1,722,322 research outputs found
V+jets production at the CMS
Get PDFMeasurements of Vector Boson production in association with jets are presented, using p-p collision data at √s = 7 TeV. The measurements presented include Z + jets azimuthal correlations, event shapes, vector boson + jets differential cross section measurements, hard double-parton scattering using W + jets events and electroweak Z + forward - backward jet production
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Differential Z + jet cross section measurements at 8 TeV
No full textAbstractThe measurement of differential cross section of a Z boson produced in association with jets is presented. The cross section is presented with respect to various jet kinematic variables where the Z bosons are reconstructed from opposite sign lepton pairs. The analysis is based on data of proton proton collisions with the centre of mass energy of 8 TeV collected in 2012 by the CMS experiment at LHC corresponding to 19.8 fb−1 of integrated luminosity. Obtained results are compared with different generators and are shown to be consistent with the Standard Model predictions
Vector Boson production with heavy flavor quarks from CMS experiment at LHC
No full textIn this paper, a brief outlook on the measurements of the total and differential cross-sections of vector bosons production associated with heavy flavor quarks performed using CMS proton - proton collision data taken at center of mass energies of 7, 8, and 13 TeV is presented. Obtained results are compared with predictions of various state-of-the-art Monte-Carlo generators.In this paper, a brief outlook on the measurements of the total and differential cross-sections of vector bosons production associated with heavy flavor quarks performed using CMS proton - proton collision data taken at center of mass energies of 7, 8, and 13 TeV is presented. Obtained results are compared with predictions of various state-of-the-art Monte-Carlo generators
Measurements of Standard Model heayy particle production in association with jets using proton-proton collision data at 8 and 13 TeV with the CMS experiment at the LHC
No full textStandard Model (SM) of particle physics is the theory describing the main building blocks of matter and their interactions. In this thesis, two different measurements are carried out adding confidence to SM using proton proton collision data collected by the CMS experiment at the LHC . Within the first study, multi-dimensional differential cross section measurements are carried out with respect to several kinematic variables of Z bosons and jets, where the Z bosons are reconstructed from opposite sign lepton (electron or muon) pairs. This measurement using 8 TeV data is the most precise Z + jet cross section measurement among other hadron collision measurements up to now. Theoretical calculations using state-of-the-art techniques are compared with the CMS measurements obtained in this measurement, and therefore provided a stringent test of those calculations. It is proven here that calculations involving higher orders in QCD describe the CMS results better. Within the second study, measurement of Underlying Event (UE) activity accompa- nying top quark pair events is carried out using 13 TeV data. UE here corresponds to other parton collisions and remnants of protons accompanying the collision of phys- ical interest. Since UE includes non-perturbative QCD effects, it can not be exactly calculated, hence it is included parametrically into Monte-Carlo simulations. These parameters are "tuned" using existing experimental results. The validity of these tunes is proven in the highest known mass scale of particle physics, namely the top scale, in this study
W/Z physics with the ATLAS and CMS Experiments
No full textIn this document, an overview of the studies of physics processes involving W and Z bosons with the ATLAS and
CMS Experiments is presented. The presented results include measurements of fiducial and normalized cross
sections, branching fractions of W bosons, forward-backward asymmetry of Drell--Yan lepton pairs,
as well as the first observation of a Z boson decaying into charm quarks. The obtained results provide stringent
tests of the modeling of these processes at the highest precision available for the calculations
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
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