# 9/5/08

## SIDIS Analysis

a.) Cross-Section comparison

i.) Calculate absolute cross section for = 0.5, 1 < Q^2 < 4 GeV^2 , W = 1.45 +/- 0.2 GeV

ii.) Plot -vs- when = -0.3 also plot -vs-

As one can see from histograms of the pion_theta_angle_vs_phi_angle_in_CM_Frame and the electron_theta_angle_vs_phi_angle_in_CM_Frame, the pion and electron acceptance in the region of is nearly zero(significantly low).

 electron sector pion_theta_angle_vs_phi_angle_in_CM_Frame_after_cuts(EC_inner>0.06, EC_tot/p>0.2, nphe>2.5, , ) electron_theta_angle_vs_phi_angle_in_CM_Frame_after_cuts(EC_inner>0.06, EC_tot/p>0.2, nphe>2.5, , ) 1 2 3 4 5 6

_vs_ plot shows that the cut should not make much difference on plot. The cut around should reduce the number of pions around 0 and 360 of phi angle.

# 9/19/08

## SIDIS Analysis

a.) Cross-Section comparison

i.) Calculate absolute cross section for = 0.5, 1 < Q^2 < 4 GeV^2 , W = 1.45 +/- 0.2 GeV

?


Documentation

The five-fold differential cross section for single pion production is equal to the following:

The Jacobian term can be given as:

where is the virtual photon flux and can be written as

The reason of having low cross section might be binning

In paper they use the following number of bins:

 Variable Num. Bin Range Bin Size W 27 1.15 - 1.7 GeV 20 MeV 7 1.1 - 5.0 variable 10 -1.0 - 1.0 0.2 24 -180. - 180 15

Number of bins in my case were 360.

Number of bins equal is ~24

When i applied cut, the number of entries were reduced to 152.

In paper they use liquid-hydrogen unpolarized target(we have NH3 and ND3 polarized). The polarized electron beam current is 8 nA(in our case it is about 6 nA). and luminosity is different too. It also depends on statistics.

ii.) What is smallest angular coverage of EC (8 degrees?) Determine phi region where there is no acceptance ( where should we stop plotting data)?

iii.) Asymmetry Calculation

a.) Beam Asymmetry Plot

In order to plot Beam Asymmetry we need to plot for the first time the histogram of the invariant_mass_vs_cross_section. Then determine the structure function fitting the cross section and calculating the beam asymmetry function which is given as :

for given cos(theta) of the pion in cm, Q^2 and W invariant mass.

Choose kinematics ( a single theta and phi point )to max our stats and comparison to paper Histogram the following

1. Number of e-pi coincidence events, number of FC counts
2. Number of e-pi coincidence events/FC counts
3. Number of e-pi coincidence events/FC count/Pt

for groups of runs with h_e,P_t = ++, +-, -+, --

table with 4 columns of h_e, P_t and 3 rows of the above histograms

# 9/26/08

## SIDIS Analysis

1.) make semi-inclusive spectrum:

a.) h>0 Pt>0 b.) h > 0 pt<0 c.)h<0 pt>0 d.)h<0 pt<0

2.) ad up opposite target polarization histograms

3.) subtract h> 0 and h<0

helflag = 1 =>

helflag = 2 =>

helflag = 3 =>

helflag = 4 =>

## Phi_angle_CM vs Asymmetry

Compared data(there is no table for asymmetry values like cross section):

# 11/21/08

0.) insert run summarry table, Pb, Pt, PB*Pt, Btorus

1.) make semi-inclusive spectrum:

a.) h>0 Pt>0

b.) h > 0 pt<0

c.)h<0 pt>0

d.)h<0 pt<0

2.) helicity difference plots for Pt>0 and Pt<0

3.) Asym plots for Pt>0 and Pt< 0

4.) unpolarized target asymmetry

Rebin asymmetry hisograms and combine the two into a total asymmetry histogram


## Run Summary Table

The table below should have run ranges with
according
to the elastic asymmetry measurements stored at
http://www.jlab.org/Hall-B/secure/eg1/EG2000/eg1b_analysis_progress.htm.


