A Study of Anomalous Production of Z-Bosons with High Transverse Momentum at the Tevatron
	We present a broad search for signatures containing a high transverse  momentum Pt Z boson in 0.94 pb-1 of CDF-II data. In addition to inclusive production of  Z's with large values of Pt, we investigate  signatures that have a  much smaller Standard Model crossection, and hence are more sensitive to new phenomena, such as right-handed heavy quarks, technicolor particles, gauginos or squarks, or excited states resulting from  large extra dimensions. The specific channels in   which we search are of the form Z + X + anything and Z + X + Y + anything, where X and  Y can be leptons, photons, missing energy, or large total transverse energy ($H_T$). For each signature we compare the observed Pt(Z) spectra and other distributions with Standard Model expectations.  Alas, we do not see anything striking, yet.

• Authors: AlexanderParamonov , Henry J. Frisch, Stephen Levy, Carla Pilcher, and Collin Wolfe
• Blessed: August 17, 2006
  
• Godparents: none
• Data: Run II, 0.94  fb^-1
• Internal Documentation:  CDF Note 8316 (PDF)
• Public Note: CDF Note 8452 (PDF)

^{Plots and Tables:}

Z --> e+e- Inclusive part.
	Invariant mass (left) and transverse momentum (right) for Z --> ee. The two lower plots show the difference between the numbers of expected and observed events divided by the number expected. A mass cut of 66 < M(ee) < 116 GeV has been applied to the right-hand plot.  PDF or GIF.
	The Bayesian limit on the differential cross section for anomalous Z --> ee production at 95% CL. PDF or GIF
Signature Part Z+X+anything X Observed Expected +\sigma -\sigma Lepton 3 1.6 0.3 0.3 Photon 14 12.4 1.5 1.5 Missing Energy 97 85.4 12.3 12.3 Ht 45 36 4.9 5.8 Z+X+Y+anything X+Y Observed Expected +\sigma -\sigma Lepton+Photon 0 0.001 0.001 0.001 Lepton+Missing Energy 1 0.72 0.11 0.11 Lepton+Ht 0 0.16 0.04 0.04 Photon+Missing Energy 1 0.24 0.20 0.20 Photon+Ht 1 0.80 0.34 0.23 Missing Energy+Ht 6 6.6 1.0 1.0
Z --> µ+µ- Inclusive part.
	Invariant mass (left) and transverse momentum (right) for Z --> µ+µ-. The two lower plots show the difference between the numbers of expected and observed events divided by the number expected. A mass cut of 66 < M(µµ) < 116 GeV has been applied to the right-hand plot.  PDF or GIF.
	The Bayesian limit on the differential cross section for anomalous Z --> µµ production at 95% CL. PDF or GIF
Signature Part Z+X+anything X Observed Expected +\sigma -\sigma Lepton 2 2.4 0.4 0.4 Photon 14 15.0 1.8 1.8 Missing Energy 74 55.9 9.7 5.8 Ht 53 41.3 5 5.2 Z+X+Y+anything X+Y Observed Expected +\sigma -\sigma Lepton+Photon 0 0.001 0.001 0.001 Lepton+Missing Energy 0 0.8 0.1 0.1 Lepton+Ht 0 0.14 0.05 0.04 Photon+Missing Energy 0 0.19 0.21 0.10 Photon+Ht 0 0.28 0.14 0.13 Missing Energy+Ht 6 3.5 0.5 0.5

Event Displays

1. Z-> ee  + Missing Energy

2. Z->ee + Lepton + Missing energy