Analysis of, decays from CLAS Moskov Amaryan December 10, 2012
Outline -Introduction -Hadronic Decays of and -Summary
π 0 Light Mesons in CLAS e + e - e + e - π + π - π + π - π 0 e + e - π + π - π + π - π 0 π + π - π + π - e + e - π 0 π + π - π + π - π 0 ϕ π + π - π 0 π + π -
+p = pπ + π - X 12 M x 2 (p) [GeV 2] 1 08 06 04 3 10 10 2 10 02-002 -001 0 001 002 003 M x2 (pπ + π - ) [GeV 2] 1
CLAS Hadronic decays: g11 Data
CLAS VI η π + π π 0 I V II IV III X = 3 Q (T π + T π ), Y = 3T π 0 Q 1 ~2M events
Dalitz plot projections η π + π π 0 M 2 = A(1 + ay + by 2 + cx + dx 2 ) A 1 Q 2 = m2 d m2 u m 2 s ˆm 2 ; ˆm = m u + m d 2 g11 Data 12000 10000 10000 8000 8000 6000 6000 4000 4000 2000 2000 0-1 -05 0 05 1 X 0-1 -05 0 05 1 Y
Quark mass ratio GColangelo et al, arxiv:09100765 Q ±
γ µ µ µ µ < < < From Particle Data < Group: γγ ρ η π π π π π π π π π π π π γ π γ π π π π π ± ± β α ± ± ± φ ± ±
Test of C-Parity Violation Left-Right Asymmetry This work PRELIMINARY LAYTER 1972 JANE 1974 KLOE 2008 Quadrant Asymmetry This work PRELIMINARY LAYTER 1972 JANE 1974 KLOE 2008 Sextant Asymmetry This work PRELIMINARY GORMLEY 1968 LAYTER 1972 JANE 1974 KLOE 2008 PDG average -0002 0 0002 0004 0006 0008 A LR PDG average -0006-0004 -0002 0 0002 0004 A Q PDG average -0005 0 0005 001 A S Fig 1 Comparison of obtained values of asymmetries [7] with results determined by previous experiments [3,4,5], and a value given by PDG [6] arxiv:12101758 [WASA-COSY] CLAS expected stat error 0001
Also CLAS ω π + π π 0 Not corrected for acceptance 1 05 4000 About 17M s 3500 3000 Y 0-05 -1-1 -05 0 05 1 X 2500 2000 1500 1000 500 0 Theory paper arxiv: 12120654 SSchneider et al (December 4, 2012) Dispersive analysis: Sensitive to pion-pion P-wave scattering phase shift Largest statistics in the world
Hadronic decay η è ππη G-Parity violation è ππη 50000 40000 30000 20000 10000 "' # Mean:0958 GeV!:0005 GeV Range: ± 30! Yield: 287145 Background: 90218 S = 32 B f 1 (1285) - &p%$ + $ " 0 08 1 12 14 16 18 M X (p) [GeV] 18000 16000 14000 12000 10000 8000 $0"!?@A:!,'B'(! C&D9:E@9; #>!!! 589:;<9!"1*! =!8!;:;;>!"1*!! 1 101 102 103 104 105 M X (p) [GeV] CLAS g11 Data (7 times more than in BESIII) another 3 times more on tape (from CLASg12 run)
Dalitz plot η è ππη
Dalitz plot projections η è ππη CLAS Preliminary uncorrected 2500 2000 1500 1000 500 0-15 -1-05 0 05 1 15 X EPJ A26,383,2005 2200 2000 1800 1600 1400 1200 1000 800 600 400 200 0-15 -1-05 0 05 1 15 Y arxiv:10121117 C&1$*D==*&?(**1(@'* #EE,(D*D=8**F,@@*&-E?A-**
Testing Scalar Mesons in π+π- from arxiv:10033868 Based on Fariborz and Schechter model PRD 67,054001,2003 events/(13 MeV) 1000 800 600 400 200 KLOE-2 (DA NE) Projection 0 028 03 032 034 036 038 04 m(! +! - ) (GeV) Fig 18: The m π + π distribution in the η ηπ + π decay with the σ meson (right centered distribution) and without (left centered distribution) contribution 0 0 statistics we exp K 0 K0 γ) < 1 10 second phase of t resolution which and together wit lead to first obse 5Physicsint In this section we running outside t mal energy of s cm 2 s 1 alread With such a ma minosity of O(10 years of data taki what collected at allow major imp plications for the g 2ofthemuon at the M Z scale, VEPP-2000 at No
Summary Hadronic decays of and mesons attracted considerable attention both from theory and experiment Existing CLAS Data provide world highest statistics Significant efforts are planned to analyze these and other channels summarized in a recent CAA (CLAS Approved Analysis)
Photoproduction and Decay of Light Mesons in CLAS CLAS Analysis Proposal MJ Amaryan (spokesperson), 1, Ya Azimov, 2 M Battaglieri, 3 WJ Briscoe, 4 V Crede, 5 R De Vita, 3 C Djalali, 6 M Dugger, 7 G Gavalian, 1 L Guo, 8, 9 H Haberzettl, 4 CE Hyde, 1 DG Ireland, 10 F Klein, 11 B Kopf, 12 B Kubis, 13 A Kubarovsky, 14, 15 V Kubarovsky, 9 MC Kunkel, 1 B McKinnon, 10 K Nakayama, 16 C Nepali (spokesperson), 1 E Pasyuk, 9 MV Polyakov, 17, 2 BG Ritchie, 7 J Ritman, 18, 19, 12 C Salgado, 20 18, 19 S Schadmand (spokesperson), SP Schneider, 13 I Strakovsky, 4 D Weygand, 9 U Wiedner, 12 18, 19, 21 and A Wirzba 1 Old Dominion University, Norfolk, Virginia 23529 2 Petersburg Nuclear Physics Institute, Gatchina, St Petersburg 188300, Russia 3 INFN, Sezione di Genova, 16146 Genova, Italy 4 The George Washington University, Washington, DC 20052 5 Florida State University, Tallahassee, Florida 32306 6 University of South Carolina, Columbia, South Carolina 29208 7 Arizona State University, Tempe, Arizona 85287-1504 8 Florida International University, Miami, Florida 33199 9 Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 10 University of Glasgow, Glasgow G12 8QQ, United Kingdom 11 Catholic University of America, Washington, DC 20064 12 Institut für Experimentalphysik I, Ruhr Universität Bochum, 44780 Bochum, Germany 13 Helmholtz-Institut für Strahlen- und Kernphysk (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany 14 Rensselaer Polytechnic Institute, Troy, New York 12180-3590 15 Skobeltsyn Nuclear Physics Institute, 119899 Moscow, Russia 16 Department of Physics and Astronomy, University of Georgia, Athens, GA 30602, USA 17 Institut für Theoretische Physik II, Ruhr Universität Bochum, D 44780 Bochum, Germany 18 Institut für Kernphysik, Forschungszentrum, Jüelich, Germany 19 Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425 Jüich, Germany 20 Norfolk State University, Norfolk, VA 23504, USA 21 Institute for Advanced Simulation, Forschungszentrum Jülich, 52425 Jülich, Germany (Dated: September 30, 2012)