Yellow Report Physics Semi-Inclusive Reactions

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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





==

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
Kaon momentum ep 18x275 .gif
Pion momentum ep 18x275 .gif


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
Pion momentum ep 5x41 .gif
Kaon momentum ep 5x41 .gif


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
Kin map 10x100 dl theta lam.png
Kin map 10x100 e theta gamma.png
Kin map 10x100 p theta pion.png
Kin map 10x100 p theta proton.png
Kin map 10x100 p theta lam.png