Key Physics Observables

Measurement/Process (and responsible co-convener)	Main Detector requirements	Anticipated figures	Comments
Quark Sivers, 3D, TMD momentum structure, TMD evolution from singleevolution from singleevolution from single evolution from single hadrons. 3D image ( 𝑥, 𝑘T) of the T) of the T) of the SiversFunction, Evolution test of Sivers at intermediate 𝑥, Tensor charge via Collins FF Alexey Vladimirov	• 𝜂 acceptance for • angular resolution • granularity of the detector (central to forward -1 to 4) • pi/K/p identification • Comments:PID↔Tracking , 𝐵−field, Dp/p, min p	• pseudo 3D Sivers function as a function of kt for various x bins • Value of Tensor charge uncertainties + plot vs uncertainties vs x • Q2 dependence of Sivers function at fixed x
Gluon Sivers function via dijets/dihadron , probe the size of Sivers Funciton Bowen Xiao	acceptance for back-to-back dihadrons/jets resolution for the momentum (mainly high pT) and azimuthal angle	Size of asymmetry as a function of x
Spectroscopy possibilities: Representive channels: X,Y states, J/Psipipi,DD* Justin Stevens	dilepton identification for J/Psi displaces vertices pi/K separation for open charm forward proton/neutron recoils for diffractive production	kinematic coverage for decay particles in representive channels, expected limits on coupling vs mass of J/Psi pipi and DD* final states
Sea Quark helicity measurements flavor separated (anti) quark helicity distributions over wide range of x Ralf Seidl	default SIDIS + hadron momentum and energy resolution in forward direction (2-4) for CC eventsw	Update of previous sea quark helicity uncertainty figures
(nuclear) Fragmentation functions and distribution functions: single hadron fragmentation for ep/eA Ralf Seidl	similar to TMD SIDIS requirements	nFF uncertaintyimpact figures
dihadron correlations in eA: low x, probing onset of saturation Bowen Xiao	backward hadron acceptance, sufficiently high resolution for the momentum (mainly high pT) and azimuthal angle/granularity (need 2π coverage).	decorrelation plot as in white paper
dihadron fragmentation functions for Tensor charge and Boer-Mulders function Anselm Vossen	similar to TMD requirements low z(momentum) acceptance for partial wave expansion	impact on tensor charge/transversity extraction projected Boer-Mulders asymmetries
Lambda related spin meaurements: Long./Trans. spin transfer, polarizing FFs Anselm Vossen	Lambda acceptance slow pion requires low momentum cutoff displaces vertex forward photon reco for Sigma feed-down	Precision of Lambda polarization measuremetns

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Kinematic coverage files

This section summarizes the kinematics studies of the SIDIS working group. We have simulated the following processes:

Main single hadron analysis of the process e+p->e'hX , highest energy option

Many other final state kinematic requirements such as for di-hadrons (both back-to-back or not) can be derived from these files.
Main DIS cuts: Q2>1, 0.01< y < 0.95, W2 > 10 GeV, |eta|<4,
SIDIS cuts: |eta|<4, all z and pT
Species and energies used: 18 GeV electrons on 275 GeV protons
Generator used: pythiaeRHIC (/cvmfs/eic.opensciencegrid.org/x8664_sl7/MCEG/releases/env/pro/bin/pythiaeRHIC)
Generator input file:ff
ROOT file containing a small tree of simulated data (containing scattered lepton p_e,theta_e and hadrons p_h, theta_h and idhep): https://www.dropbox.com/s/v2cdw9rdz533a31/ep_noradcor.18x275_YR_Treepf_2.root?dl=0

Main single hadron analysis of the process e+p->e'hX , lowest energy option

Many other final state kinematic requirements such as for di-hadrons (both back-to-back or not) can be derived from these files.
Main DIS cuts: Q2>1, 0.01<y<0.95, w2="">10 GeV2, |eta|<4f</y<0.95,>
SIDIS cuts: |eta|<4, all z and pT
Species and energies used: 5 GeV electrons on 41 GeV protons
Generator used: pythiaeRHIC (/cvmfs/eic.opensciencegrid.org/x8664_sl7/MCEG/releases/env/pro/bin/pythiaeRHIC)
Generator input file:ff
ROOT file containing a small tree of simulated data (containing scattered lepton p_e,theta_e and hadrons p_h, theta_h and idhep): https://www.dropbox.com/s/967dqqjhey9k883/ep_noradcor.5x41_YR_Treepf_2.root

Inclusive Lambda Production

Q2 > 1. Here xF > 0 is shown, but link to all xF trees is also given. Main physics interest is in current fragmentation with xF> 0, but target fragmentation (xF<0) is also of interest.* Species and energies: ep with 5x41, 5x100, 10x100, 18x275. Plots on this page are for 10x100 option to save space, but trees are included for the other options as well. The script takes the name of the tree file as an argument
Generator used: pythiaRHIC with default settings
root file and scripts for xF > 0 is located at https://duke.box.com/s/acheyxsr6nw4w5nfb6xi9m8axr28dyao and for all xF at https://duke.box.com/s/dy1lvjpiv4pgtksrg1o2i9wl9b25kody
NB: in addition to the kinematics of the proton and pion from Lambda->p pi-, we also show the kinematics of the photon from Sigma->Lambda+gamma. Differentiating primary lambdas from feed-down is crucial and needs appropriate mass resolution of Lambda and Sigma
NB2: We also show the displaced vertex distance. The impact of the displaced vertex on the tracking performance has not been evaluated with fast simulations yet as it would need a concrete detector implementation.
NB3: Obviously the minimum pT for slow pion acceptance will be crucial