http://www.jlab.org/Hall-B/secure/eg1/EG2000/josh/pbpt/


5.73 in
pos = 0.45743 +/- 0.04269
neg = -0.38816 +/- 0.04556

5.73 out
pos = 0.46604 +/- 0.03496
neg = -0.50684 +/- 0.03578

 Start Run Number Beam Polarization(Pb) Target Polarization(Pt) from dstdump file Pb*Pt Beam Torus Beam Energy (MeV) 26998 0 -0.69 0.46604 -2250 5736 26996 -0.71 -0.69 0.46604 -2250 5736 26995 -0.71 -0.69 0.46604 -2250 5736 26994 -0.71 -0.73 0.46604 -2250 5736 26993 -0.71 -0.72 0.46604 -2250 5736 26992 -0.71 -0.73 0.46604 -2250 5736 26991 -0.71 -0.75 0.46604 -2250 5736 26990 -0.71 -0.76 0.46604 -2250 5736 26989 0.71 -0.67 -0.38816 2250 5736 26988 0.71 -0.68 -0.38816 2250 5736 26987 0.71 -0.67 -0.38816 2250 5736 26986 0.71 -0.68 -0.38816 2250 5736 26985 0.71 -0.68 -0.38816 2250 5736 26984 0.71 -0.68 -0.38816 2250 5736 26983 0.71 -0.68 -0.38816 2250 5736 26981 0.71 -0.68 -0.38816 2250 5736 26980 0.71 -0.7 -0.38816 2250 5736 26979 0.71 -0.71 -0.38816 2250 5736 26966 0.71 0.74 0.45743 2250 5736 26965 0.71 0.74 0.45743 2250 5736 26964 0.71 0.74 0.45743 2250 5736 26963 0.71 0.74 0.45743 2250 5736 26962 0.71 0.74 0.45743 2250 5736 26961 0.71 0.75 0.45743 2250 5736 26960 0.71 0.76 0.45743 2250 5736 26959 0.71 0.69 0.45743 2250 5736 26958 0.71 0.69 0.45743 2250 5736 26957 0.71 0.69 0.45743 2250 5736 26956 0.71 0.69 0.45743 2250 5736 26955 0.71 0.69 0.45743 2250 5736 26954 0.71 0.69 0.45743 2250 5736 26953 0.71 0.69 0.45743 2250 5736 26952 0.71 0.7 0.45743 2250 5736 26951 0.71 0.7 0.45743 2250 5736 26948 0.71 0.7 0.45743 2250 5736 26947 0.71 0.7 0.45743 2250 5736 26946 0.71 0.7 0.45743 2250 5736 26945 0.71 0.7 0.45743 2250 5736 26943 0.7 0.7 0.45743 2250 5736 26942 0.7 0.7 0.45743 2250 5736 26941 0.7 0.7 0.45743 2250 5736 26940 0.7 0.7 0.45743 2250 5736 26939 0.7 0.7 0.45743 2250 5736 26938 0.7 0.7 0.45743 2250 5736 26937 0.7 0.7 0.45743 2250 5736 26934 0.7 0.7 0.45743 2250 5736 26933 0.7 0.71 0.45743 2250 5736 26932 0.7 0.71 0.45743 2250 5736 26931 0.7 0.71 0.45743 2250 5736 26930 0.7 0.71 0.45743 2250 5736 26929 0.7 0.71 0.45743 2250 5736 26928 0.7 0.72 0.45743 2250 5736 26927 0.7 0.72 0.45743 2250 5736 26926 0.7 0.73 0.45743 2250 5736 26925 0.7 0.73 0.45743 2250 5736 27074 0.71 -0.81 -0.38816 2250 5736 27075 0.71 -0.77 -0.38816 2250 5736 27076 0.71 -0.74 -0.38816 2250 5736 27077 0.71 -0.74 -0.38816 2250 5736 27078 071 -0.75 -0.38816 2250 5736 27079 0.71 -0.72 -0.38816 2250 5736 27100 0.71 0.76 0.45743 2250 5736 27101 0.71 0.76 0.45743 2250 5736 27102 0.71 0.73 0.45743 2250 5736 27105 0.61 0.73 0.45743 2250 5736 27106 0.61 0.73 0.45743 2250 5736 27107 0.61 -0.71 -0.38816 2250 5736 27108 0.61 -0.7 -0.38816 2250 5736 27109 