curtis A. Meyer Carnegie Mellon University JLab Users Group Meeting, June 7,2010.
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 At Threshold Energies.
Spectroscopy: Experimental Status and Prospects Curtis A. Meyer Carnegie Mellon University.
Amplitude Analysis in GlueX Curtis A. Meyer Carnegie Mellon University.
Elton S. Smith MESON2012 May 31 – June 5, GlueX: Photoproduction of Hybrid Mesons Elton S. Smith, Jefferson Lab for the GlueX Collaboration 12th.
Meson spectroscopy with photo- and electro-production Curtis A. Meyer Carnegie Mellon University.
Seema Dhamija for the GLUEX collaboration Florida International University Seema Dhamija QNP09, IHEP, Beijing – 22/09/2009.
The GlueX Detector 5/29/091CIPANP The GlueX Detector -- David Lawrence (JLab) David Lawrence (JLab) Electron beam accelerator continuous-wave (1497MHz,
Crossed Channel Compton Scattering Michael Düren and George Serbanut, II. Phys. Institut, - some remarks on cross sections and background processes  
3/6/2008PHP March Photon-hadron physics with the GlueX detector at Jefferson Lab Curtis A. Meyer, Spokesperson GlueX CH L-2.
Hadron Spectroscopy from Lattice QCD
Graphic from poster by Sarah Lamb, UConn Honors Program event Frontiers in Undergraduate Research, April 2009 Collimator subtends
First Results of Curtis A. Meyer GlueX Spokesperson.
Hadron physics Hadron physics Challenges and Achievements Mikhail Bashkanov University of Edinburgh UK Nuclear Physics Summer School I.
C. Schwarz Experiments with a cooled p beam on an internal target Physics program Detector set-up p e - coolerdetector High Energy Storage Ring HESR P.
Molecular Charmonium. A new Spectroscopy? II Russian-Spanish Congress Particle and Nuclear Physics at all Scales and Cosmology F. Fernandez D.R. Entem,
Electronics play a critical role in modern accelerator physics experiments. Events will be recorded at a rate of 200,000/second. Modular electronics such.
N* Production in α-p and p-p Scattering (Study of the Breathing Mode of the Nucleon) Investigation of the Scalar Structure of baryons (related to strong.
Sub-Nucleon Physics Programme Current Status & Outlook for Hadron Physics D G Ireland.
F.-H. Heinsius (Universität Freiburg/CERN) Introduction Gluon polarization in the nucleon Transverse spin distribution Newest Results from the Experiment.
g/ JLab Users Group Meeting Curtis A. Meyer Poster.
Measuring the charged pion polarizability in the  →    −  reaction David Lawrence, JLab Rory Miskimen, UMass, Amherst Elton Smith, JLab.
Hybrid Mesons and Spectroscopy Curtis A. Meyer Carnegie Mellon University Based on C.A. Meyer and Y. Van Haarlem, Phys. Rev. C82, (2010). Overview.
Status of Beam Asymmetry Measurements for Meson Photoproduction ASU Meson Physics Group Hadron Spectroscopy WG Meeting – June 2009 Status of Beam Asymmetry.
Overview - Alex Dzierba Hall D Calorimeter Review 1 Hall D/GlueX Calorimeter Review Overview and Physics Motivation Alex R. Dzierba Indiana U and Jefferson.
The GlueX Detector in Hall-D at Jefferson Lab February 16, 2010 David Lawrence, Jefferson Lab (for Curtis A. Meyer, Carnegie Mellon University) July 7,
Marialaura Colantoni1 Workshop on Hadron Structure and Spectroscopy Marialaura Colantoni* on behalf of the COMPASS coll. *Universita’ del Piemonte.
1. Science of Confinement The spectroscopy of light mesons led to the quark model and QCD: mesons are quark-antiquark color singlet bound states held.
Daniel Sherwood 03/2005 Search for Crypto-Exotic States in Babar Daniel Sherwood Dr. Liliana Teodorescu.
July 10, 2006TAPS 2006 Experimental Hall-D and the GlueX Experiment at Jefferson Lab Dr. David Lawrence Jefferson Lab Dr. David Lawrence Jefferson Lab.
Mach 07, 2008PHP 2008, Newport News, VA Photoproduction in Nuclei Thursday, March 6 - Saturday, March 8, 2008 Z.-E. Meziani Temple University Photon-hadron.
Measurement of Photoproduction of  (1020) Mesons on Protons by Linearly Polarized Photons EMI2001, December 5th, 2001 T.Mibe for the LEPS collaboration.
Hall-D and the GlueX Experiment at Jefferson Lab Simon Taylor / JLAB Exotic Mesons The 12 GeV Upgrade Hall D GlueX Outlook.
Hall-D and the GlueX Experiment at Jefferson Lab Simon Taylor / JLAB Exotic Mesons The 12 GeV Upgrade Hall D GlueX Outlook.
Timelike Compton Scattering at JLab
Hadron Physics at Belle
Baryons on the Lattice Robert Edwards Jefferson Lab Hadron 09
Masses, Forces, Higgs and Gluons
Search for New and Unusual Strangeonia in Photoproduction using CLAS
Curtis A. Meyer Carnegie Mellon University
Recent results on light hadron spectroscopy at BES
Plans for nucleon structure studies at PANDA
Samples of Hall B Results with Strong Italian Impact
Photoproduction of vector mesons off nuclei with the GlueX detector
The 12 GeV Jlab Upgrade Project
Precision Measurement of η Radiative Decay Width via Primakoff Effect
Study of New Hadron Spectroscopy at BESIII
The GlueX Experiment Curtis A. Meyer CH L-2 11/28/2018 CIPANP 2006.
The Hadron Spectrum and QCD
Excited State Spectroscopy from Lattice QCD
The 12 GeV Upgrade of the CEBAF Accelerator at Jefferson Lab
Excited State Spectroscopy from Lattice QCD
New Results on 0 Production at HERMES
A Map to Hadronic physics from
What can we learn about X resonances at K1.8
Curtis A Meyer Carnegie Mellon University
Presentation transcript:

