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inclusive-jet-cross-section-measurement-200-gev-proton-proton-collisions-star-paper-proposal

Updated on Tue, 2016-01-26 23:17 by surrow. Originally created by xuanli on 2015-02-16 15:29.

Title: Measurement of the inclusive jet cross-section at mid-rapidity at STAR in  proton-proton collisions at √s=200GeV at RHIC 

 

PA: Xuan Li and Bernd Surrow

Proposed Target Journal: Physical Review D

Documentation:

  • Analysis detail presentation
  • PN
  • Paper Draft 1.0
  • GPC 


Abstract: 

We report the measurement of the inclusive jet cross-section at midrapidity in polarized proton-proton collisions at $\sqrt{s}=200\,$GeV by the STAR experiment at RHIC based on the anti-kT jet reconstruction algorithm with a cone radius of R=0.6. The measured inclusive jet cross-section  in three pseudorapidity regions ($|\eta| < 1$, $0.5 < |\eta| < 1$ and $|\eta|<0.5$) is compared to NLO calculations for three different sets of unpolarized parton distribution functions of CT10, MRST-W and NNPDF. Generally, good agreement is found comparing the measured inclusive jet cross-section to NLO calculations taking into account hadronization and underlying event effects. The inclusive jet cross-section probes unpolarized gluon distribution functions at high-$x$ where uncertainties remain sizeable. 

Tables:

  • Table 1: Final cross-section results (<pT>, pT range, Cross-section mean value, Statistical uncertainity, Systematic uncertainty)

  • Table 2: Underlying and Hadronization corrections applied to NLO Calculations (<pT>, pT range, Correction factor)


Figures:


Figure 1:  STAR Detector setup in 2009.




Figure 2:  BEMC jet patch mapping.




Figure 3:  Data / MC comparison.

 

Figure 4:  Unfolding matrix.

Figure 5:  Systematic errors.

Figure 6:  Comparison of inclusive jet cross-section for Periiod 1 and Period 2 (See text for details!).

Figure 7:  Inclusive jet cross-section in comparison to NLO calculations based on the  CT10, MRST-W and NNPDF unploarized pdf set.




Figure 8: Ratio of Inclusive Jet Cross-Section of (Data-Theory(CT10)) / Theory(CT10).

 


 

Figure 9: Ratio of Inclusive Jet Cross-Section of (Data-Theory(MRSTW)) / Theory(MRSTW).

Figure 10: Ratio of Inclusive Jet Cross-Section of (Data-Theory(NNPDF)) / Theory(NNPDF).



 

Summary:


In summary, this paper reports the measurment of the inclusive jet cross-section at midrapidity in polarized proton-proton collisions at $\sqrt{s}=200\,$GeV by the STAR experiment at RHIC based on the anti-kT jet reconstruction algorithm with a cone radius of R=0.6. The measured inclusive jet cross-section  in three pseudorapidity regions (|$\eta$| < 1, 0.5 < |$\eta$| < 1 and |$\eta$|<0.5) is compared to NLO calucations for three different sets of unpolarized parton distribution functions of CT10, MRST-W and NNPDF including theoretical scale uncertainities. Generally, good agreement is found comparing the measured inclusive jet cross-section to NLO calculations taking into account hadronization and underlying event effects. The sensitive Bjorken-$x$ range probed at $\sqrt{s}=200\,$GeV in polarized proton-proton collisions amounts to roughly $0.05<x<0.2$. Among all three unpolarized parton distribution functions, a slight preference for the unpoalrized parton distribution function set of CT10 is found. The inclusive jet cross-section probes unpolarized gluon distribution functions at high-$x$ where uncertainties remain sizeable.
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