Search for new particles leading to Z+jets final states in <script type="math/tex">p\overline{p}</script> collisions at <script type="math/tex">\sqrt{s}</script>=1.96 TeV

Aaltonen, T.; Van Remortel, N.; et al.

doi:10.1103/PHYSREVD.76.072006

Title

Search for new particles leading to Z+jets final states in $p\overline{p}$ collisions at $\sqrt{s}$ =1.96 TeV

Author

Aaltonen, T.

Van Remortel, N.

et al.

Institution/Organisation

CDF Collaboration

Abstract

We present the results of a search for new particles that lead to a Z boson plus jets in pp̅ collisions at √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 tt̅ 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/c2 are excluded at 95% confidence level.

Language

English

Source (journal)

Physical review : D : particles, fields, gravitation, and cosmology / American Physical Society. - Ridge, N.Y., 2004 - 2015

Physical review : D : particles and fields. - Lancaster, Pa, 1970 - 2003

Publication

Ridge, N.Y. : American Physical Society , 2007

ISSN

1550-7998 [print]

1550-2368 [online]

DOI

10.1103/PHYSREVD.76.072006