The Program at Jefferson Lab Spectrum of Mesons Quark model, lattice calculations The GlueX experiment Early physics Asymmetries, SDMEs, Charm at threshold Summary Elton S. Smith, Jefferson Lab APCTP Workshop on “The Nature of Hadron Mass and Quark-Gluon Confinement from JLab Experiments in the 12-GeV Era” Pohang, Korea, July 1-4, 2018

q q QCD Spectroscopy S2 S1 L Quark model is amazingly successful at describing the hadron spectrum. Yet most of the hadron mass is not due to quarks q q Search for glue using non-qq degrees of freedom S1 S2 L S = S1 + S2 J = L + S P = - (-1)L C = (-1)L+S JPC = 0– + 0++ 1– – 1+ – 2++ … Allowed combinations

q q QCD Spectroscopy S2 S1 L Quark model is amazingly successful at describing the hadron spectrum. Yet most of the hadron mass is not due to quarks q q Search for glue using non-qq degrees of freedom S1 S2 L S = S1 + S2 J = L + S P = - (-1)L C = (-1)L+S JPC = 0– + 0++ 1– – 1+ – 2++ … Allowed combinations JPC = 0– – 0+ – 1– + 2+ – … Not-allowed: exotic

Tetraquarks and Pentaquarks (Heavy Quarks) BESIII PRL 110 (2013) 252001 BELLE PRL 110 (2013) 252002

Tetraquarks and Pentaquarks (Heavy Quarks) BESIII PRL 110 (2013) 252001 BELLE PRL 110 (2013) 252002 LHCb PRL 115 (2015) 072001

COMPASS: Exotic p1, h1, h’1? Asymmetry in cosq is a result of interference between even and odd partial waves Exotic 1-+ larger in h’p- than hp- No resonance parameters are presented for the exotic L odd- waves COMPASS PLB 740 (2015) 303

LQCD Meson spectrum for light quarks Dudek PRD 83 (2011) 111502 Mp~400 MeV Dudek PRD 84 (2011) 074023

LQCD Meson spectrum for light quarks Dudek PRD 83 (2011) 111502 Mp~400 MeV Dudek PRD 84 (2011) 074023 0-+, 1--, 2-+, 1-+ Supermultiplet States with non-trivial gluonic fields

Models for hybrid mesons Guo PRD 78 (2011) 056003 Mass (MeV) 0−+ 1−− 2−+ 1−+ 0+− 2+− 0−+ 1−− 2−+ 1−+ 0+− 2+− Constituent Gluon JgPC=1+− Lattice QCD Compare to approach and spectrum in Xu et al., arXiv:1805.06430

