Simulations of Single- Spin Asymmetries from SIDIS @ EIC Xin Qian Kellogg, Caltech EIC Meeting at CUA, July 29- 31, 2010 1.TMD in SIDIS 2.Simulation of SIDIS 3.Projections Thanks to M. Huang, H. Gao and J.-P. Chen for slides/dicussions Thanks to J. She, A. Prokudin and Z. B. Zhong for calculations.
40
Embed
Simulations of Single-Spin Asymmetries from SIDIS @ EIC Xin Qian Kellogg, Caltech EIC Meeting at CUA, July 29-31, 2010 1.TMD in SIDIS 2.Simulation of SIDIS.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Simulations of Single-Spin Asymmetries from SIDIS @ EIC
Xin QianKellogg, Caltech
EIC Meeting at CUA, July 29-31, 2010
1. TMD in SIDIS2. Simulation of SIDIS3. Projections
Thanks to M. Huang, H. Gao and J.-P. Chen for slides/dicussionsThanks to J. She, A. Prokudin and Z. B. Zhong for calculations.
Equal stat. for proton and neutron (combine 3He and D)
Similar for D
11 + 60 GeV 11 + 100 GeV
P 36 d (3x1034/cm2/s) 36 d (3x1034/cm2/s)
D 72 d 72 d3He 72 d 72 d
Q2 & x coverage
Q2=x y ss defines how low x and how high Q2 we can achieve
Electron• Forward angle, lose
high-Q2 coverage• Lower momentum,
lose high-x coverage
Cross Section in MC• Low PT cross-section:
– A. Bacchetta hep-ph/0611265 JHEP 0702:093 (2007)
• High PT cross-section:– M. Anselmino et al. Eur. Phys. K. A31 373 (2007)
2 hH dPdddzdydx
d
hhhfe
fe
fe dddpdddp
d
cos cos
• K factor is assumed to be larger than 1– K factor is calculated to ensure the TMD calculation at PT = 0.8 GeV get
the same results as the large PT calculation at PT=1.2 GeV– VERY naïve interpolation between 0.8 and 1.2 GeV.
6x6 Jacobian calculation
22
22
2
)/exp(
zxyQ
zP
dPdddzdydx
d T
hH
Comparison with H. Avagyan (JLab)
• We choose the e + p --> e' + π+ + X channel as an example• Electron: 4 GeV + proton: 60 GeV• The phase space and kinematics cuts: Electron: 14°<θe<90° 0.7 GeV/c < Pe< 5 GeV/c
• x axis: log(x)/log(10)• y axis: the integrated cross section over the phase space of one
bin, then divided by the width of the x bin • Match nicely
Projections with D (neutron)
• 11 + 60 GeV 72 days• 3 + 20 GeV 72 days
D: 88% effective polarization Effective dilution
8
D π+ (z = 0.3-0.7)
All the following plots are based on 4x 50 energy configuration.Simulate in Phadron 0.1—50 GeV/c, θhadron 0—180 degreesQ2>1 GeV2, W>2.3 GeV, Mx>1.6 GeV, 0.05<y<0.8, 0.2<z<0.8To study the high hadron momentum (>10 GeV/c) effects