Project

General

Profile

Wiki » History » Version 46

Garth Huber, 06/10/2019 03:43 PM

1 28 Mireille Muhoza
h2. Experiment Overview
2
3 39 Stephen Kay
The 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 binds 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 the 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 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. 
4 2 Mireille Muhoza
5 38 Stephen Kay
The E12-07-105 experiment is an exclusive measurement of the L/T separated pion electroproduction cross section, it aims 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 the 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 conducting a measurement of the Q2 dependence of the 
6
π+ longitudinal and transverse cross sections. A significant longitudinal response may be indicative of the realisation 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 of the 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 the Hall C High Momentum Spectrometer (HMS) and Super High Momentum Spectrometer (SHMS). We will extract the cross sections using the Rosenbluth technique. In additon, measurements in non-parallel kinematics will allow for simultaneous extraction of the interference terms and serve as a test of t-dependence of the π+ cross section. 
7 4 Mireille Muhoza
8 1 Mireille Muhoza
----
9 28 Mireille Muhoza
10 43 Garth Huber
h2. E12-06-101 and E12-07-105 Documents
11 28 Mireille Muhoza
12 46 Garth Huber
* Proposals:
13 45 Garth Huber
https://misportal.jlab.org/mis/physics/experiments/viewProposal.cfm?paperId=512
14
https://misportal.jlab.org/mis/physics/experiments/viewProposal.cfm?paperId=680
15
16 31 Mireille Muhoza
* "Hall C Wiki":https://hallcweb.jlab.org/wiki/index.php/Main_Page
17
* "Hall C Electronic Logbook":https://logbooks.jlab.org/book/hclog
18
* "Hall C Information":https://www.jlab.org/physics/hall-c
19
* "Experiment Schedule":https://www.jlab.org/physics/experiments/schedule
20 1 Mireille Muhoza
21
----
22
23
h2. Run Information
24
25 28 Mireille Muhoza
* [[Run Plans and Run Sheets]] 
26 42 Stephen Kay
* "PionLT Specific Shift Instructions":https://hallcweb.jlab.org/wiki/index.php/Pion-LT_specific_shift_instructions
27 41 Stephen Kay
* "Online Analysis Instructions":https://hallcweb.jlab.org/wiki/index.php/Pion-LT_analysis_instructions#Detailed_Online_Analysis_Instructions
28 37 Stephen Kay
* "Experimental Safety Asessment Documentation Summer 2019":https://hallcweb.jlab.org/safety-docs/Summer2019/ESAD.pdf
29
* "Conduct of Operations Summer 2019":https://hallcweb.jlab.org/safety-docs/Summer2019/ESAD.pdf
30 1 Mireille Muhoza
* "Information for Shift Takers":https://hallcweb.jlab.org/wiki/index.php/Information_for_Shift_Takers
31 28 Mireille Muhoza
* "Documentation for Running Hall C":https://www.jlab.org/Hall-C/document/manuals.html
32 31 Mireille Muhoza
* "Beam Schedule":https://www.jlab.org/exp_prog/experiment_schedule/2019/20190225.0.pdf
33 34 Stephen Kay
* "Shift Signup":https://misportal.jlab.org/mis/apps/physics/shiftSchedule/index.cfm?experimentRunId=HALLC-SPRING-2019
34 36 Stephen Kay
* "Shift Signup, read only":https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=HALLC-SPRING-2019
35 31 Mireille Muhoza
* Hall C How-Tos: "1":https://hallcweb.jlab.org/document/howtos/ , "2":https://hallcweb.jlab.org/wiki/index.php/How-to
36 28 Mireille Muhoza
* "Analysis on Cdaq":https://hallcweb.jlab.org/wiki/index.php/Analysis_How-to
37
* "Contact Experts":https://hallcweb.jlab.org/wiki/index.php/Experts_on_call
38
39
----
40 1 Mireille Muhoza
41 28 Mireille Muhoza
h2. Data Analysis
42 1 Mireille Muhoza
43 33 Stephen Kay
* "UTIL_PION Git Repository":https://github.com/JeffersonLab/UTIL_PION
44 31 Mireille Muhoza
* "SIMC":https://hallcweb.jlab.org/wiki/index.php/SIMC_Monte_Carlo
45
* "Hall C Analyzer":https://hallcweb.jlab.org/wiki/index.php/ROOT_Analyzer
46
* [[Online Replay Histograms]]
47 32 Mireille Muhoza
* "Joint Hall A & C Data Analysis":https://redmine.jlab.org/projects/podd/wiki/Workshop2018
48 31 Mireille Muhoza
* "L/T Separation Software":https://github.com/billlee77/omega_analysis (see Sec 4.2 of https://misportal.jlab.org/ul/publications/view_pub.cfm?pub_id=15234 for description)
49 1 Mireille Muhoza
50 28 Mireille Muhoza
----
51 1 Mireille Muhoza
52 28 Mireille Muhoza
h2. Meetings
53
54 40 Stephen Kay
* "Hall C Commissioning Analysis Meetings":https://hallcweb.jlab.org/wiki/index.php/Commissioning_analysis_meetings
55 28 Mireille Muhoza
* "Detector Working Group Meetings":https://hallcweb.jlab.org/wiki/index.php/Detector_Working_Group_Meetings#Detector_Working_Group_Meetings_in_2017
56
* [[Pion LT Meetings]]
57
* [[BlueJeans Information]]  
58
59
----
60
61
h2. Collaboration
62
63
64
* [[Spokespersons]]
65
* [[Collaboration List]]
66
* [[Mailing List]]