Update of analysis leps collaboration meeting in taiwan
This presentation is the property of its rightful owner.
Sponsored Links
1 / 36

Update of  Analysis ~LEPS Collaboration Meeting in Taiwan PowerPoint PPT Presentation


  • 72 Views
  • Uploaded on
  • Presentation posted in: General

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 E γ smearing Determination of Appropriate mass offshell effect

Download Presentation

Update of  Analysis ~LEPS Collaboration Meeting in Taiwan

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Update of analysis leps collaboration meeting in taiwan

Update of Analysis~LEPS Collaboration Meeting in Taiwan

Nuclear Physics Group, Academia Sinica

Bo-Ru, Lin

2006/01/12


Outline

Outline

  • Φphotoproduction using LD2 target

  • Validity of momentum calculation

  • Determination of Eγ smearing

  • Determination of Appropriate mass offshell effect

  • t-resolution

  • dN/dt fitting

  • Background estimation


Photoproduction using ld2 target

p, n, or D ?

Φ-photoproduction using LD2 target.

  • 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

Pseudo-scalar Exchange

Isospin effect in Coherent production

: isoscalar

η:isoscalar

Allowed

Forbidden

π: isovector

D : isoscalar

Conjecture:

By isospin conservation we should be able to separate πfrom the wholeexchanging channels.


Mmd of ld2 and lh2

MMd of LD2, and LH2

Missing mass distributions provide us a tool.

LD2

LH2


Validity of momentum calculation

Validity of momentum Calculation

Accredited Md = 1.875 GeV

Accredited MΛ = 1.520 GeV


Validity of momentum calculation1

Validity of momentum Calculation

Accredited Mp = 0.938 GeV


Validity of momentum calculation2

Validity of momentum Calculation

Accredited MΦ = 0.938 GeV


Determination of appropriate mc e smearing

Determination of appropriate MC Eγ smearing

MMp fitting of LH2 real data using different Eγ smearing

15 Mev Smearing


Determination of appropriate e smearing

Determination of appropriate Eγ smearing

Two component (11.64 MeV) Smearing

10 Mev Smearing


Determination of appropriate mass offshell effect

Determination of Appropriate mass offshell effect

Do subtraction and fit with gaussian distribution. Compare the result with coherent distribution

Use MC Incoherent MMd fit LD2 MMd (in the region 1.9~2.1)


Determination of appropriate mass offshell effect1

Determination of Appropriate mass offshell effect


Determination of appropriate mass offshell effect2

Determination of Appropriate mass offshell effect


Determination of appropriate mass offshell effect3

Determination of Appropriate mass offshell effect


T resolution sigma plot

t - resolution ~ sigma plot

t-in : from event generator

t-out : deduced in the way the same as real data

Fit (t-in) – (t-out) with gaussian distribution to get σ value

The t-resolution is better than 0.02 GeV


Mmd fitting to separate coherent from incoherent events

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

Cross check of MMd, and MMp Fitting


Coherent ld2 dn dt fitting

Coherent LD2 dN/dt Fitting

Fitting Formula:

intercept

slope


Coherent ld2 dn dt fitting1

t bin : 20 MeV

t bin : 30 MeV

t bin : 40 MeV

Coherent LD2 dN/dt Fitting


Coherent ld2 common slope dn dt fitting

t bin : 20 MeV

t bin : 30 MeV

t bin : 40 MeV

Coherent LD2 Common slope dN/dt Fitting

Slope : 20~23

Slope with last Eγbin removed : 17 ~19


Incoherent ld2 dn dt fitting

Incoherent LD2 dN/dt Fitting


Incoherent ld2 common slope dn dt fitting

Incoherent LD2 Common slope dN/dt Fitting


Dn dt fitting of coherent incoherent lh2 results

Incoherent

LH2

Coherent

dN/dt Fitting of coherent, incoherent, LH2 results

Coherent Slope : ~18.5

Incoherent Slope : ~4.0

LH2 Slope : ~3.6


Background estimation

Background Estimation

10 Mev cut


Mc backgrounds

MC Backgrounds

Invm-kk

MMd

MMp

None-resonant KKn

Λ(1520)

None-resonant KKd


Multidimensional fitting

Multidimensional Fitting

LD2 Data

Coherent

Invm-KK

MMd

MMp

Incoherent

Sum of all

Fit invm-KK, MMd, MMp simultaneously without background.


Multidimensional fitting1

LD2 Data

Coherent

Incoherent

Sum of BG

Sum of all

Sum of BG

KKn

Λ(1520)

Multidimensional Fitting

Invm-KK

MMd

MMp

KKd


Multidimensional fitting2

LD2 Data

Coherent

Incoherent

Sum of BG

Sum of all

Multidimensional Fitting

Invm-KK

MMd

MMp

Next step : Apply the same procedure with t-binning


Brief summary

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


Update of analysis leps collaboration meeting in taiwan

Backup Slides


Update of analysis leps collaboration meeting in taiwan

MMd

MMd, using smaller binning


Determination of appropriate mass offshell effect results of other ntuples

Determination of Appropriate mass offshell effect ~ Results of other Ntuples


Determination of appropriate mass offshell effect results of other ntuples1

Determination of Appropriate mass offshell effect ~ Results of other Ntuples


Determination of appropriate mass offshell effect results of other ntuples2

Determination of Appropriate mass offshell effect ~ Results of other Ntuples


Determination of appropriate mass offshell effect results of other ntuples3

Determination of Appropriate mass offshell effect ~ Results of other Ntuples


Determination of appropriate mass offshell effect results of other ntuples4

Determination of Appropriate mass offshell effect ~ Results of other Ntuples


  • Login