Attendees: Guang Yang (GY), Ciro Riccio (CR), Chang Kee Jung (CKJ), Abraham Teklu (AT), Alex Ramirez (AR), Andriaseta Sitraka (AS), Eric Chong (EC), Ki-Young Jung (KYJ), Shih-Kai Lin (SL), Sunwoo Gwon (SG), Mikhail Danilov (MD), Cesar Jusus Valls (CJV), Nataliya Skrobova (NS), Perri Zilberam (PZ), Thorsten Lux (TL)

Eric Chong - Review of the event selection

CKJ: Is done in 3 or 2D? EC: in 3D.
CJV: How do you choose the voxel spread? EC: We project the voxel on the
CJV: If you have a diagonal cluster? CKJ: Is not looking at x, y or z, but at the projection along the second principal component analysis.
CKJ: Similar variables are used by collider physicist. Why you are calling this variable voxel spread and not length along second principal component?
GY: Do you apply linearity cut before or after voxel spread cut?EC: After.
CKJ: What the final goal of these cuts? EC: Select single tracks and reject blobs and kink track.
CKJ: Voxel spread is doing a good job!
CKJ: is the neutron energy on slide 10 the deposited energy? EC&GY: Neutron energy.
CKJ: Try to optimize the linearity and voxel spread cuts trying to improve the efficiency.
CR: We can use CERN TB but temperature is different. We want to compare LANL 20 m data with CERN data since there the temperature should be similar.
CR: Extreme changes in MC to see the impact on extinction coefficient.
CR: Other cuts under development. I've presented them 3 meeting ago.
CJV: It is not just MPPC efficiency, but also other effect like the tyvek etc. GY: This will be convoluted in Eric's later results.

Guang Yang - Task list and plans

CKJ: What is useful for SFGD from neutron TB analysis. This group should make a regular report to the SFGD meeting. GY: I will give a talk at next meeting.
CKJ: Slide 9: the amount of spread you are having is a direct reflection of the invisible scattering. If we could change the relative ratio of elastic scattering inside GEANT4. GY: More channels contribute to invisible scattering.