General Meson SF Meeting Summary 10/17/24

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PARTICIPANTS: Dandan Zheng, Abdennacer Hamdi, C.C. Ye, Caoyang shen, Casey Morean, Craig Roberts, David Richards, Tanja Horn, Garth Huber, Haoran Zhang, Jose Rodriguez Quintero, Junaid, Love Preet, njucui, Tyler Hague, Weizhi Xiong, Yang Yu, Yaqi Cui, Yulia Furletova, Zhao-qian Yao, Zhen-Ni Xu, Zihan Yu, Avnish Singh, Yuchen Hu, Adnan Bashir, Haole Ma, Keyu Guo, Ke-xin zeng, Cedric Mezrag, bxy, yuyang Xiao,

Pion Boer-Mulders function using a contact interaction (DanDan Cheng)

• two nonzero TMDs calculated

• can these TMDs be calculated for all kT/bT? Connection between kT and bT ranges used in lattice and calculations.

• lattice has three points but cannot be extended to the whole range
• calculation can be done over whole range and compare to the three points

• Lattice calculation by Engelhart -

• Lattice groups in general seem currently focused on topics related to evolution
• David's groups work is focused on GPDs but could in principle be extended to TMD calculations - he will look into it, but needs to finish the current work first
• Action: investigate if lattice calculation can be done to check the one by Engelhart

Pion Form Factor Projections for EIC (Love Preet)

• Action: please provide generator for the EPIC software stack

• uniform around 4mr for ZDC for coverage in reconstructed neutron

• how confident on uncertainties at around Q2~25 GeV2 - there, statistics dominated (at lower values of Q2 systematics dominated)

• compared to previous plots now showing 10 fb^-1 that is expected for early science - as typical for a collider luminosity is expecte to ramp up over time to the ultimate possible value.
• question is then how to present the uncertainties in comparison to theory - if show the initial science only then people might be sceptical about the discovery potential

• Action: think about how to present the ultimate potential of EIC, e.g., the error bars at final expected luminosity.

• Reconstruction now more sophisticated than during first level (no cluster merging algorithms and only one cluster) - now there are all clusters included

• Weighting: how is it included in this generator? Needs to be implemented in the overall EPIC software stack too.

NEXT MEETING: THURSDAY 21 NOVEMBER AT 9:00AM ET