A Study of Anomalous Production of Z-Bosons with High Transverse Momentum at the Tevatron

As part of a broad search for new heavy particles decaying into W and Z bosons, we have measured an upper limit on the anomalous production of Z bosons with large transverse momentum. The Z bosons, which are produced in p¯p collisions at 1.96 TeV at the Fermilab Tevatron, are studied in the e⁺e^- and µ⁺µ^- final states using the CDF detector. The integrated luminosity of the data samples is 305 pb^-1. In addition to the comparison with the Standard Model, we have compared the results with the predictions of a specific model, proposed by Bjorken, Pakvasa, and Tuan [1], of heavy right-handed quarks that decay into the W, Z, and Higgs bosons.

Authors: AlexanderParamonov , Henry J. Frisch, Stephen Levy, Carla Pilcher, and Collin Wolfe
Blessed: March 2nd, 2006
Godparents: none
Data: Run II, 305 pb^-1
Documentation: CDF Note 8033 (PDF)
Public Note: CDF Note 8164 (PDF)

^{Plots and Tables:}

Z --> e⁺e^-
	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.
	A comparison of Ht (scalar sum Et over all objects in an event) for the Z --> ee data and SM MC. The distributions are calculated for three subsamples of Z --> ee with different cuts on Pt(Z) >: 0 GeV, 60 GeV, and 120 GeV. The mass cut of 66 < M(ee) < 116 GeV has been applied. PDF or GIF.
	The measured distributions for missing Et are compared to SM expectations for three subsamples of Z --> ee with different cuts on PT (Z) >: 0 GeV, 60 GeV, and 120 GeV. The mass cut of 66 < M(ee) < 116 GeV has been applied. PDF or GIF.
	The measured distributions for the number of jets in data compared to SM expectation for subsamples of Z --> ee with PT (Z) cuts ( > 0 GeV, > 60 GeV, and > 120 GeV). The mass cut of 66 < M(ee) < 116 GeV has been applied. PDF or GIF

	The measured distributions for the numbers of photons in data compared to SM expectations for Z --> ee subsamples PT (Z) cuts ( > 0 GeV, > 60 GeV, and > 120 GeV). The mass cut of 66 < M(ee) < 116 GeV has been applied. PDF or GIF
	The measured distributions for the number of leptons in data compared to the SM expectations for the Z --> ee sample with different PT (Z) cut. The mass cut of 66 < M(ee) < 116 GeV has been applied. PDF or GIF
	cos( alpha) (alpha is an angle between vector-P(Z) and positively charged lepton in the rest frame of the Z) is for subsamples of Z --> ee with PT (Z) cuts ( > 0 GeV, > 60 GeV, and > 120 GeV). The mass cut of 66 < M(ee) < 116 GeV has been applied. PDF or GIF
	cos( theta) denotes the angle between e+ and e in the rest frame of the CDF. The distributions are made for Z --> ee with different cuts on PT (Z). PDF or GIF
	The Bayesian limit on the differential cross section for anomalous Z --> ee production at 95% CL. PDF or GIF
Z --> µ⁺µ^-
	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.
	A comparison of Ht (scalar sum Et over all objects in an event) for the Z --> µ⁺µ^- data and SM MC. The distributions are calculated for three subsamples of Z --> µ⁺µ^- with different cuts on Pt(Z) >: 0 GeV, 60 GeV, and 120 GeV. The mass cut of 66 < M(µµ) < 116 GeV has been applied. PDF or GIF.
	The measured distributions for missing Et are compared to SM expectations for three subsamples of Z --> µ⁺µ^- with different cuts on PT (Z) >: 0 GeV, 60 GeV, and 120 GeV. The mass cut of 66 < M(µµ) < 116 GeV has been applied. PDF or GIF.
	The measured distributions for the number of jets in data compared to SM expectation for subsamples of Z --> µ⁺µ^- with PT (Z) cuts ( > 0 GeV, > 60 GeV, and > 120 GeV). The mass cut of 66 < M(µµ) < 116 GeV has been applied. PDF or GIF
	The measured distributions for the numbers of photons in data compared to SM expectations for Z --> µ⁺µ^- subsamples PT (Z) cuts ( > 0 GeV, > 60 GeV, and > 120 GeV). The mass cut of 66 < M(µµ) < 116 GeV has been applied. PDF or GIF
	The measured distributions for the number of leptons in data compared to the SM expectations for the Z --> µ⁺µ^- sample with different PT (Z) cut. The mass cut of 66 < M(µµ) < 116 GeV has been applied. PDF or GIF
	Cos( alpha) (alpha is an angle between vector-P(Z) and positively charged lepton in the rest frame of the Z) is for subsamples of Z --> µ⁺µ^- with PT (Z) cuts ( > 0 GeV, > 60 GeV, and > 120 GeV). The mass cut of 66 < M(µµ) < 116 GeV has been applied. PDF or GIF
	cos( theta) denotes the angle between µ⁺ and µ^- in the rest frame of the CDF. The distributions are made for Z --> µ⁺µ^- with different cuts on PT (Z). PDF or GIF
	The Bayesian limit on the differential cross section for anomalous Z --> µµ production at 95% CL. PDF or GIF

Page was last updated Ferbuary 14th, 2006 by Alexander Paramonov.
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