Analysis of, decays from CLAS. Moskov Amaryan

Transcription

1 Analysis of, decays from CLAS Moskov Amaryan December 10, 2012

2 Outline -Introduction -Hadronic Decays of and -Summary

3 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 -

4 +p = pπ + π - X 12 M x 2 (p) [GeV 2] M x2 (pπ + π - ) [GeV 2] 1

5 CLAS Hadronic decays: g11 Data

6 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

7 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 X Y

8 Quark mass ratio GColangelo et al, arxiv: Q ±

9 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 ± ±

10 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 A LR PDG average A Q PDG average 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: [WASA-COSY] CLAS expected stat error 0001

11 Also CLAS ω π + π π 0 Not corrected for acceptance About 17M s Y X Theory paper arxiv: SSchneider et al (December 4, 2012) Dispersive analysis: Sensitive to pion-pion P-wave scattering phase shift Largest statistics in the world

12 Hadronic decay η è ππη G-Parity violation è ππη "' # Mean:0958 GeV!:0005 GeV Range: ± 30! Yield: Background: S = 32 B f 1 (1285) - &p%$ + $ " M X (p) [GeV] $0"!?@A:!,'B'(! C&D9:E@9; #>!!! 589:;<9!"1*! =!8!;:;;>!"1*!! M X (p) [GeV] CLAS g11 Data (7 times more than in BESIII) another 3 times more on tape (from CLASg12 run)

13 Dalitz plot η è ππη

14 Dalitz plot projections η è ππη CLAS Preliminary uncorrected X EPJ A26,383, Y arxiv: C&1$*D==*&?(**1(@'* #EE,(D*D=8**F,@@*&-E?A-**

15 Testing Scalar Mesons in π+π- from arxiv: Based on Fariborz and Schechter model PRD 67,054001,2003 events/(13 MeV) KLOE-2 (DA NE) Projection 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

16 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)

17 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 Petersburg Nuclear Physics Institute, Gatchina, St Petersburg , Russia 3 INFN, Sezione di Genova, Genova, Italy 4 The George Washington University, Washington, DC Florida State University, Tallahassee, Florida University of South Carolina, Columbia, South Carolina Arizona State University, Tempe, Arizona Florida International University, Miami, Florida Thomas Jefferson National Accelerator Facility, Newport News, Virginia University of Glasgow, Glasgow G12 8QQ, United Kingdom 11 Catholic University of America, Washington, DC Institut für Experimentalphysik I, Ruhr Universität Bochum, Bochum, Germany 13 Helmholtz-Institut für Strahlen- und Kernphysk (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, D Bonn, Germany 14 Rensselaer Polytechnic Institute, Troy, New York Skobeltsyn Nuclear Physics Institute, 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 Bochum, Germany 18 Institut für Kernphysik, Forschungszentrum, Jüelich, Germany 19 Jülich Center for Hadron Physics, Forschungszentrum Jülich, Jüich, Germany 20 Norfolk State University, Norfolk, VA 23504, USA 21 Institute for Advanced Simulation, Forschungszentrum Jülich, Jülich, Germany (Dated: September 30, 2012)