scholarly journals Measurement of thett¯production cross section inpp¯collisions ats=1.96  TeVusing events with large missing transverse energy and jets

2011 ◽  
Vol 84 (3) ◽  
Author(s):  
T. Aaltonen ◽  
B. Álvarez González ◽  
S. Amerio ◽  
D. Amidei ◽  
A. Anastassov ◽  
...  
Keyword(s):  
Cross Section ◽  
Production Cross Section ◽  
Transverse Energy ◽  
Production Cross ◽  
Missing Transverse Energy

MEASUREMENT OF THE $t\bar{t}$ PRODUCTION CROSS SECTION IN THE DILEPTON CHANNEL AT CDF

2005 ◽  
Vol 20 (14) ◽  
pp. 3174-3176
Author(s):  
◽  
REDA TAFIROUT
Keyword(s):  
Cross Section ◽  
Production Cross Section ◽  
Transverse Energy ◽  
Production Cross ◽  
Missing Transverse Energy ◽  
Dilepton Channel ◽  
Text Production ◽  
Dilepton Events ◽  
The Standard Model ◽  
Complementary Techniques

We report a measurement of the [Formula: see text] production cross section using dilepton events with jets and missing transverse energy in [Formula: see text] collisions at [Formula: see text]. Using 197 pb-1 of data recorded by the upgraded Collider Detector at Fermilab (CDF II), we use two complementary techniques to select candidate events. The combined result yields a [Formula: see text] production cross section of [Formula: see text] which is consistent with the Standard Model.

scholarly journals $$ t\overline{t}t\overline{t} $$ signatures through the lens of color-octet scalars

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
Linda M. Carpenter ◽  
Taylor Murphy ◽  
Matthew J. Smylie
Keyword(s):  
Cross Section ◽  
Transverse Energy ◽  
Production Cross ◽  
Top Quarks ◽  
Atlas Collaboration ◽  
Missing Transverse Energy ◽  
Color Octet ◽  
Section Measurement ◽  
Discovery Potential ◽  
New Phenomena

Abstract We reinterpret two recent LHC searches for events containing four top quarks $$ \left(t\overline{t}t\overline{t}\right) $$ t t ¯ t t ¯ in the context of supersymmetric models with Dirac gauginos and color-octet scalars (sgluons). We explore whether sgluon contributions to the four-top production cross section $$ \sigma \left( pp\to t\overline{t}t\overline{t}\right) $$ σ pp → t t ¯ t t ¯ can accommodate an excess of four-top events recently reported by the ATLAS collaboration. We also study constraints on these models from an ATLAS search for new phenomena with high jet multiplicity and significant missing transverse energy $$ \left({E}_{\mathrm{T}}^{\mathrm{miss}}\right) $$ E T miss sensitive to signals with four top quarks. We find that these two analyses provide complementary constraints, with the jets + $$ {E}_{\mathrm{T}}^{\mathrm{miss}} $$ E T miss search exceeding the four-top cross section measurement in sensitivity for sgluons heavier than about 800 GeV. We ultimately find that either a scalar or a pseudoscalar sgluon can currently fit the ATLAS excess in a range of reasonable benchmark scenarios, though a pseudoscalar in minimal Dirac gaugino models is ruled out. We finally offer sensitivity projections for these analyses at the HL-LHC, mapping the 5σ discovery potential in sgluon parameter space and computing exclusion limits at 95% CL in scenarios where no excess is found.

scholarly journals Measurements of the $t{\bar t}$ production cross section at the Tevatron Run II CDF experiment using b-tagging

2005 ◽  
Vol 20 (14) ◽  
pp. 3180-3182
Author(s):  
Henri Bachacou
Keyword(s):  
Cross Section ◽  
Top Quark ◽  
Production Cross Section ◽  
Transverse Energy ◽  
Production Cross ◽  
Secondary Vertex ◽  
Top Quark Mass ◽  
Lepton Jets ◽  
B Tagging ◽  
Text Signal

We present measurements of the [Formula: see text] production cross section in b-tagged lepton + jets events from [Formula: see text] collisions at 1.96 TeV using the CDF detector at Fermilab. B-jets are tagged with either a secondary vertex algorithm, or a soft lepton tagger that identifies muons from B hadron semileptonic decays. With Tevatron Run II data, we estimate the [Formula: see text] signal fraction in two different ways: by estimating the various background contributions, and by fitting directly the leading jet transverse energy spectrum for the signal and background contributions. A subset of the sample, with two secondary vertex tagged jets, yields a production cross section consistent with the inclusive measurements. Results are consistent with a Standard Model [Formula: see text] signal and current measurements of the top quark mass.

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