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1

Symonds, Philip. "Top pair production cross sections and differential cross sections in the semi-leptonic channel using the CMS detector at √s = 7 and 8 TeV." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/10917.

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The top quark has been extensively studied since the Large Hadron Collider (LHC) began operating in 2010. The excellent performance of both the LHC and the Compact Muon Solenoid (CMS) detector has enabled complex analyses of many properties of the top quark. In this thesis inclusive and differential top pair (tt) production cross sections have been measured. Inclusive tt cross sections of 145.6 ± 8.2 (stat.) +38.1/28.3 (syst.) pb and 237.4 ± 1.9 (stat.) +20.4/-16.9 (syst.) pb were measured at 7 TeV and 8 TeV center-of-mass collision energies using luminosities of 1 fb⁻¹ and 19.7 fb⁻¹, respecti
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2

Leask, Peter John. "Probing nuclear molecular analogue states in carbon, boron and beryllium isotopes." Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369340.

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3

Signal, Anthony Ian. "Deep inelastic scattering and bag model." Title page, abstract and contents only, 1988. http://web4.library.adelaide.edu.au/theses/09PH/09phs578.pdf.

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4

Bansil, Hardeep Singh. "Diffractive dijet production in √s = 7 TeV pp collisions at the ATLAS Experiment." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/4814/.

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A data sample of pp collisions with an integrated luminosity of 6.75 nb\(^{-1}\) was collected using a combination of a minimum bias trigger and a single jet trigger at √s = 7 TeV using the ATLAS detector at the Large Hadron Collider. It is analysed to study diffractive dijet production, i.e. events with a hadronic system containing at least two jets in addition to a large region of pseudorapidity devoid of hadronic activity. The cross section is presented differentially with respect to Δη\(^F\), the largest continuous region of pseudorapidity which extends from the edge of the detector at η =
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5

Khudeir, Imad. "Scattering of polarized lithium-7 form nuclei at energies near the Coulomb barrier." Thesis, University of Strathclyde, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292177.

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6

Lee, Graham Richard. "Resonance production in the π⁺ π⁻ decay channel in proton-proton collisions at 7 TeV". Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6802/.

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Short lived resonances can be used as a useful probe into the fundamental interactions that occur within the collisions of particles at high energy, as conducted in high energy experiments, such as the ones performed at the A Large Ion Collider Experiment (ALICE) experiment at the Large Hadron Collider (LHC). The environments studied range from the broad hadronic interactions created within the collisions of protons at unexplored centre-of-mass energies, to an entirely different form of hadronic matter created in the hot and dense region resulting from colliding heavy ions at high energy. Howe
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7

Chavda, Vikash. "Measurement of the mass difference between top and anti-top quarksin top pair events from pp collisions at √s = 7 TeV." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/measurement-of-the-mass-difference-between-top-and-antitop-quarksin-top-pair-events-from-boldmathpp-collisions-at-boldmathsqrts--7tev(51cb834b-7dbb-4acd-b173-da025603dfc2).html.

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A measurement of the mass difference between top and anti-top quarks produced in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector at the LHC is presented. The analysis uses the full 2011 data sample, corresponding to an integrated luminosity of 4.7 fb$^{-1}$. An event-by-event mass difference is calculated for every event consistentwith $\ttbar$ production and decay in the semi-leptonic channel.A likelihood fit to the full double $b$-tagged data set yields a measured valueof $\Delta(m) = m_{t}-m_{\bar{t}} = 0.67 \pm{0.61}~(\mathrm{stat.}) \pm{0.19}~(\mathrm{syst.})~\mathrm{GeV}$, co
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8

Tsionou, Dimitra. "Measurement of the differential production cross section of W bosons and charge asymmetry at √s = 7 TeV with the ATLAS detector." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/3844/.

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This document presents a measurement of the production cross section of W bosons and of its charge asymmetry in proton-proton collisions at a centre of mass energy of 7 TeV with the ATLAS detector. These measurements provide information on the momentum fraction of the protons carried by the partons contributing to the W production and therefore allow to better understand the parton distribution functions of the proton. The W candidate events are selected in the W→eν decay mode. The LAr electromagnetic calorimeter plays an important role in the detection of electrons and the author has worked o
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9

Petrov, Plamen Rumenov. "Strangeness enhancement in high multiplicity proton-proton collisions at √s = 7 TeV with the ALICE detector at the LHC." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4139/.

