Publications (3)0 Total impact
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CDF Collaboration,
T. Aaltonen,
B. Alvarez González,
S. Amerio,
D. Amidei,
A. Anastassovx,
A. Annovi,
J. Antos,
G. Apollinari,
J. A. Appel, [......],
K. Yorita, T. Yoshidal,
G. B. Yu,
I. Yu,
S. S. Yu,
J. C. Yun,
A. Zanetti,
Y. Zeng,
C. Zhou,
S. Zucchelli
[show abstract]
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ABSTRACT: This Letter describes the current most precise measurement of the $WZ$
production cross section as well as limits on anomalous $WWZ$ couplings at a
center-of-mass energy of 1.96 TeV in proton-antiproton collisions for the
Collider Detector at Fermilab (CDF). $WZ$ candidates are reconstructed from
decays containing three charged leptons and missing energy from a neutrino,
where the charged leptons are either electrons or muons. Using data collected
by the CDF II detector (7.1 fb$^{-1}$ of integrated luminosity), 63 candidate
events are observed with the expected background contributing $8 \pm 1$ events.
The measured total cross section $\sigma (p \bar p \to WZ) =
3.93_{-0.53}^{+0.60}(\text{stat})_{-0.46}^{+0.59}(\text{syst}) $ pb is in good
agreement with the standard model prediction of $3.50\pm 0.21$. The same sample
is used to set limits on anomalous $WWZ$ couplings.
02/2012;
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T. Aaltonen,
B. Álvarez Gonzálezz,
S. Amerio,
D. Amidei,
A. Anastassovx,
A. Annovi,
J. Antos,
G. Apollinari,
J. A. Appel,
T. Arisawa, [......],
K. Yorita, T. Yoshidal,
G. B. Yu,
I. Yu,
S. S. Yu,
J. C. Yun,
A. Zanetti,
Y. Zeng,
C. Zhou,
S. Zucchelliee
[show abstract]
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ABSTRACT: The angular distributions of muons from Upsilon(1S,2S,3S) to mu+mu- decays
are measured using data from proton anti-proton collisions at sqrt(s)=1.96 TeV
corresponding to an integrated luminosity of 6.7 /fb and collected with the CDF
II detector at the Fermilab Tevatron. This analysis is the first to report the
full angular distributions as functions of transverse momentum pT for the
Upsilon mesons in both the Collins-Soper and s-channel helicity frames. This is
also the first measurement of spin alignment of Upsilon(3S) mesons. Within the
kinematic range of Upsilon rapidity |y|<0.6 and pT up to 40 GeV/c, the angular
distributions are found to be nearly isotropic.
12/2011;
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The CDF Collaboration,
T. Aaltonen,
J. Adelman,
B. Alvarez Gonzalez,
S. Amerio,
D. Amidei,
A. Anastassov,
A. Annovi,
J. Antos,
G. Apollinari, [......], T. Yoshidal,
G. B. Yu,
I. Yu,
S. S. Yu,
J. C. Yun,
A. Zanetti,
Y. Zeng,
X. Zhang,
Y. Zheng,
S. Zucchelli
[show abstract]
[hide abstract]
ABSTRACT: We study the underlying event in proton-antiproton collisions by examining
the behavior of charged particles (transverse momentum pT > 0.5 GeV/c,
pseudorapidity |\eta| < 1) produced in association with large transverse
momentum jets (~2.2 fb-1) or with Drell-Yan lepton-pairs (~2.7 fb-1) in the
Z-boson mass region (70 < M(pair) < 110 GeV/c2) as measured by CDF at 1.96 TeV
center-of-mass energy. We use the direction of the lepton-pair (in Drell-Yan
production) or the leading jet (in high-pT jet production) in each event to
define three regions of \eta-\phi space; toward, away, and transverse, where
\phi is the azimuthal scattering angle. For Drell-Yan production (excluding the
leptons) both the toward and transverse regions are very sensitive to the
underlying event. In high-pT jet production the transverse region is very
sensitive to the underlying event and is separated into a MAX and MIN
transverse region, which helps separate the hard component (initial and
final-state radiation) from the beam-beam remnant and multiple parton
interaction components of the scattering. The data are corrected to the
particle level to remove detector effects and are then compared with several
QCD Monte-Carlo models. The goal of this analysis is to provide data that can
be used to test and improve the QCD Monte-Carlo models of the underlying event
that are used to simulate hadron-hadron collisions.
03/2010;