Photoproduction g  ,, X Possible decay modes g e N Very little photoproduction data in this energy range Approximately the 70% of total cross section in the energy region Eg ~ 7-12 GeV has multiple neutrals and is completely unexplored Polarized photons may help disentangle different production mechanisms N g e X Possible decay modes g  ,,

Jefferson Lab site

Photon beam and experimental area

Linearly Polarized Photon Beam Measured Spectrum (over PS acceptance) Calculated Spectrum (12 GeV beam) 4 nominal tagging interval GlueX PRC95 (2017) 042201

Pb-glass detector (Fcal) Superconducting 2 T solenoid Hall D – GlueX detector Pb-glass detector (Fcal) Time- of-flight (tof) Hermetic detection of charged and neutral particles in solenoid magnet Barrel Calorimeter (Bcal) Target (LH2) Flux (peak) ~ 2x107 g/s 18,000 FADCs 4,000 pipeline TDCs 50 KHz L1 trigger 600 MB/s to tape Tagger Spectrometer (Upstream) Tracking Cathode strips Drift chambers Straw tubes Superconducting 2 T solenoid

Viewer single-event Tracks, calorimeter showers reconstructed Side view Top view

Program to study meson spectrum Collect Data Determine Observables Understand Production Mechanisms Determine Mass-independent Amplitudes Identify known mesons Search for exotics

Program to study meson spectrum Collect Data Determine Observables Understand Production Mechanisms Determine Mass-independent Amplitudes Identify known mesons Theoretical Models (e.g. JPAC….) Search for exotics Amplitude Analysis

Program to study meson spectrum Collect Data Current Efforts Asymmetries SDMEs Cross sections ……… Opportunistic Physics Determine Observables Understand Production Mechanisms Determine Mass-independent Amplitudes Identify known mesons Theoretical Models (e.g. JPAC….) Search for exotics Amplitude Analysis

p0 and h azimuthal asymmetry JPAC PRD 92 (2015) 074013 p0 h

p0 and h asymmetries GlueX PRC95 (2017) 042201 p0 and h azimuthal asymmetries measured for 0 < -t < 1.5 GeV2 Measurements are being compared to model calculations to understand particle exchange mechanisms First asymmetry measurements for h at this energy

Pseudo-scaler asymmetries Production is consistent with vector exchange dominance Expect similar mechanism for exotics

gp -> p- D++ Asymmetry See Yu, Session 2

Spin density matrix elements (SDMEs) See McGinley, JLab User’s Meeting 2018 SDMEs measure the transfer polarization from the photon to the vector meson V JPAC PRD 97 (2018) 094003 F is the angle between the photon polarization and the production plane Helicity Conservation: Standard Decomposition

gp -> fp Consistent with s-channel helicity conservation Production mechanism dominated by Pomeron exchange A. Barnes, Ph.D. UConn, 2017

gp -> w p Expect contributions from pseudo- scalar exchange Consistent with previous SLAC results Provides insight into the exchange mechanisms M. Staib, Ph.D. CMU, 2017

Opportunities in spectroscopy: 4g systems ? Previous photoproduction data with multiple neutrals is very limited Systems decaying with L=odd to hp have exotic JPC.

Opportunities in spectroscopy: 4g systems expanded scale ? Previous photoproduction data with multiple neutrals is very limited Systems decaying with L=odd to hp have exotic JPC.

Charm production near threshold See Pentchev, JLab User’s Meeting 2018 Brodsky et.al. PLB 498 (2001) 23 GlueX Energy Range

Preliminary J/y results Preliminary cross sections Eg~8-12 GeV

Preliminary J/y results Preliminary cross sections Eg~8-12 GeV

Preliminary J/y results Pc(4450) No indication of LHCB pentaquark Preliminary cross sections Eg~8-12 GeV

Summary We have mounted the GlueX experiment in Hall D at Jefferson Lab devoted to the study of hybrid mesons. Their existence and properties will yield fundamental information regarding the force that confines quarks. On the road toward finding exotic hybrids, we are Measuring beam-spin asymmetries for several particles to understand production mechanisms Measuring spin density matrices for vector mesons Working on amplitude analysis of some simple systems such as hp and h’p (exotic JPC for L=odd) Pursuing opportunistic physics such as J/y production at threshold Upcoming experiments: Primakoff h and rare h decays High Intensity GlueX (with DIRC) Charged Pion Polarizability Also see Somov, Session 4

Decay modes for exotics