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ALICE is one of the seven experiments at the Large Hadron Collider (LHC) at CERN, dedicated to the physics of heavy-ion collisions and, in particular, the properties of the Quark Gluon Plasma (QGP). IN addition to studying Pb-Pb collisions at \(\sqrt{sNN}\) = 2.76 TeV, ALICE has an extensive proton-proton (p-p) programme (\(\sqrt{s}\) = 0.9, 2.76, 7 and 8 TeV) aimed to provide a base for comparison with the Pb-Pb data as well as to complement the research in areas where ALICE is competitive with the other LHC experiments. Of particular interest for the ALICE collaboration are the high-multipli
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10

Xu, Da. "Reconstruction and applications of QED final state radiation photons in Z->mumu decays produced in 7 TeV proton-proton collisions at the Large Hadron Collider." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/2265/.

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This thesis presents a method for including the final state radiation (FSR) photon in the reconstruction of Z bosons decaying into pairs of muons (Z ->mumu). An algorithm for the reconstruction of FSR photons has been developed. The FSR photon candidates with ET >1.3 GeV are reconstructed within dR < 0.15 cone about the axis defined by the muon momentum direction at the interaction point, using the liquid argon calorimeter of ATLAS and a special clustering efficient at low energies. Based on an integrated luminosity of 164 pb-ˆ'1 , the cross section of the Z->mumu events with at least one FSR
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11

Lewis, Adrian. "Measurement of the inclusive W+/- cross section at √s = 7 TeV with the ATLAS detector." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:181c28c2-121a-46f6-baac-c45209f7cc4a.

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A measurement of the W+ and W− cross section in the electron channel is presented. The measurement is performed using data collected with the ATLAS experiment in 2011, amounting to an integrated luminosity of 4.58 fb<sup>−1</sup>. The centre of mass energy is √s = 7 TeV. The measurement is performed differentially in the electron pseudorapidity. The W charge asymmetry is also presented. The results are compared to theoretical predictions calculated at next-to-next-to-leading order in perturbative QCD using various Parton Distribution Functions.
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12

Poll, Andrew James. "Measurement of the top-quark pair production cross section with soft muon b-tagging in pp collisions at √s = 7 TeV with the Atlas detector." Thesis, Queen Mary, University of London, 2011. http://qmro.qmul.ac.uk/xmlui/handle/123456789/2446.

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This thesis presents a study of the measurement of the top pair production cross section in the semileptonic decay channel with soft muon b-tagging at the Atlas detector using early LHC data. A theoretical overview of current research in particle physics, motivating the construction of the LHC and the Atlas detector is discussed followed by the main motivations behind a measurement of the top cross section. A summary of my work undertaken for the semiconductor tracker (SCT) collaboration on Atlas, including shift work and the refurbishment of the SR1 barrel sector and spare endcap disk is deta
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13

Martyniuk, Alex. "A search for a light charged Higgs Boson decaying to cs at √s = 7 TeV." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/a-search-for-a-light-charged-higgs-boson-decaying-to-cs-at-s--7-tev(13c8812a-4dec-4e7e-811b-34137395038d).html.

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A search for a light charged Higgs boson decaying into cs is presented using data recorded in pp collisions at √s = 7 TeV. The analysis uses a data sample corresponding to an integrated luminosity of 35.3 pb⁻¹ collected by the ATLAS detector at the LHC between June and November 2010. The search is based on the semi-leptonic tt channel searching for the process t → H⁺b where H⁺ → cs⁻. The invariant mass distribution of the dijet system consistent with the hadronic decay of a W⁺ is used to search for a secondary bump from hadronic H⁺ decays. With no observation of the charged Higgs signal, 95% c
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14

Palaha, A. S. "Multiplicity and mean transverse momentum of proton-proton collisions at √s = 900 GeV, 2.76 and 7 TeV with ALICE at the LHC." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4490/.

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The charged particle multiplicity is measured for inelastic and non-single-diffractive proton-proton collisions at collision energies of 900 GeV, 2760 GeV and 7000 GeV. The data analysed corresponds to an integrated luminosity of 0.152 \(\pm\) 0.003 pb\(^{-1}\), 1.29 \(\pm\) 0.07 pb\(^{-1}\) and 2.02 \(\pm\) 0.12 pb\(^{-1}\) for each respective collision energy. The average transverse momentum per event as a function of charged multiplicity, for tracks with transverse momentum above 150 MeV/c and 500 MeV/c, is measured for inelastic proton-proton collisions. Two methods of deconvolution were s
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15

Howarth, James William. "Observation of spin correlations in tt̄ events at √s = 7 TeV using the ATLAS detector." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/observation-of-spin-correlations-in-ttbar-events-at-boldmathsqrts--7tev-using-the-atlas-detector(61844fe2-16c0-486e-9ceb-9e72425b7b20).html.

