Project

General

Profile

Wiki » History » Version 29

Mireille Muhoza, 05/19/2019 12:01 PM

1 29 Mireille Muhoza
{{>toc right}}
2 1 Mireille Muhoza
3 28 Mireille Muhoza
h2. Experiment Overview
4
5 3 Mireille Muhoza
Pion occupies a special place in nature as one of the lightest hadrons, with one valence quark, and one valence antiquark. Small as it might be, the pion is also responsible for the long range character of the strong interaction that bind the atomic nucleus together. If chiral symmetry, which implies that Dirac Fermions are massless, were an exact global symmetry of strong interactions then pions would be massless. Through gluon-quark interaction and by explicit inclusion of light quark masses, chiral symmetry of massless QCD undergoes explicit symmetry breaking, thus giving pion its mass. This puts the pion at the core of the mechanism that dynamically generates all the mass of the hadrons and makes it a crucial element in understanding the hadron structure. Globally, this experiment will aim to confirm the potential of pion measurements both for studies of the pion structure itself and of the 3D structure of the proton, in terms of spatial imaging (tomography). In particular, E12-07-105 will probe if the measurements to map the spatial extension of the charged pion can be utilized to enable 3D spatial tomography of light quarks. 
6 2 Mireille Muhoza
7
8
TheE12-07-105 experiment is an exclusive measurement of the L/T separated pion electroproduction cross section aimed to probe conditions for factorization of deep exclusive measurements for charged pions in GPD studies and the pion form factor. It will make precision measurements of the L/T separated pion electroproduction cross sections to the highest achievable value of Q2 at the 12 GeV Jefferson Lab, ~10 GeV2. Before considering the extraction of GPDs from pion electroproduction data, we must confirm that charged pion longitudinal cross section is more dominant than the transverse cross section as expected from GPD models. We will test the longitudinal cross section dominance in charged pion production by making measurement of the Q2 dependence of the 
9 1 Mireille Muhoza
π+ longitudinal and transverse cross sections. A significant longitudinal response maybe indicative of the realization of the scaling expectation of the GPD formalism for charged pion electroproduction. The results may be useful in constraining the longitudinal backgrounds in the extraction if pion form factor from pion electroproduction data. We will measure forward π+ electroproduction by detecting the the pion produced in coincidence with the scattered electron using Hall C HMS and SHMS confuguration, and extract the cross sections using Rosenbluth technique. In additon, measurements in non-parallel kinematics will allow for simultaneous extraction of the interference terms and test of t- dependence of the π+ cross section. 
10 4 Mireille Muhoza
11 28 Mireille Muhoza
----
12 1 Mireille Muhoza
13 28 Mireille Muhoza
h2. E12-07-105 Documents
14
15 8 Mireille Muhoza
"Proposals":https://misportal.jlab.org/mis/physics/experiments/viewProposal.cfm?paperId=512
16 13 Mireille Muhoza
17 1 Mireille Muhoza
"Hall C Wiki":https://hallcweb.jlab.org/wiki/index.php/Main_Page
18 13 Mireille Muhoza
19
"Hall C Electronic Logbook":https://logbooks.jlab.org/book/hclog
20
21 10 Mireille Muhoza
"Hall C Information":https://www.jlab.org/physics/hall-c
22 1 Mireille Muhoza
23
"Experiment Schedule":https://www.jlab.org/physics/experiments/schedule
24
25 28 Mireille Muhoza
----
26 1 Mireille Muhoza
27 28 Mireille Muhoza
h2. Run Information
28 1 Mireille Muhoza
29 28 Mireille Muhoza
* [[Run Plans and Run Sheets]] 
30
* "Information for Shift Takers":https://hallcweb.jlab.org/wiki/index.php/Information_for_Shift_Takers
31
* "Documentation for Running Hall C":https://www.jlab.org/Hall-C/document/manuals.html
32
* "Analysis on Cdaq":https://hallcweb.jlab.org/wiki/index.php/Analysis_How-to
33
* "Contact Experts":https://hallcweb.jlab.org/wiki/index.php/Experts_on_call
34 1 Mireille Muhoza
35 28 Mireille Muhoza
----
36 1 Mireille Muhoza
37 28 Mireille Muhoza
h2. Data Analysis
38 1 Mireille Muhoza
39
"SIMC":https://hallcweb.jlab.org/wiki/index.php/SIMC_Monte_Carlo
40
"Hall C Analyzer":https://hallcweb.jlab.org/wiki/index.php/ROOT_Analyzer
41
42 28 Mireille Muhoza
----
43 1 Mireille Muhoza
44 28 Mireille Muhoza
h2. Meetings
45
46
* [[Hall C Commissioning Analysis Meetings]]
47
* "Detector Working Group Meetings":https://hallcweb.jlab.org/wiki/index.php/Detector_Working_Group_Meetings#Detector_Working_Group_Meetings_in_2017
48
* [[Pion LT Meetings]]
49
* [[BlueJeans Information]]  
50
51
----
52
53
h2. Collaboration
54
55
56
* [[Spokespersons]]
57
* [[Collaboration List]]
58
* [[Mailing List]]