Z+Jets Inclusive Cross Section Analysis
IFAE-Barcelona
IFAE-Barcelona


Authors

Stefano Camarda (camarda@fnal.gov)

Monica D'Onofrio (donofrio@fnal.gov)

Sebastian Grinstein (gris@fnal.gov)

Mario Martínez (mmp@fnal.gov)

Lorenzo Ortolan (loreorto@ifae.es)

Veronica Sorin (vsorin@fnal.gov)

CDF, FNAL, M.S. 318
P.0. Box 500
Batavia, Illinois 60510
USA


Measurement of the Inclusive Jet Cross Sections in Z/γ*(→&mu+&mu-)+jets Production
(2.37 fb-1 analysis)

We present results on inclusive Z/γ*(→&mu+&mu-)+jets production in p-pbar collisions at √s = 1.96 TeV using data collected with the upgraded Collider Detector at Fermilab in Run II corresponding to an integrated luminosity of 2.37 fb-1. Jets are reconstructed using the Midpoint algorithm with R=0.7. Measurements are performed as a function of jet transverse momentum and jet rapidity for jets with pTjet>30 GeV/c and |yjet|<2.1. The measurements are corrected to the hadron level and compared to NLO pQCD predictions, the latter including additional parton-to-hadron non-pQCD contributions.



  • Blessed Results 2.37 fb-1
    The measurements are performed in the kinematic range defined as:
    • Two central muons , |η&mu| < 1.0 , with PT > 25 GeV
    • Z mass window: 66 < M&mu&mu < 116 GeV/c2
    • ΔR(&mu,jet) > 0.7
    Jets are searched for using the MidPoint algorithm with R=0.7.
    Measurements are defined for hadron level jets with pTjet > 30 GeV/c and |yjet| < 2.1.

    • Inclusive jet cross section in Z/γ*+≥1 jet and Z/γ*+≥2 jets production as a function of pTjet
      Measured inclusive cross section for Z/γ*+jets production as a function of pTjet compared to NLO pQCD predictions as determined using MCFM. The pQCD prediction includes an additional Chad factor that accounts for non-pQCD contributions. Systematic uncertainties on data and theoretical predictions are included.

      • Inclusive jet cross section in Z/γ*+≥1 jet gif & eps (Relative contributions to the total systematic uncertainty gif & eps)
      • Inclusive jet cross section in Z/γ*+≥2 jets gif & eps (Relative contributions to the total systematic uncertainty gif & eps)



    • Total Inclusive Cross Section vs Inclusive Jet Multiplicity gif & eps
      Measured cross section as a function of inclusive jet multiplicity compared to NLO pQCD predictions as determined using MCFM. In the ratio plot, data and NLO theory are referred to LO predictions. Systematic uncertainties on data and theoretical predictions are included.


    • Inclusive jet cross section in Z/γ*+≥1 jet and Z/γ*+≥2 jets production as a function of |yjet|
      Measured inclusive cross section for Z/γ*+jets production as a function of |yjet| compared to NLO pQCD predictions as determined using MCFM. The pQCD prediction includes an additional Chad factor that accounts for non-pQCD contributions. Systematic uncertainties on data and theoretical predictions are included.

      • Inclusive jet cross section in Z/γ*+≥1 jet gif & eps (Relative contributions to the total systematic uncertainty gif & eps)
      • Inclusive jet cross section in Z/γ*+≥2 jets gif & eps (Relative contributions to the total systematic uncertainty gif & eps)



    • M&mu&mu mass distribution
      Measured M&mu&mu invariant mass distribution for data compared to the SM prediction (only statistical uncertainties included) :
      • in events with at least one jet gif & eps.
      • in events with at least two jets gif & eps.




            Last modified by Stefano Camarda (camarda@fnal.gov) on February 11, 2010