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This thesis presents measurements of the the spin correlation strength in top anti-top quark pair production at the LHC using the ATLAS detector. The data used corresponds to 4.6 fb−1 of integrated luminosity taken during 2011 at the LHC at a center of mass energy of 7 TeV. The spin correlation is studied utilising different observables with different sensitivities to the production mechanism, in particular to gluon-gluon fusion in the like or unlike helicity state, quark anti- quark annihilation in the unlike helicity state, or a combination of the three. In addition cuts are made on the inva
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16

Piccaro, Elisa. "Measurement of the low mass Drell-Yan cross section in the di-muon channel in proton-proton collisions at √s = 7 TeV with the ATLAS detector." Thesis, Queen Mary, University of London, 2012. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8619.

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The low mass Drell-Yan di-muon process is investigated with the ATLAS detector at the LHC, in order to provide information that advances our knowledge of the Parton Density Functions in a region of phase space unaccessible at previous experiments. A cut-based selection of di-muon events is performed, using 2010 data with a centre of mass energy of the proton-proton collisions of 7TeV, and an integrated luminosity of 36 pb−1. The analysis probes the region of low muon transverse momentum (pT > 6GeV), and low di-muon mass region 12 < M < 66GeV. The main challenges of the analysis are the underst
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17

Shawcross, Mark. "Breakup reactions populating cluster states in 28Si and 24Mg." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/843397/.

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The 12C+16O breakup of 28Si and the 12C+12C breakup of 24Mg have been studied following the interaction of a 170 MeV 24Mg beam with 7Li, 9Be,12C and 16O target nuclei. The measurements were performed at the Australian National University in Canberra, using the technique of Resonant Particle Spectroscopy. The breakup fragments from the decay of the resonant nuclei were detected in two Gas-Si-CsI telescopes positioned on opposite sides of the beam axis. The data suggest that the same states in 28Si are populated via the 7Li(24Mg, 12C 16O)3H, 9Be(24Mg,12C 16O)5He and 12c(24Mg,12C 16O)8Be reaction
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18

Martin, William Patrick. "Measurement of the single top tW associated production cross section at 7 TeV with 4.9 fb-1 of data in the dilepton decay channel at the LHC using the CMS detector." Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/7618.

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The first measurement of the production cross section for a single top quark in association with a W boson with the CMS experiment at the Large Hadron Collider is presented. The analysed data is from proton-proton collisions at a centre-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 4.9 fb-1. The analysis focuses on the leptonic final states of the process and implements a cut-based method. The final state consists of two leptons, two neutrinos and a jet from the fragmentation of a b-quark. The primary source of background events arises from tt(overbar) production, follo
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19

Teixeira, Dias Castanheira Matilde. "Measurement of the single top t-channel cross section using a cut based analysis with the ATLAS detector in pp collisions at √s = 7 TeV." Thesis, Queen Mary, University of London, 2013. http://qmro.qmul.ac.uk/xmlui/handle/123456789/9083.

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This thesis presents studies of the single top t-channel in the electron plus jets mode. In order to understand this channel, an account of the present theoretical models is given. This work relies on collisions data from the ATLAS detector and its components are presented here. A summary of the work involving the SCT, part of the tracking system in ATLAS, is also explained here. Studies were performed to optimize the measurement of the Lorentz Angle of the holes in the Silicon for the initial data taking period. The data studied was acquired by ATLAS during 2011, with a total integrated lumin
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20

Goddard, Jack Robert. "A measurement of the low mass Drell-Yan differential cross section in the di-muon channel with √s = 7 TeV proton-proton collisions at the ATLAS experiment." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8147.

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A measurement of the Drell-Yan differential cross section at low invariant mass is presented in the di-muon channel. A 1.64 pb−1 dataset of √s = 7 TeV proton-proton collision data collected by the ATLAS experiment at the LHC is used. The measurement is made in an invariant mass range of 26 < M < 66 GeV where M is the invariant mass of the muon pair. A review of the relevant theoretical physics and the ATLAS detector is made. The analysis is described with particular attention paid to the determination of the isolation efficiency corrections for the Monte Carlo and the estimate of the multijet
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21

Signal, Anthony Ian. "Deep inelastic scattering and the bag model." Thesis, 1988. http://hdl.handle.net/2440/18713.

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Typescript<br>Copies of three papers (2 published), co-authored by the author, in back<br>Bibliography: leaves 179-186<br>ix, 186 leaves : ill ; 30 cm.<br>Thesis (Ph.D.) -- University of Adelaide, Dept. of Physics and Mathematical Physics, 1988
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