Download or read book Measurements of the WZ Di boson Production Cross Section at center of Mass Energy written by Rahmi Ünalan and published by . This book was released on 2009 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The First Measurement of the Differential Cross section of Electroweak W plus minus W plus minus jj Production at 13 TeV with the ATLAS Detector written by Shalu Solomon and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Vector boson scattering is one of the recent remarkable observations at the Large Hadron Collider. The longitudinal polarization modes of the massive vector bosons are strongly tied to the electroweak symmetry breaking mechanism. With the Standard Model predicted Higgs boson playing a crucial role in regularizing the scattering amplitude of these longitudinally polarized bosons, vector boson scattering is a pivotal process in experimentally probing the symmetry breaking mechanism. A golden channel for measuring vector boson scattering at the collider is the electroweak production of two $W$ bosons with the same electric charges. Owing to its largest quark- to gluon- induced production ratio among other di-boson combinations, the process was also the first target of the ATLAS vector boson scattering program, with evidence made in 2014 and observation in 2019. This thesis presents the first measurement of the differential cross-section with the ATLAS experiment at $\sqrt{s}=13$\,TeV using 139\,fb$^{-1}$ datasets of proton-proton collisions. The process is studied in the leptonic decay channels of the $W$ bosons, effectively suppressing many Standard Model backgrounds. The process $pp \rightarrow l^{\pm} \nu l^{\pm} \nu jj $ is measured with the final state consisting of two leptons of like charges, two jets, and missing transverse energy. The characteristic vector boson scattering signature of two tagging jets, with a large di-jet invariant mass, separated by large angles, is used to tag electroweak-induced production. A combination of Monte Carlo-based predictions and data-driven approaches is used to estimate the various backgrounds. A statistical model of profile likelihood is used to constrain the background predictions and reduce the uncertainties following which the events are unfolded, and the cross-section is extracted. The fiducial differential cross-sections are measured in the leptonic channel as a function of several kinematic variables and are found to be consistent with the Standard Model predictions within uncertainties. An experimental precision of 10.2\% is achieved for the fiducial cross-section, and the measurement is unprecedented in precision and granularity for the process. The integrated fiducial cross-section is $3.51 \pm 0.27\,\text{(stat)}\,\pm 0.23\,\text{(syst)}\,\text{fb}$ and agrees with the leading order prediction of $2.97^{+0.28}_{-0.24}\,\text{fb} $ simulated by MadGraph+Herwig7 within uncertainties
Download or read book Atomic Calculation of Photoionization Cross sections and Asymmetry Parameters written by J.-J. Yeh and published by Gordon & Breach Science Pub. This book was released on 1993-01-01 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the results of atomic calculations of subshell and total photoionization cross-sections and asymmetry parameters as a function of photon energies below 1.5 KeV. The book provides graphical data for the dipole-length approximation and includes ASCII text data on floppy diskettes for all approximations calculated in the same model. The data files may be exported to IBM PC/XT and AT or compatible computers or printers. Installation requires 6Mb of temporary memory. j.J. Yeh, AT&T Bell Laboratories, Murray Hill, New Jersey, USA
Download or read book Four Fermion Low multiplicity Final States Cross section Measurement in Ee Collisions at square Root S written by Phu Thien Tran and published by . This book was released on 2004 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Updated Excitation and Ionization Cross Sections for Electron Impact on Atomic Oxygen written by Russ R. Laher and published by . This book was released on 1988 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