0.61 -0.7 -0.38816 2250 5736 27111 0.61 -0.71 -0.38816 2250 5736 27112 0.61 -0.69 -0.38816 2250 5736 27114 0.61 0 2250 5736 27116 -0.58 0.2 -0.38816 2250 5736 27124 -0.7 0.24 -0.38816 2250 5736 27125 -0.7 0.25 -0.38816 2250 5736 27126 -0.7 0.26 -0.38816 2250 5736 27127 -0.7 0.26 -0.38816 2250 5736 27128 -0.7 0.26 -0.38816 2250 5736 27129 -0.7 0.26 -0.38816 2250 5736 27131 -0.7 0.26 -0.38816 2250 5736 27132 -0.7 0.26 -0.38816 2250 5736 27133 -0.7 0.26 -0.38816 2250 5736 27134 -0.7 0.26 -0.38816 2250 5736 27135 -0.7 0.26 -0.38816 2250 5736 27136 -0.7 0.26 -0.38816 2250 5736 27137 -0.7 0.25 -0.38816 2250 5736 27138 -0.7 0.25 -0.38816 2250 5736 27139 -0.7 0.25 -0.38816 2250 5736 27141 -0.7 0.25 -0.38816 2250 5736 27142 -0.7 0.25 -0.38816 2250 5736 27143 -0.7 0.25 -0.38816 2250 5736 27145 -0.7 0.24 -0.38816 2250 5736 27146 -0.7 0.24 -0.38816 2250 5736 27148 -0.7 0.24 -0.38816 2250 5736 27149 -0.7 -0.09 0.45743 2250 5736 27150 -0.7 -0.12 0.45743 2250 5736 27152 -0.64 -0.18 0.45743 2250 5736 27153 -0.64 -0.19 0.45743 2250 5736 27154 -0.64 -0.19 0.45743 2250 5736 27155 -0.64 -0.19 0.45743 2250 5736 27156 -0.64 -0.19 0.45743 2250 5736 27157 -0.64 -0.19 0.45743 2250 5736 27160 -0.64 -0.18 0.45743 2250 5736 27161 -0.64 -0.18 0.45743 2250 5736 27162 -0.64 -0.19 0.45743 2250 5736 27163 -0.64 -0.19 0.45743 2250 5736 27165 -0.64 -0.19 0.45743 2250 5736 27166 -0.64 0.18 -0.38816 2250 5736 27167 -0.64 0.22 -0.38816 2250 5736 27168 -0.64 0.23 -0.38816 2250 5736 27169 -0.64 0.23 -0.38816 2250 5736 27170 -0.64 0.23 -0.38816 2250 5736 27171 -0.64 0.23 -0.38816 2250 5736 27172 -0.64 -0.35 0.45743 2250 5736 27175 -0.7 -0.78 0.45743 2250 5736 27176 -0.7 -0.72 0.45743 2250 5736 27177 -0.7 -0.7 0.45743 2250 5736 27178 -0.7 -0.69 0.45743 2250 5736 27179 -0.7 -0.67 0.45743 2250 5736 27180 -0.7 -0.67 0.45743 2250 5736 27181 -0.7 -0.66 0.45743 2250 5736 27182 -0.7 -0.72 0.45743 2250 5736 27183 -0.7 -0.68 0.45743 2250 5736 27184 -0.7 -0.63 0.45743 2250 5736 27186 -0.7 0.72 -0.38816 2250 5736 27187 -0.7 0.71 -0.38816 2250 5736 27188 -0.7 0.71 -0.38816 2250 5736 27189 -0.7 0.7 -0.38816 2250 5736 27190 -0.7 0.69 -0.38816 2250 5736 27191 -0.7 0.69 -0.38816 2250 5736 27192 -0.7 0.68 -0.38816 2250 5736 27193 -0.7 0.69 -0.38816 2250 5736 27194 -0.7 0.7 -0.38816 2250 5736 27195 -0.7 0.69 -0.38816 2250 5736 27113 0.61 0.68 0.45743 2250 5736

## Phi_Angle_CM_Frame for Positive and Negative Target Polarization

 Helcode # Negative Target Polarization Positive Target Polarization 1 h>0 2 h<0 3 4

## Helicity Difference Plots for Pt>0 and Pt<0

 Helicity Difference Negative Target Polarization Positive Target Polarization h1-h4 h3-h2