Some Attempts to The Separation of Coherent and Incoherent ψ Production
description
Transcript of Some Attempts to The Separation of Coherent and Incoherent ψ Production
![Page 1: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/1.jpg)
Some Attempts to The Separation of Coherent and Incoherent ψ Production
Po-Ju Lin
August 3,2004
![Page 2: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/2.jpg)
Contents Coherent – Incoherent
- definition
- t-dependence
ν- correlation The mysterious band t and t_LD2/t_LH2 distribution Summary
2q
![Page 3: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/3.jpg)
1. Coherent - Incoherent
Definition
1. Coherent ψ production : The incoming photons interact with nucleus as a whole.
2. Incoherent ψ production : Photons penetrate into nucleus and interact with nucleon i.e. proton.
![Page 4: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/4.jpg)
1. Coherent - Incoherent
Characteristic t-dependence
Due to the resolving ability of particles exchanged:
1. High-| t | region: Incoherent process dominates
2. Low-| t | region: Coherent process dominates
2 PPt
![Page 5: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/5.jpg)
1. Coherent - Incoherent
Our goal is to separate coherent and incoherent event from LD2 data
We use LH2 data as pure incoherent sample to make comparison
![Page 6: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/6.jpg)
Distribution Diagrams of LD2 and LH2 Data
![Page 7: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/7.jpg)
Incoherent vs. Coherent Plot of LD2 and LH2
![Page 8: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/8.jpg)
Comparison of LD2 and LH2 Distribution for coherent and incoherent events.
![Page 9: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/9.jpg)
2. Correlation between Energy Transfer and Three Momentum Transfer
From the conservation of four momentum, we acquire this correlation:
Where = energy transfer
= three momentum transfer
= nucleus mass = proton mass
PP
NN
mqm
mqm
22
22
q
Nm Pm
![Page 10: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/10.jpg)
ν vs. Distribution Plots for LD2 2q
![Page 11: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/11.jpg)
ν vs. Distribution Plots for LH2 2q
![Page 12: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/12.jpg)
Step Zoom In
step size:
= 0.2
= 0.1
2q
![Page 13: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/13.jpg)
3. The Mysterious band
The band above the incoherent interaction line in both LD2 and LH2 diagrams.
Property analysis
1. Colliding mass : direct fit from diagram using correlation formula.
2. Missing mass
![Page 14: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/14.jpg)
Colliding-Mass of The Mysterious Band
![Page 15: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/15.jpg)
Missing Mass of The Mysterious Band
Figure 1 - LD2 Figure 2 - LH2
![Page 16: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/16.jpg)
4. Momentum Transfer t for LD2 and LH2
![Page 17: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/17.jpg)
t_LD2/t_LH2 Ratio Plot
![Page 18: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/18.jpg)
Photon-energy vs. t for LD2 and LH2
![Page 19: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/19.jpg)
t_LD2/t/LH2 plots for Different Photon Energy Bin
Bin size : 0.2
E-gamma :1.5 ~ 2.5
![Page 20: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/20.jpg)
Overlapped t_LD2/t_LH2 of Different Photon Energy Bin
Figure 3 – original scale Figure 4 – Zoom in
![Page 21: Some Attempts to The Separation of Coherent and Incoherent ψ Production](https://reader036.fdocuments.net/reader036/viewer/2022081516/568144c8550346895db1911f/html5/thumbnails/21.jpg)
Summary
No really useful present method can efficiently separate coherent and incoherent events.