[Brahms-l] Fwd: STAR new paper on Ridge

FYI
>
> per on Ridge
>
> Dear Barbara, Wit, Flemming and Steve,
>
> I am pleased to announce that the STAR collaboration will submit to  
> Physical Review C,  in one week's time,  a new paper on  long range  
> rapidity correlations and jet production in high energy nuclear  
> collisions. 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: "Long range rapidity correlations and jet production in high  
> energy nuclear collisions"
>
> Abstract: "The STAR Collaboration at RHIC presents a systematic  
> study of high transverse momentum charged di-hadron correlations at  
> small azimuthal pair separation $\Delta \phi$, in d+Au and central  
> Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Significant correlated 
>  yield for pairs with large longitudinal separation $\Delta \eta$ is  
> observed in central Au+Au, in contrast to d+Au collisions. The  
> associated yield distribution in $\Delta \eta$ X $\Delta \phi$ can  
> be decomposed into a narrow jet-like peak at small angular  
> separation which has a similar shape to that found in d+Au  
> collisions, and a component which is narrow in $\Delta \phi$ and  
> depends only weakly on $\Delta \eta$, the "\ridge". Using two  
> systematically independent analyses, finite ridge yield is found to p 
> ersist for trigger $p_t$ > 6 GeV/c, indicating that it is correlated  
> with jet production. The transverse momentum spectrum of hadrons
> comprising the ridge is found to be similar to that of bulk particle  
> production in the measured range (2 < $p_t$ < 4 GeV/c)."



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