Update of  Analysis ~LEPS Collaboration Meeting in Taiwan Nuclear Physics Group, Academia Sinica Bo-Ru, Lin 2006/01/12.

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Presentation transcript:

Update of  Analysis ~LEPS Collaboration Meeting in Taiwan Nuclear Physics Group, Academia Sinica Bo-Ru, Lin 2006/01/12

Outline Φ photoproduction using LD2 target Validity of momentum calculation Determination of Eγ smearing Determination of Appropriate mass offshell effect t-resolution dN/dt fitting Background estimation

Φ -photoproduction using LD2 target. p, n, or D ? Incoherent Interaction ： Photon interact with constituent nucleon, which is proton or neutron. Coherent Interaction ： Photon interact with deuteron as a whole.

Isospin effect in Coherent production η: isoscalar π: isovector D : isoscalar  : isoscalar Allowed Forbidden By isospin conservation we should be able to separate π from the whole exchanging channels. Conjecture ： Pseudo-scalar Exchange

MMd of LD2, and LH2 Missing mass distributions provide us a tool. LD2LH2

Validity of momentum Calculation Accredited Md = GeVAccredited MΛ = GeV

Validity of momentum Calculation Accredited Mp = GeV

Validity of momentum Calculation Accredited MΦ = GeV

Determination of appropriate MC Eγ smearing 15 Mev Smearing MMp fitting of LH2 real data using different Eγ smearing

Determination of appropriate Eγ smearing 10 Mev Smearing Two component (11.64 MeV) Smearing

Determination of Appropriate mass offshell effect Use MC Incoherent MMd fit LD2 MMd (in the region 1.9~2.1) Do subtraction and fit with gaussian distribution. Compare the result with coherent distribution

Determination of Appropriate mass offshell effect

t - resolution ~ sigma plot The t-resolution is better than 0.02 GeV Fit (t-in) – (t-out) with gaussian distribution to get σ value t-in : from event generator t-out : deduced in the way the same as real data

MMd Fitting to Separate Coherent from Incoherent events Fitting of MMd of LD2 real data using Mote-Carlo generated incoherent, coherent events. coherent incoherent sum

Cross check of MMd, and MMp Fitting MMd MMp

Coherent LD2 dN/dt Fitting Fitting Formula ： intercept slope

Coherent LD2 dN/dt Fitting t bin : 30 MeV t bin : 20 MeV t bin : 40 MeV

Coherent LD2 Common slope dN/dt Fitting t bin : 30 MeV t bin : 20 MeV t bin : 40 MeV Slope : 20~23 Slope with last Eγbin removed : 17 ~19

Incoherent LD2 dN/dt Fitting

Incoherent LD2 Common slope dN/dt Fitting

dN/dt Fitting of coherent, incoherent, LH2 results LH2 Incoherent Coherent Coherent Slope : ~18.5 Incoherent Slope : ~4.0 LH2 Slope : ~3.6

Background Estimation 10 Mev cut

MC Backgrounds None-resonant KKn Λ(1520) None-resonant KKd Invm-kkMMpMMd

Multidimensional Fitting Invm-KKMMdMMp LD2 Data Incoherent Coherent Sum of all Fit invm-KK, MMd, MMp simultaneously without background.

Multidimensional Fitting Invm-KKMMdMMp LD2 Data Incoherent Coherent Sum of BG Sum of all KKd Sum of BG Λ(1520) KKn

Multidimensional Fitting Invm-KKMMdMMp LD2 Data Incoherent Coherent Sum of BG Sum of all Next step : Apply the same procedure with t-binning

Brief Summary Stable results of preliminary dN/dt analysis are acquired. Background estimation in every t, Eγ bin to acquire pure Φ events. Thank you for paying attention

Backup Slides

MMd MMd, using smaller binning

Determination of Appropriate mass offshell effect ~ Results of other Ntuples