[Brahms-l] Fwd: STAR new paper on the measurement of W-boson AL in 500 GeV p+p collisions at RHIC

FYI



> From: Nu Xu <nxu_at_lbl.gov>
> Date: August 17, 2010 4:02:28 AM EDT
> To: Barbara Jacak <jacak_at_skipper.physics.sunysb.edu>, Flemming  
> Videbaek <videbaek_at_bnl.gov>, Wit Busza <busza_at_MIT.EDU>, Steven  
> Vigdor <vigdor_at_bnl.gov>
> Cc: Nu Xu <nxu_at_lbl.gov>
> Subject: STAR new paper on the measurement of W-boson AL in 500 GeV p 
> +p collisions at RHIC
>
> Dear Barbara, Wit, Flemming and Steve,
>
> I am pleased to announce that the STAR collaboration will submit to  
> Physical Review Letters,  in one week's time,  a new paper on the  
> first measurement of single-spin asymmetry (AL) of W in 500 GeV p+p  
> collisions at RHIC. The title and abstract are included below.
>
> Best regards,
>
> Nu Xu
>
> -----------------------------------------------------------------------
>  Nu Xu
>
>  Build. 510A, I-181	    Phone:  (631)344-3471
>  P.O. Box 5000, BNL	    Fax:       (631)344-4206
>  Upton, NY11973		
>     	    				    Mobile: (510)289-8119
>  MS70R0319, NSD         Phone:  (510)495-2951
>  LBNL        			    Fax:       (510)486-4818
>  Berkeley, CA94720	    http://www-rnc.lbl.gov/~nxu		
> -----------------------------------------------------------------------
>
> Title: "Measurement of the parity-violating longitudinal single-spin  
> asymmetry for $W^{\pm}$ boson production in polarized proton-proton  
> collisions at $\sqrt{s}$ = 500 GeV"
>
> Abstract: "We report the first measurement of the parity violating  
> single-spin asymmetries for midrapidity decay positrons and  
> electrons from $W^+$ and $W^-$ boson production in longitudinally  
> polarized proton-proton collisions at $\sqrt{s}$ = 500 GeV by the  
> STAR experiment at RHIC. The measured asymmetries, $A_{L}^{W^+}$ =  
> &#8722;0.27 \pm 0.10 (stat.) \pm 0.02 (syst.) \pm 0.03 (norm.) and  
> $A_{L}^{W^-}$ = 0.14 ± 0.19 (stat.) \pm 0.02 (syst.) \pm 0.01  
> (norm.), are consistent with theory predictions, which are large and  
> of opposite sign. These predictions are based on polarized quark and  
> antiquark distribution functions constrained by polarized DIS  
> measurements."
>
>



_______________________________________________
Brahms-l mailing list
Brahms-l_at_lists.bnl.gov
https://lists.bnl.gov/mailman/listinfo/brahms-l