R10: The (W + >= 1 Jet)/(W Inclusive) Cross Section Ratio

Contact Person: Jay Dittmann (dittmann@fnal.gov)

Abstract

We present a measurement of the (W + >=1 Jet)/(W Inclusive) cross section ratio (R10) in W -> e nu events for jet Et thresholds ranging from 15 to 95 GeV. Using W -> e nu candidates from Fermilab Tevatron Runs 1A and 1B, we compare the measured values of R10 to NLO QCD predictions calculated using the DYRAD Monte Carlo program. Comparisons are made for both 0.4 and 0.7 jet cone clustering. Good agreement between data and theory is observed over a large range of jet Et thresholds for both cone sizes.

Blessed Plots for 0.4 and 0.7 Jet Cones

Comparisons of Data to Perturbative QCD Predictions (DYRAD)

Differential Cross Section vs. Leading Jet Et

diff_04_pdf.eps --- NEW!: dsigma(W + >=1 Jet)/dEt vs. Leading Jet Et (0.4) -- MRSA' and CTEQ4M
diff_07_pdf.eps --- NEW!: dsigma(W + >=1 Jet)/dEt vs. Leading Jet Et (0.7) -- MRSA' and CTEQ4M

Differential Cross Section vs. Leading Jet Et --- (Data - Theory)/Theory

diff_04_qsq_nlo_dmt_mrsa.eps --- NEW!: dsigma(W + >=1 Jet)/dEt vs. Leading Jet Et (0.4) -- MRSA', Q^2 scale variations
diff_07_qsq_nlo_dmt_mrsa.eps --- NEW!: dsigma(W + >=1 Jet)/dEt vs. Leading Jet Et (0.7) -- MRSA', Q^2 scale variations

Various plots of the W + >=1 Jet Cross Section vs. Jet Etmin

xsec_04_lo_mrsa.eps --- NEW!: sigma(W + >=1 Jet) vs. Jet Etmin (0.4) -- MRSA', with LO
xsec_07_lo_mrsa.eps --- NEW!: sigma(W + >=1 Jet) vs. Jet Etmin (0.7) -- MRSA', with LO
xsec_47_als_30.eps --- NEW!: sigma(W + >=1 Jet) vs. alpha_s(M_Z) at Jet Etmin = 30 (0.4 and 0.7) with MRSA and CTEQ4 PDFs
xsec_47_pdf_dmt_mrsa.eps --- NEW!: (Data - Theory)/Theory for sigma(W + >=1 Jet) vs. Jet Etmin (0.4 and 0.7) -- MRSA', Q^2 variations
xsec_47_pdf_dmt_mrsa_cteq4.eps --- NEW!: (Data - Theory)/Theory for sigma(W + >=1 Jet) vs. Jet Etmin (0.4 and 0.7) -- MRSA' and CTEQ4M

R10 vs. Jet Etmin

r10_04_pdf.eps: R10 vs. Jet Etmin (0.4) -- MRSA' and CTEQ4M
r10_07_pdf.eps: R10 vs. Jet Etmin (0.7) -- MRSA' and CTEQ4M
r10_04_pdf_mrsa.eps: R10 vs. Jet Etmin (0.4) -- MRSA family: variable alphas
r10_04_pdf_cteq4.eps: R10 vs. Jet Etmin (0.4) -- CTEQ4 family: variable alphas
r10_07_pdf_mrsa.eps: R10 vs. Jet Etmin (0.7) -- MRSA family: variable alphas
r10_07_pdf_cteq4.eps: R10 vs. Jet Etmin (0.7) -- CTEQ4 family: variable alphas
r10_04_qsq_nlo_cteq4.eps: R10 vs. Jet Etmin (0.4)-- CTEQ4M, Q^2 scale variations (dotted lines)
r10_07_qsq_nlo_cteq4.eps: R10 vs. Jet Etmin (0.7) -- CTEQ4M, Q^2 scale variations (dotted lines)
r10_04_qsq_nlo_band.eps: R10 vs. Jet Etmin (0.4) -- CTEQ4M, Q^2 scale variations (shaded band)
r10_07_qsq_nlo_band.eps: R10 vs. Jet Etmin (0.7) -- CTEQ4M, Q^2 scale variations (shaded band)
r10_47_pdf_mrsa.eps: R10 vs. Jet Etmin (0.4 and 0.7) -- MRSA'
r10_47_pdf_band_mrsa.eps: R10 vs. Jet Etmin (0.4 and 0.7) -- MRSA', with Q^2 scale band
r10_04_lo_cteq4.eps: R10 vs. Jet Etmin (0.4) -- CTEQ4M, with LO
r10_07_lo_cteq4.eps: R10 vs. Jet Etmin (0.7) -- CTEQ4M, with LO

