Single spin asymmetry

Last modified by Dmitri Smirnov on 16-08-2012

Measurements of $A_{N}$ in pp —> pp

~1990, E704 at FNAL, √s = 19.4 GeV

• Published References#Akchurin:1993xd
• First measurement of $A_{N}$ in the CNI region
• ${\sqrt {s}}=19.4~{\text{GeV}}$
• 200 GeV/c polarized proton beam obtained from the decay of $\Lambda$ hyperons
• $0.001<|t|<0.032~({\text{GeV}}/c)^{2}\!\,$

2003, PP2PP at BNL (RHIC Run 3), √s = 200 GeV

• Published References#Bultmann:2005na
• ${\sqrt {s}}=200~{\text{GeV}}$
• $\sigma _{\text{tot}}=51.6~{\text{mb}},\rho =0.13$
• $0.01<|t|<0.03~({\text{GeV}}/c)^{2}\!\,$
• Re r5 = −0.033 ± 0.035 and Im r5 = −0.43 ± 0.56

2004, H-jet at BNL (RHIC Run 4), √s = 13.7 GeV

• Published References#Okada:2005gu
• 100 GeV/c polarized proton beam on H-jet target
• ${\sqrt {s}}=13.7~{\text{GeV}}$
• $\sigma _{\text{tot}}=38.4~{\text{mb}},\rho =-0.08,\delta _{C}=0.02,b=12~({\text{GeV}}/c)^{-2}$
• $0.001<|t|<0.032~({\text{GeV}}/c)^{2}\!\,$
• Re r5 = −0.0008 ± 0.0091 and Im r5 = −0.015 ± 0.029

Stat. only
Stat. + Syst.

2004, H-jet at BNL (RHIC Run 4), √s = 6.8 GeV

• Published References#Alekseev:2009zza also includes results for double spin asymmetry $A_{NN}$
• 24 GeV/c polarized proton beam on H-jet target
• ${\sqrt {s}}=6.8~{\text{GeV}}$
• $\sigma _{\text{tot}}=38.4~{\text{mb}}$
• $0.001<|t|<0.032~({\text{GeV}}/c)^{2}\!\,$

Stat. only
Stat. + Syst.

2009, H-jet at BNL (RHIC Run 9), √s = 7.7 GeV

• SPIN 2010
• 31 GeV/c polarized proton beam on H-jet target
• ${\sqrt {s}}=7.7~{\text{GeV}}$
• Failed to parse (syntax error): {\displaystyle \operatorname{Re}\, r_5 = −0.055 \pm x.x, \operatorname{Im}\, r_5 = −0.016 \pm x.x}

These data are from Sasha. I don't have the numbers to check the fits

File:Pp ANvst s007.7 Hjet 2009 31GeV AN.png	File:Pp ANvst s007.7 Hjet 2009 31GeV ell.png

2009, H-jet at BNL (RHIC Run 9), √s = 13.7 GeV

• 100 GeV/c polarized proton beam on H-jet target
• ${\sqrt {s}}=13.7~{\text{GeV}}$

Blue
Yellow

2009, H-jet at BNL (RHIC Run 9), √s = 21.7 GeV

• SPIN 2010
• 250 GeV/c polarized proton beam on H-jet target
• ${\sqrt {s}}=21.7~{\text{GeV}}$
• Failed to parse (syntax error): {\displaystyle \operatorname{Re}\, r_5 = −0.002 \pm x.x, \operatorname{Im}\, r_5 = −0.005 \pm x.x}

These data are from Sasha. I don't have the numbers to check the fits

File:Pp ANvst s021.7 Hjet 2009 250GeV AN.png	File:Pp ANvst s021.7 Hjet 2009 250GeV ell.png

2009, PP2PP at STAR BNL (RHIC Run 9), √s = 200 GeV

• ${\sqrt {s}}=200~{\text{GeV}}$
• $\sigma _{\text{tot}}=51.6~{\text{mb}},\rho =0.13$
• $\operatorname {Re} \,r_{5}=0.00167\pm 0.0017\pm 0.0061,\operatorname {Im} \,r_{5}=0.00722\pm 0.030\pm 0.049$

Stat.
Stat. + Syst.

2011, H-jet at BNL (RHIC Run 11), √s = 21.7 GeV

• 250 GeV beams
• ${\sqrt {s}}=21.7~{\text{GeV}}$

2012, H-jet at BNL (RHIC Run 12), √s = 6.8 GeV

• ${\sqrt {s}}=6.8~{\text{GeV}}$

2012, H-jet at BNL (RHIC Run 12), √s = 13.7 GeV

• ${\sqrt {s}}=13.7~{\text{GeV}}$

2012, H-jet at BNL (RHIC Run 12), √s = 21.9 GeV

• ${\sqrt {s}}=21.9~{\text{GeV}}$

Measurements of $A_{N}$ in pC —> pC

1. E950 at AGS, BNL (2002), References#Tojo:2002wb
   • ${\sqrt {s}}=21.7~{\text{GeV}}$
   • $0.009<|t|<0.041~({\text{GeV}}/c)^{2}\!\,$
   • Re r5 = −0.088 ± 0.058 and Im r5 = −0.161 ± 0.226

   
   

2. p-Carbon polarimeter at RHIC, BNL (2004) ${\sqrt {s}}$ = 100 GeV (unpublished)

More Reading

• References#Nachtmann:2003ik - A theoretical connection between the Regge theory and QCD physics
• References#Buttimore:1998rj
• http://nuclth02.phys.ulg.ac.be/compete/predictor/

Last modified by Dmitri Smirnov on 16-08-2012