Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 31
Book Description
Measurement of Four-jet Production in Proton-proton Collisions at $\sqrt{s}$
Author: Studies of Inclusive Four-jet Production with Two [math Display
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Here, measurements are presented of the cross section for the production of at least four jets, of which at least two originate from b quarks, in proton-proton collisions. Data collected with the CMS detector at the LHC at a center-of-mass energy of 7 TeV are used, corresponding to an integrated luminosity of 3 pb-1. The cross section is measured as a function of the jet transverse momentum for pT> 20 GeV, and of the jet pseudorapidity for.
Study of Double Parton Scattering Using Four-Jet Scenarios
Author: Paolo GunnelliniPublisher: Springer
ISBN: 3319222139
Category : Science
Languages : en
Pages : 290
Book Description
This thesis addresses in a very new and elegant way several measurements and the extraction of so-called double parton scattering. The new and elegant way lies in the combination of measurements and a very smart extraction of double parton scattering results, which is easy to apply and overcomes many of the technical difficulties of older methods. Many new phenomena in particle physics can be observed when particles are collided at the highest energies; one of the highlights in recent years was the discovery of the Higgs boson at the Large Hadron Collider at CERN. Understanding the production mechanism of the Higgs boson at the LHC requires detailed knowledge of the physics of proton-proton collisions. When the density of partons in the protons becomes large, there is a non-negligible probability that more than one parton participates in the interaction and the so-called double parton scattering becomes important. In some cases very particular final state signatures can be observed, which can be regarded as an indication of such double partonic scattering and where the different interactions can be separated. Such multiple partonic interactions play an important role when precise predictions from known processes are required.
Differential Cross Section Measurements for the Production of a W Boson in Association with Jets in Proton-proton Collisions at $\sqrt S
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 26
Book Description
Our measurements are reported of differential cross sections for the production of a W boson, which decays into a muon and a neutrino, in association with jets, as a function of several variables, including the transverse momenta (pT) and pseudorapidities of the four leading jets, the scalar sum of jet transverse momenta (HT), and the difference in azimuthal angle between the directions of each jet and the muon. Furthermore, the data sample of pp collisions at a centre-of-mass energy of 7 TeV was collected with the CMS detector at the LHC and corresponds to an integrated luminosity of 5.0 fb-1. The measured cross sections are compared to predictions from Monte Carlo generators, MADGRAPH + PYTHIAand SHERPA, and to next-to-leading-order calculations from BLACKHAT + SHERPA. The differential cross sections are found to be in agreement with the predictions, apart from the pT distributions of the leading jets at high pT values, the distributions of the HT at high-HT and low jet multiplicity, and the distribution of the difference in azimuthal angle between the leading jet and the muon at low values.
Measurement of the Associated Z Boson and B-jet Production in Proton-proton Collisions at $sqrts}$
Author: Natalie HeracleousA Measurement of the Underlying Event Distributions in Proton-Proton Collisions at Sqrt(s)
Author: Joseph Salvatore VirziPublisher:
ISBN:
Category :
Languages : en
Pages : 184
Book Description
Underlying Event distributions are studied in events containing at least one charged particle jet produced in proton-proton collisions at sqrt(s) = 7 TeV. Jets are reconstructed from charged particles using the anti-Kt algorithm with radius parameter R = 0.6. The jet with the largest transverse momentum (pT) and.
Measurement of the Production Cross Section of Jets in Association with a Z Boson in 8 TeV Proton-proton Collisions with the ATLAS Detector
Author: Rodger MantifelPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
"This thesis presents the measurement of the production cross sections of jets in association with a Z boson in proton-proton collisions at √s = 8 TeV with an integrated luminosity of 20.3 fb−1 recorded by the ATLAS experiment at the Large Hadron Collider at CERN. Inclusive and differential Z/[gamma]∗(→ e+e−)+jets cross sections are measured for jets with a transversemomentum pT(jet) > 30 GeV and rapidity |y(jet)| 4.4. Z boson candidates are identified by their decay into electron pairs. In order to stringently probe the modelling of Z/[gamma]∗+jets production by Monte Carlo generators in regions of high-pT phase space typical for Higgs boson decay and searches for new physics, events with high-pT final states are investigated. High-pT final states are defined as events with either pT(Z) 300 GeV or pT(leading jet) > 300 GeV. A set of four observables, sensitive to the topology of the event, are measured for the standard event selection as well as in the regions of high-pT phase space. The results from data are unfolded to particle level and compared to calculations of the matrix element from Monte Carlo generators Alpgen+Pythia and Sherpa interfaced to a parton shower. The results show that Sherpa tends to model Z/[gamma]∗+jets production in high-pT regions of phase space much better than Alpgen+Pythia." --
Measurement of Charged Hadron Production in $Z$-tagged Jets in Proton-proton Collisions at $\sqrts}
Author: Roel AaijMeasurement of the Pair Production of B-jets in Proton-proton Collisions at Root Out S
Author: Andrea NeusiedlInclusive Jet and Dijet Production in Polarized Proton-proton Collisions at [the Square Root of Sigma]
![Inclusive Jet and Dijet Production in Polarized Proton-proton Collisions at [the Square Root of Sigma] PDF](https://books.google.com/books/content/images/frontcover/HZS8ZwEACAAJ?fife=w80-h100)
Author: Tai SakumaPublisher:
ISBN:
Category :
Languages : en
Pages : 220
Book Description
The inclusive jet cross section, the dijet cross section, and the dijet longitudinal double spin asymmetry ALL in polarized proton-proton collisions at [square root of sigma] = 200 GeV are measured with a data sample of 5.4 pbm collected with the STAR detector during RHIC Run-6. The inclusive cross section is measured as a function of jet transverse momentum PT in the range of 10