198,723 research outputs found
Search for a scalar partner of the top quark in the jets plus missing transverse momentum final state at root s=13 TeV with the ATLAS detector
No full textA search for pair production of a scalar partner of the top quark in
events with four or more jets plus missing transverse momentum is
presented. An analysis of 36.1 fb(-1) of root s = 13 TeV proton-proton
collisions collected using the ATLAS detector at the LHC yields no
significant excess over the expected Standard Model background. To
interpret the results a simplified supersymmetric model is used where
the top squark is assumed to decay via (t) over tilde (1) -> t((*))
(chi) over tilde (0)(1) and (t) over tilde (1) -> b (chi) over tilde
(+/-)(1) -> bW((*)) (chi) over tilde (0)(1), where (chi) over tilde
(0)(1) ((chi) over tilde (+/-)(1) denotes the lightest neutralino
(chargino). Exclusion limits are placed in terms of the top-squark and
neutralino masses. Assuming a branching ratio of 100\% to t (chi) over
tilde (0)(1), top-squark masses in the range 450-1000 GeV are excluded
for (chi) over tilde (0)(1) masses below 160 GeV. In the case where
m((t) over tilde1) similar to m(t) + m((chi) over tilde 10), top-squark
masses in the range 235-590 GeV are excluded
Search for new phenomena in high-mass diphoton final states using 37 fb(-1) of proton-proton collisions collected at root(s) = 13 TeV with the ATLAS detector
No full textSearches for new phenomena in high-mass diphoton final states with the
ATLAS experiment at the LHC are presented. The analysis is based on pp
collision data corresponding to an integrated luminosity of 36.7 fb(-1)
at a centre-of-mass energy root s = 13 TeV recorded in 2015 and 2016.
Searches are performed for resonances with spin 0, as predicted by
theories with an extended Higgs sector, and for resonances with spin 2,
using a warped extra-dimension model as a benchmark model, as well as
for non-resonant signals, assuming a large extra-dimension scenario. No
significant deviation from the Standard Model is observed. Upper limits
are placed on the production cross section times branching ratio to two
photons as a function of the resonance mass. In addition, lower limits
are set on the ultraviolet cutoff scale in the large extra-dimensions
model. (C) 2017 The Author(s). Published by Elsevier B.V
Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton-proton collisions at the LHC
No full textThis paper presents the method and performance of primary vertex
reconstruction in proton-proton collision data recorded by the ATLAS
experiment during Run 1 of the LHC. The studies presented focus on data
taken during 2012 at a centre-of-mass energy of root s = 8 TeV. The
performance has been measured as a function of the number of
interactions per bunch crossing over a wide range, from one to seventy.
The measurement of the position and size of the luminous region and its
use as a constraint to improve the primary vertex resolution are
discussed. A longitudinal vertex position resolution of about 30 mu m is
achieved for events with high multiplicity of reconstructed tracks. The
transverse position resolution is better than 20 mu m and is dominated
by the precision on the size of the luminous region. An analytical model
is proposed to describe the primary vertex reconstruction efficiency as
a function of the number of interactions per bunch crossing and of the
longitudinal size of the luminous region. Agreement between the data and
the predictions of this model is better than 3\% up to seventy
interactions per bunch crossing
Determination of the strong coupling constant alpha(s) from transverse energy-energy correlations in multijet events at root s=8 TeV using the ATLAS detector
No full textMeasurements of transverse energy-energy correlations and their
associated asymmetries in multi-jet events using the ATLAS detector at
the LHC are presented. The data used correspond to vs = 8 TeV
proton-proton collisions with an integrated luminosity of 20.2 fb(-1).
The results are presented in bins of the scalar sum of the transverse
momenta of the two leading jets, unfolded to the particle level and
compared to the predictions from Monte Carlo simulations. A comparison
with next-to-leading-order perturbative QCD is also performed, showing
excellent agreement within the uncertainties. From this comparison, the
value of the strong coupling constant is extracted for different energy
regimes, thus testing the running of alpha(s)(mu) predicted in QCD up to
scales over 1 TeV. A global fit to the transverse energy-energy
correlation distributions yields alpha(s)(m(Z)) = 0.1162 +/- 0.0011
(exp.)(-0.0070)(+0.0084) (theo.), while a global fit to the asymmetry
distributions yields a value of alpha(s)(m(Z)) = 0.1196 +/- 0.0013
(exp.)(-0.0045)(+0.0075) (theo.)
Search for heavy resonances decaying to a W or Z boson and a Higgs boson in the qq -bar (') bb -bar final state in pp collisions at root s = 13 T eV with the AT L A S detector
No full textAbstract not availableM. Aaboud ... D. Duvnjak … P. Jackson …L. Lee ... A. Petridis … M. J. White … et al. (ATLAS Collaboration
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Search for supersymmetry in final states with two same-sign or three leptons and jets using 36 fb−1 of sqrt(s) = 13 TeV pp collision data with the ATLAS detector
No full textA search for strongly produced supersymmetric particles using signatures involving multiple energetic jets and either two isolated same-sign leptons (e or μ), or at least three isolated leptons, is presented. The analysis relies on the identification of b-jets and high missing transverse momentum to achieve good sensitivity. A data sample of proton-proton collisions at sqrt(s) = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015 and 2016, corresponding to a total integrated luminosity of 36.1 fb−1, is used for the search. No significant excess over the Standard Model prediction is observed. The results are interpreted in several simplified supersymmetric models featuring R-parity conservation or R-parity violation, extending the exclusion limits from previous searches. In models considering gluino pair production, gluino masses are excluded up to 1.87 TeV at 95% confidence level. When bottom squarks are pair-produced and decay to a chargino and a top quark, models with bottom squark masses below 700 GeV and light neutralinos are excluded at 95% confidence level. In addition, model-independent limits are set on a possible contribution of new phenomena to the signal region yields
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