R10 vs. Jet Etmin --- (Data - Theory)/Theory

r10_47_pdf_dmt_mrsa.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.4 and 0.7) -- MRSA'
r10_47_pdf_dmt_mrsa_cteq4.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.4 and 0.7) -- nominal MRSA' w/ CTEQ4M overlayed
r10_47_pdf_dmt_mrsa_mrst.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.4 and 0.7) -- nominal MRSA' w/ MRST overlayed
r10_04_pdf_dmt_both.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.4) -- MRSA' and CTEQ4M
r10_07_pdf_dmt_both.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.7) -- MRSA' and CTEQ4M
r10_04_pdf_dmt_cteq4.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.4) -- CTEQ4 family
r10_07_pdf_dmt_cteq4.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.7) -- CTEQ4 family
r10_04_pdf_dmt_mrsa.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.4) -- MRSA family
r10_07_pdf_dmt_mrsa.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.7) -- MRSA family
r10_04_qsq_nlo_dmt_cteq4.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.4) -- CTEQ4M, Q^2 scale variations
r10_07_qsq_nlo_dmt_cteq4.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.7) -- CTEQ4M, Q^2 scale variations
r10_04_qsq_nlo_dmt_mrsa.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.4) -- MRSA', Q^2 scale variations
r10_07_qsq_nlo_dmt_mrsa.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.7) -- MRSA', Q^2 scale variations
r10_04_lo_dmt_cteq4.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.4) -- CTEQ4M, with LO
r10_07_lo_dmt_cteq4.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.7) -- CTEQ4M, with LO
r10_04_lo_dmt_mrsa.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.4) -- MRSA', with LO
r10_07_lo_dmt_mrsa.eps: Ratio of R10(Data)-R10(QCD) to R10(QCD) vs. Jet Etmin (0.7) -- MRSA', with LO

More LO/NLO Comparisons

r10_04_lo_nlo_ratio.eps: Ratio of R10(LO)-R10(NLO) to R10(NLO) vs. Jet Etmin (0.4) -- CTEQ4M
r10_07_lo_nlo_ratio.eps: Ratio of R10(LO)-R10(NLO) to R10(NLO) vs. Jet Etmin (0.7) -- CTEQ4M
r10_47_lo_nlo_ratio_mrsa.eps: Ratio of R10(LO)-R10(NLO) to R10(NLO) vs. Jet Etmin (0.4 and 0.7) -- MRSA'
r10_47_lo_nlo_ratio_cteq4.eps: Ratio of R10(LO)-R10(NLO) to R10(NLO) vs. Jet Etmin (0.4 and 0.7) -- CTEQ4M

R10 vs. alpha_s

r10_47_als_30.eps: R10 vs. alpha_s(M_Z) at Jet Etmin = 30 (0.4 and 0.7) with MRSA and CTEQ4 PDFs
r10_04_als_30_60.eps: R10 vs. alpha_s(M_Z) at Jet Etmin = 30,60 (0.4) with MRSA and CTEQ4 PDFs
r10_07_als_30_60.eps: R10 vs. alpha_s(M_Z) at Jet Etmin = 30,60 (0.7) with MRSA and CTEQ4 PDFs

R10(0.7) / R10(0.4)

r10_rat74_nlo.eps: R10(0.7)/R10(0.4) with both LO and NLO theory (MRSA')
r10_rat74_lo_nlo.eps: R10(0.7)/R10(0.4) with NLO theory (MRSA')
r10_rat74_lo_nlo_nosmear.eps: R10(0.7)/R10(0.4) with both LO and NLO theory (MRSA') -- no jet smearing!

Supporting Plots: Backgrounds

r10_04_bck_1j.eps
r10_07_bck_1j.eps: W + >=1 Jet Backgrounds vs. Jet Etmin
r10_04_bck_1j_frac.eps
r10_07_bck_1j_frac.eps: W + >=1 Jet Background fractions vs. Jet Etmin
r10_04_bck_qcd.eps
r10_07_bck_qcd.eps: W + >=1 Jet Background (QCD Multijet) vs. Jet Etmin
r10_04_bck_top.eps
r10_07_bck_top.eps: W + >=1 Jet Background (Top) vs. Jet Etmin
r10_04_bck_wtn.eps
r10_07_bck_wtn.eps: W + >=1 Jet Background (W -> tau nu) vs. Jet Etmin
r10_04_bck_zee.eps
r10_07_bck_zee.eps: W + >=1 Jet Background (Z -> e e) vs. Jet Etmin
r10_04_bck_ztt.eps
r10_07_bck_ztt.eps: W + >=1 Jet Background (Z -> tau tau) vs. Jet Etmin
r10_04_bck_xjt.eps
r10_07_bck_xjt.eps: W + >=1 Jet Background (Extra intractions, Photon) vs. Jet Etmin
r10_04_bck_all.eps
r10_07_bck_all.eps: W + >=1 Jet Background (Combined) vs. Jet Etmin

Supporting Plots: Acceptances and Efficiencies

r10_04_ae_acc.eps
r10_07_ae_acc.eps: W -> e nu Geometric + Kinematic acceptance vs. Jet Etmin
r10_04_ae_id.eps
r10_07_ae_id.eps: W -> e nu Electron ID efficiency vs. Jet Etmin
r10_04_ae_ovl.eps
r10_07_ae_ovl.eps: W -> e nu Electron-Jet overlap efficiency vs. Jet Etmin
r10_04_ae_trig.eps
r10_07_ae_trig.eps: W -> e nu Electron trigger efficiency vs. Jet Etmin
r10_04_ae_all.eps
r10_07_ae_all.eps: Combined W -> e nu Acceptance + Efficiencies vs. Jet Etmin
r10_04_ae_all_2.eps
r10_07_ae_all_2.eps: Combined W -> e nu Acceptance + Efficiencies vs. Jet Etmin (zoom-in)

Last updated February 14, 1999

dittmann@fnal.gov