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φ and ω resonance decay modes

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1 φ and ω resonance decay modes
Georgy Sharkov ITEP

2 ,ω resonances ω(782)  π+ π- π0 B.R. 0.89 (c = 23 fm)
If resonance decays before kinetic freeze-out  Possible rescattering of hadronic daughters  Reconstruction probability decrease for hadronic mode ω(782)  π+ π- π0 B.R (c = 23 fm) ω(782)  π+ π- B.R ω(782)  π0 B.R ω(782)  e+e- B.R φ(1020)  K+ K- B.R (c = 44 fm) φ(1020)  η B.R φ(1020)  e+e- B.R

3 t hadrons with &without QGP quarks&gluons

4 Model η η φ  l li l0 hadronization Kinetic freeze-out
l0~cτβ/√(1-β2) ~ ~(β=1/3 for this estimate)~ ~15fm(for φ) & 8fm(for ω) li l0 η η φ li~2fm for any hadron & 1fm for any pair of hadrons l hadronization Kinetic freeze-out G. Sharkov ITEP FRRC

5 Model Upper line – lepton mode l -decay products trajectory length
Splitting – two hadron and hadron-photon modes l -decay products trajectory length within matter φ β= 1/3 ω l,fm G. Sharkov ITEP FRRC

6 Is it really possible measurement?
Existing data from PHENIX& STAR B φ/w  e+e- φ  K+K- w  p+p-p0, p0g φ  ηg ? G. Sharkov ITEP FRRC

7 Φ(1020)  K+ K B.R c = 44 fm Φ(1020)  e+e- B.R c = 44 fm d+Au PHENIX Φ K+ K- STAR Preliminary √sNN = 200 GeV Au+Au PHENIX Φ e+e- √sNN = 200 GeV

8 ω(782)  π+ π- π0 B.R c = 23 fm ω(782)  π0 B.R c = 23 fm η(547)  π+ π- π0 B.R c = fm PHENIX η,ω π+ π- π0 p+p Au+Au p+p ω π0 PHENIX √sNN = 200 GeV ω π0 PHENIX G. Sharkov ITEP FRRC

9 Hiroshima University, Japan for the PHENIX collaboration
Y. Nakamiya Hiroshima University, Japan for the PHENIX collaboration QM 2008, India Branching ratio between e+e- and K+K- may be sensitive to mass modification, since Mphi is approximately 2  MK. -> Compare yields of fe+e- and f K+K- G. Sharkov ITEP FRRC

10 Φ Production  K+K- and e+e-
The leptonic channel yield is a little higher than hadronic channel More accurate measurement is required to confirm whether there is branch ratio modification G. Sharkov ITEP FRRC

11 To Do To make calculations for the effect of interest within realistic model To create algorithm for photonic modes identification in AA interactions To check this algorithm for CBM conditions with realistic simulations G. Sharkov ITEP FRRC

12 Model requirements realistic representation of particles (γ!)
evolution in time distinguish particles produced in dense and rare phases EPOS Energy conserving quantum mechanical multiple scattering approach,based on Partons (parton ladders) Off-shell remnants, and Splitting of parton ladders. G. Sharkov ITEP FRRC

13 + Statistical Hadronization Models and blast-wave fits
(elastic scattering) + Statistical Hadronization Models P. Braun-Munzinger, I. Heppe, J. Stachel, Phys. Lett B465 (1999) 15; F. Becattini, J. Manninen , M. Gazdzicki, Phys.Rev. C73 (2006) , hep-ph/ ; J. Cleymans, H. Oeschler, K. Redlich, S. Wheaton, Phys.Rev. C73 (2006) , hep-ph/ ; J. Rafelski, M. Danos, Phys. Lett. 97B (1980) 279; J. Rafelski, J. Letessier, J. Phys. G: Nucl. Part. Phys. 28 (2002) 1819 and blast-wave fits E. Schnedermann, J. Sollfrank, U. Heinz, Phys. Rev. C48 (1993) 2462 [8] F. Retiere, J.Phys. G30 (2004) S827-S834, nucl-ex/ ; J. Adams, STAR Collaboration, Phys. Rev. Lett. 92 (2004) ; I. Kraus, NA49 Collaboration, J.Phys. G31 (2005) S147-S154 G. Sharkov ITEP FRRC

14 Klaus WERNER, Phys. Rev. Lett. 98, 152301 (2007), arXiv:0704.1270.
EPOS √s=200GeV dAu K. Werner Nucl. Phys. B175 (2008) 81 200GeV (RHIC) GeV (SPS) Klaus WERNER, Phys. Rev. Lett. 98, (2007), arXiv: G. Sharkov ITEP FRRC

15 EPOS & UrQMD π+ G. Sharkov ITEP FRRC

16 Generate EPOS statistics Check all decay modes
Tune EPOS output for CBMROOT Produce CBMROOT events with full ECAL G. Sharkov ITEP FRRC

