Transverse Single-Spin Asymmetry and Cross-Section for $\pi^0$ and $\eta$ Mesons at Large Feynman-$x$ in Polarized p+p Collisions at $\sqrt{s}$ = 200 GeV
 

Phys. Rev. D 86, 051101(R) (2012) [7 pages]

    arXiv: 1205.6826


Fig. 2(c). A_N vs. Diphoton invariant mass

   
         

Mgg

AN

Stat

   

0.034222

0.095798

0.06202

   

0.077292

0.044589

0.017283

   

0.125569

0.07096

0.006019

   

0.160391

0.051147

0.008233

   

0.216565

0.055722

0.024002

   

0.269198

-0.000161

0.031425

   

0.319539

-0.023824

0.033759

   

0.370035

0.056012

0.035082

   

0.420121

0.011681

0.034715

   

0.471206

0.010928

0.031691

   

0.520368

0.04768

0.02797

   

0.569306

0.09031

0.027956

   

0.618182

0.043817

0.032119

   

0.668204

0.023525

0.038316

   

0.718357

-0.031239

0.047623

   

0.767928

-0.01479

0.060094

   
         
         
         

Fig. 4. pi0 Cross-section at <eta>=3.68

 
         

xF

pT (GeV)

X-section

Total Err.

 

0.4324

2.18362

4.144282e-01

1.023353e-01

 

0.5138

2.59469

4.801078e-02

8.285174e-03

 

0.5938

2.99869

5.567711e-03

1.305052e-03

 

0.672

3.3936

3.674281e-04

1.447252e-04

 

0.749

3.78245

1.156800e-05

9.402461e-06

 
         
         
         

Fig. 4. eta Cross-section at <eta>=3.68

 
         

xF

pT (GeV)

X-section

Total Err.

 

0.4356

2.19978

1.845303e-01

4.107512e-02

 

0.516

2.6058

2.838823e-02

4.348075e-03

 

0.5946

3.00273

3.336223e-03

7.714102e-04

 

0.672

3.3936

2.766108e-04

1.242356e-04

 

0.7486

3.78043

2.760219e-06

3.429388e-06

 
         
         
         

Fig. 4. eta/pi0 Cross-section Ratio at <eta>=3.68

         

xF

pT (GeV)

X-sec Ratio

Total Err.

 

0.4324

2.18362

4.452648e-01

1.217367e-01

 

0.5138

2.59469

5.912887e-01

5.059341e-02

 

0.5938

2.99869

5.992091e-01

9.061854e-02

 

0.672

3.3936

7.528298e-01

2.323879e-01

 

0.749

3.78245

2.386082e-01

2.552341e-01

 
         
         
         

Fig. 5. pi0 Transverse Single Spin Asymmetry (A_N) at <eta>=3.68

         

xF

AN

Stat

Sys

 

0.415669

0.03924

0.003515

0.002055

 

0.4656

0.059743

0.00606

0.002876

 

0.515531

0.079633

0.010594

0.00376

 

0.565395

0.071087

0.018915

0.003352

 

0.615399

0.091034

0.034829

0.004267

 

0.664631

0.173352

0.064719

0.008173

 

0.714242

-0.004505

0.132876

0.000798

 
         
         
         

Fig. 5. eta Transverse Single Spin Asymmetry (A_N) at <eta>=3.68

         

xF

AN

Stat

Sys

 

0.417527

0.035057

0.024704

0.015957

 

0.466506

0.034567

0.028893

0.009116

 

0.515691

0.096412

0.043405

0.008589

 

0.565472

0.17407

0.066645

0.010781

 

0.61538

0.234831

0.120537

0.016788

 

0.667679

0.361046

0.19825

0.03056

 

0.713333

0.390547

0.403675

0.064254

 
 

For any questions please contact STAR Physics Analysis Coordinator : Xin Dong - XDong@lbl.gov