Difference between revisions of "Dec 14, 2021 PrimEx-Eta (informal) Calibration & Analysis Meeting"
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== Time and Place == | == Time and Place == | ||
− | * Time: Tuesday, Dec | + | * Time: Tuesday, Dec 14, 2021 at 10:30 am EST. |
* Room: Online | * Room: Online | ||
== Meeting Connections == | == Meeting Connections == | ||
+ | Join ZoomGov Meeting | ||
+ | https://jlab-org.zoomgov.com/j/1603338968?pwd=RE82K09ocHlMUVdVZXAwRTh1ZmF6dz09 | ||
− | + | Meeting ID: 160 333 8968 | |
+ | Passcode: 237672 | ||
+ | One tap mobile | ||
+ | +16692545252,,1603338968# US (San Jose) | ||
+ | +16468287666,,1603338968# US (New York) | ||
− | + | Dial by your location | |
− | + | +1 669 254 5252 US (San Jose) | |
+ | +1 646 828 7666 US (New York) | ||
+ | +1 551 285 1373 US | ||
+ | +1 669 216 1590 US (San Jose) | ||
+ | 833 568 8864 US Toll-free | ||
+ | Meeting ID: 160 333 8968 | ||
+ | Find your local number: https://jlab-org.zoomgov.com/u/abf7wcfSu1 | ||
− | Join | + | Join by SIP |
− | + | 1603338968@sip.zoomgov.com | |
+ | |||
+ | Join by H.323 | ||
+ | 161.199.138.10 (US West) | ||
+ | 161.199.136.10 (US East) | ||
+ | Meeting ID: 160 333 8968 | ||
+ | Passcode: 237672 | ||
==Agenda== | ==Agenda== | ||
Line 35: | Line 53: | ||
==Minutes== | ==Minutes== | ||
+ | |||
+ | Present: Ilya, Tyler, Sasha, & ig | ||
+ | |||
+ | # Sasha was working in the hall | ||
+ | # Tyler reported the tagger calibration status. The calibration is done for each run, mostly automatically, but for some runs a fine-hand-tuning is needed. | ||
+ | # ig is learning how to use OSG to be able to launch the FCAL calibration. ig had some questions regarding the azimuthal angle difference between BCAL and SC. The expectation is that there should be a peak at zero degrees but the simulation (w/o magnetic field) shows a peak at ~ -45 degree. Ilya thinks that it is probably a bad alignment. ig will check the DB. | ||
+ | # Ilya explains the difference between eta & pi0 Primakoff cross-section calculation. | ||
+ | #* Form factor has a Real and Imaginary parts | ||
+ | #* eta has two form factors: Coulomb and Strong. The Strong FF can be tuned to the data by changing the nucleus radius. | ||
+ | #* pi0 has three form factors: one for Coulomb and two for Strong. The Strong FFs was tuned by changing the Silicon nucleus radius. | ||
+ | #* In both cases the interference has two terms cosinus phi (proportional to the Real part product) and sinus phi (proportional to Im part product). The phase angle is known for pi0 but not for eta. | ||
+ | #* For pi0, at small angle there is an integration problem that requires a parabolic approximation only for the Coulomb FF. |
Latest revision as of 12:48, 14 December 2021
Time and Place
- Time: Tuesday, Dec 14, 2021 at 10:30 am EST.
- Room: Online
Meeting Connections
Join ZoomGov Meeting https://jlab-org.zoomgov.com/j/1603338968?pwd=RE82K09ocHlMUVdVZXAwRTh1ZmF6dz09
Meeting ID: 160 333 8968 Passcode: 237672 One tap mobile +16692545252,,1603338968# US (San Jose) +16468287666,,1603338968# US (New York)
Dial by your location
+1 669 254 5252 US (San Jose) +1 646 828 7666 US (New York) +1 551 285 1373 US +1 669 216 1590 US (San Jose) 833 568 8864 US Toll-free
Meeting ID: 160 333 8968 Find your local number: https://jlab-org.zoomgov.com/u/abf7wcfSu1
Join by SIP 1603338968@sip.zoomgov.com
Join by H.323 161.199.138.10 (US West) 161.199.136.10 (US East) Meeting ID: 160 333 8968 Passcode: 237672
Agenda
- Announcements
- Status of Calibrations
- Run Validation phase I -- https://halldweb.jlab.org/wiki/index.php/RunPeriod-2019-01_Validation
- Run Validation phase II -- https://halldweb.jlab.org/wiki/index.php/RunPeriod-2021-08_Validation
- Calibration Updates:
- Tagger (Tyler)
- PS & Alignment (Sasha)
- FCAL (ig)
- CCAL (Drew)
- Analysis Updates:
- Drew
- Tyler
- ig
- MC simulation Updates
- Production (ig)
Minutes
Present: Ilya, Tyler, Sasha, & ig
- Sasha was working in the hall
- Tyler reported the tagger calibration status. The calibration is done for each run, mostly automatically, but for some runs a fine-hand-tuning is needed.
- ig is learning how to use OSG to be able to launch the FCAL calibration. ig had some questions regarding the azimuthal angle difference between BCAL and SC. The expectation is that there should be a peak at zero degrees but the simulation (w/o magnetic field) shows a peak at ~ -45 degree. Ilya thinks that it is probably a bad alignment. ig will check the DB.
- Ilya explains the difference between eta & pi0 Primakoff cross-section calculation.
- Form factor has a Real and Imaginary parts
- eta has two form factors: Coulomb and Strong. The Strong FF can be tuned to the data by changing the nucleus radius.
- pi0 has three form factors: one for Coulomb and two for Strong. The Strong FFs was tuned by changing the Silicon nucleus radius.
- In both cases the interference has two terms cosinus phi (proportional to the Real part product) and sinus phi (proportional to Im part product). The phase angle is known for pi0 but not for eta.
- For pi0, at small angle there is an integration problem that requires a parabolic approximation only for the Coulomb FF.