17 Extra slides G. Sharkov ITEP FRRC

18 Direct photons analysis
Re: [URQMD] ftn15 (fwd) ω η' K* "hm, yes photons are mesons in urqmd. however, photons should not be calculated within the urqmd, but explicitely outside with a different code. everybody should ignore all processes with photons involved. we will move them out of the model in the next version. cheers, Marcus Bleicher" f1(1285) Only from decay 2 γγ elastic scatterings(?!) UrQMD code 2006 UrQMD generator & cumulativeprocesses CBM simulation meeting

19 Formulas G. Sharkov ITEP FRRC Stavinskiy,ITEP,

20 Electron, hadron and photon in PHENIX
f/w  e+e- Momentum Electron ID f,w e+ e- PHENIX acceptance -0.35 < η < 0.35 2 x 90°in azimuthal angle for two arms Event selection BBC Electron ID RICH EMCal photon ID EMCal Hadron ID TOF EMCal-TOF w  p+p-p0, p0g f  K+K- p+ w g g Energy Momentum Hadron ID p- p0 f Momentum Hadron ID K+ K- G. Sharkov ITEP FRRC

21 d+Au d+Au p+p p+p Consistency between f  K+K- and f e+e-
Extended f  K+K- analysis d+Au 0-20% f p+p 　　No ID 　　Single ID 　　Double ID 　　e+e- M.B. f f candidates Double ID analysis no ID analysis Single ID analysis K+ K+ or K- K- h+ h- h+ or h- d+Au 0-20% 　　No ID 　　Single ID 　　Double ID M.B. p+p In p+p, spectra of e+e- and K+K- show reasonable agreement! fK+K- measurements have been extended to both higher and lower pT using new methods, i.e. no kaon ID and single kaon ID methods. The three independent kaon analyses are consistent with each other. G. Sharkov ITEP FRRC

22 Au+Au Spectra comparison between fe+e- and f K+K-
f e+e- AuAu MB f e+e % x 10-3 f e+e % x 10-1 f K+K- AuAu MB (no PID) f K+K- AuAu MB (double PID) f K+K- AuAu MB (PRC ) f K+K % x 10-3 (double PID) f K+K % x 10-1 (double PID) f K+K % x 10-1 (PRC ) M.B. 40-92% 20-40% Errors are too large to make any clear statement about the comparison of spectra for f  e+e- and f  K+K-. G. Sharkov ITEP FRRC

23 Yield comparison between fe+e- and f K+K-
Question 1’: Have we observed changes of yield between e+e- and K+K- ? Comparison of integrated yield is not enough, because mass modification effects depend on the pT region. Low pT mesons tend to decay inside the hot/dense matter f f Low pT High pT In addition, To determine the integrated yield, an extrapolation to lower pT is needed. There is a large uncertainty in the calculation. Thus, pT-dependent information is essential for comparison. Now, we should ask Have we observed changes of spectra between e+e- and K+K- ? G. Sharkov ITEP FRRC

24 What is the difference? Modes absorbtion vs Mass modification
Standard mesons vs modified mesons φ→KK & φ→η Modes absorbtion vs K/K* ratio Lepton modes vs thermal model Hadron stage vs equilibrium stage Modes absorbtion vs both other approaches Internal cross-check - 3 modes G. Sharkov ITEP FRRC Stavinskiy,ITEP,

25 Real σMN in matter can differ from that in free space
ω photoproducton on nuclear targets (ELSA) M.Kotulla et al., ArXiv: nucl-ex/ σωN ≈ 70 mb (in nuclear medium, 0.5 < P <1.6 GeV/c) σωN ≈ 25 mb (in free space - the model calculations)  photoproducton on nuclear targets T.Ishikawa et al., Phys.Lett.B608,215,(2005) σφN= 35 ± 14 mb (in nuclear medium) σφN ≈ 10 mb (in free space) “φ-puzzle” photoproducton on nuclear targets G. Sharkov ITEP FRRC

26 d+Au p+p Measurements of w in wide pT range w
pT spectra of w are measured for several decay modes in d+Au and p+p. wp0g dAu MB (PRC ) wp0p+p- dAu MB(PRC ) w e+e- pp MB (PHENIX preliminary) wp0g pp MB (PRC ) wp0p+p- pp MB(PRC ) wp0g pp ERT (PHENIX preliminary) wp0p+p- pp ERT (PHENIX preliminary) w d+Au p+p Spectra show good agreement among several decay channels. G. Sharkov ITEP FRRC

27 Branching ratios as an instrument for density integral measurements
 mesons ( mesons) new source of information Interplay between different ALICE subdetectors(?) Stavinskiy,ITEP,

28

29 Why  ?(common part) Themeson was proposed in the middle of 80’(Koch,Muller,Rafelski PR142,ShorPRL54) as one of the most promising QGP messengers because of the following reasons: an enhancement of –meson, as well as other strange hadrons in QGP phase interaction cross section is small and will keep information about the early hot and dense phase meson spectrum is not distorted by feeddown from resonance decays strangeness local conservation for   Stavinskiy,ITEP,

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