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Título

Search for new particles leading to Z plus jets final states in p(p)over-bar collisions at sqrt{s}=1.96 TeV

Otros títulosSearch for new particles leading to Z+jets final states in pp̅ collisions at √s=1.96  TeV
Autor Aaltonen, T.; Ruiz Jimeno, Alberto ; Chuang, S. H. ; Cuenca Almenar, Cristóbal ; Gómez, G. ; Palencia, Enrique ; Cuevas, Javier ; Rodrigo, Teresa ; Piedra, Jonatan ; Cabrera, Susana ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío ; Casal, Bruno
Palabras clave Central Electromagnetic Calorimeter
Z(0) Boson
CDF-II
Detector
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Fecha de publicación 18-oct-2007
EditorAmerican Physical Society
Citación Physical Review D 76(7): 072006 (2007)
ResumenWe present the results of a search for new particles that lead to a Z boson plus jets in p(p)over-bar collisions at sqrt{s}=1.96 TeV using the Collider Detector at Fermilab (CDF II). A data sample with a luminosity of 1.06 fb(-1) collected using Z boson decays to ee and μμ is used. We describe a completely data-based method to predict the dominant background from standard model Z + jet events. This method can be similarly applied to other analyses requiring background predictions in multijet environments, as shown when validating the method by predicting the background from W + jets in t(t)over-bar production. No significant excess above the background prediction is observed, and a limit is set using a fourth generation quark model to quantify the acceptance. Assuming BR(b'--> bZ)=100% and using a leading-order calculation of the b' cross section, b' quark masses below 268 GeV/c^2 are excluded at 95% confidence level.
Descripción 24 pages, 38 figures.-- PACS nrs.: 13.85.Rm; 13.85.Qk; 14.70.Hp; 14.80.-j.-- CDF Collaboration: et al.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevD.76.072006
URI http://hdl.handle.net/10261/9039
DOI10.1103/PhysRevD.76.072006
ISSN1550-7998
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