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Measurement Of Z Boson Production In Pb Pb And P P Collisions Via The Electron And Muon Decay Channels At Squarerootsnn
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Book Synopsis Measurement of Z-boson Production in Pb+Pb and P+p Collisions Via the Electron and Muon Decay Channels at [squareroot]s(NN) by : Michael David Gardner
Download or read book Measurement of Z-boson Production in Pb+Pb and P+p Collisions Via the Electron and Muon Decay Channels at [squareroot]s(NN) written by Michael David Gardner and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments over the last decade at the Relativistic Heavy Ion Collider (RHIC) at the Brookhaven National Laboratory have yielded evidence for the formation of the new state of matter called the quark-gluon plasma (QGP). Normally, quarks (and their associated gluons) are found only in colorless doublets (mesons) or triplets (baryons), but when raised above the cross-over threshold at a temperature of ∼ 175 MeV, a strongly-coupled partonic medium of asymptotically free quarks and gluons is expected to form. The focus of heavy-ion physics at both the RHIC and Large Hadron Collider (LHC) experiments has been to study physical processes that allow for a better grasp of the properties of this medium. Because of the large center-of-mass energy per nucleon pair ([squareroot]s(NN)) of 2.76 TeV in Pb+Pb collisions at the LHC and substantial delivered integrated luminosities, the study of new processes in nucleus-nucleus collisions has become possible. One of those processes is Z-boson production, which due to it not interacting strongly, being produced in hard collisions and having a decay channel that does not interact with the QGP, can act as a control in understanding the cold nuclear matter effects present in heavy-ion collisions. This dissertation presents the measurement of the production of Z bosons in the dimuon and dielectron decay channels in Pb+Pb and p+p collisions at [squareroot]s(NN) of 2.76 TeV obtained by the CMS experiment at the LHC. The analysis is based on the data sample collected during the Pb+Pb run in 2011, which corresponds to an integrated luminosity of 150 [mu]b−1 and on the p+p data sample collected in 2013, at the same center-of-mass energy, with an integrated luminosity of 5.4 pb−1. The ratio of Pb+Pb to p+p yields, scaled by the number of incoherent nucleon-nucleon collisions, R(AA), is expected to be equal to unity if there are no nuclear effects modifying the production of the Z boson in the Pb+Pb collisions. The R(AA) for centrality-integrated Z-boson production is found to be 1.06 ± 0.05 (stat) ± 0.08 (syst) in the dimuon channel and 1.02 ± 0.08 (stat) ± 0.15 (syst) in the dielectron channel, and shows no nuclear modification across the rapidity, transverse momentum and centrality bins measured. This result demonstrates that the binary-collision scaling is seen to hold in the kinematic region studied, which is expected for a colorless probe that is unaffected by a deconfined QGP. It also opens avenues to study processes that are strongly modified by the QGP, by using Z production as a control.
Book Synopsis Study of Z Boson Production in PPb Collisions at {u221A}sNN by :
Download or read book Study of Z Boson Production in PPb Collisions at {u221A}sNN written by and published by . This book was released on 2016 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The production of Z bosons in pPb collisions at √sNN = 5.02TeV is studied by the CMS experiment via the electron and muon decay channels. The inclusive cross section is compared to pp collision predictions, and found to scale with the number of elementary nucleon-nucleon collisions. The differential cross sections as a function of the Z boson rapidity and transverse momentum are measured. Though they are found to be consistent within uncertainty with theoretical predictions both with and without nuclear effects, the forward-backward asymmetry suggests the presence of nuclear effects at large rapidities. These results provide new data for constraining nuclear parton distribution functions.
Book Synopsis Z Boson Production in P + Pb Collisions at \(\sqrt{s_{\mathrm{NN}}} by :
Download or read book Z Boson Production in P + Pb Collisions at \(\sqrt{s_{\mathrm{NN}}} written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: With this research, the ATLAS Collaboration measures the inclusive production of Z bosons via their decays into electron and muon pairs in p + Pb collisions at \(\sqrt{s_{\mathrm{NN}}} = 5.02\) TeV at the Large Hadron Collider. The measurements are made using data corresponding to integrated luminosities of 29.4 and 28.1 nb-1 for Z → ee and Z → [mu][mu], respectively. The results from the two channels are consistent and combined to obtain a cross section times the Z → ll branching ratio, integrated over the rapidity region
Book Synopsis Study of Z Production in PbPb and Pp Collisions at [arrow]"NN by :
Download or read book Study of Z Production in PbPb and Pp Collisions at [arrow]"NN written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The production of Z bosons is studied in the dimuon and dielectron decay channels in PbPb and pp collisions at [arrow]"NN = 2.76 TeV, using data collected by the CMS experiment at the LHC. The PbPb data sample corresponds to an integrated luminosity of about 166 [mu]b-1, while the pp data sample collected in 2013 at the same nucleon-nucleon centre-of-mass energy has an integrated luminosity of 5.4 pb-1. The Z boson yield is measured as a function of rapidity, transverse momentum, and collision centrality. The ratio of PbPb to pp yields, scaled by the number of inelastic nucleon-nucleon collisions, is found to be 1.06 " 0.05 (stat) " 0.08 (syst) in the dimuon channel and 1.02 " 0.08 (stat) " 0.15 (syst) in the dielectron channel, for centrality-integrated Z boson production. This binary collision scaling is seen to hold in the entire kinematic region studied, as expected for a colourless probe that is unaffected by the hot and dense QCD medium produced in heavy ion collisions.
Book Synopsis Study of Z Boson Production in PbPb Collisions at Nucleon-nucleon Centre of Mass Energy by :
Download or read book Study of Z Boson Production in PbPb Collisions at Nucleon-nucleon Centre of Mass Energy written by and published by . This book was released on 2011 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for Z bosons in the mu+̂mu-̂ decay channel has been performed in PbPb collisions at a nucleon-nucleon centre of mass energy = 2.76 TeV with the CMS detector at the LHC, in a 7.2 inverse microbarn data sample. The number of opposite-sign muon pairs observed in the 60--120 GeV/c2̂ invariant mass range is 39, corresponding to a yield per unit of rapidity (y) and per minimum bias event of (33.8 +/- 5.5 (stat) +/- 4.4 (syst)) 10{̂-8}, in the.
Book Synopsis Measurement of W Boson Production in Pp Collisions at 5.02 TeV and Optimisation of Electron Identification in Pb+Pb Collisions with the ATLAS Detector by : Jakub Kremer (fizyka)
Download or read book Measurement of W Boson Production in Pp Collisions at 5.02 TeV and Optimisation of Electron Identification in Pb+Pb Collisions with the ATLAS Detector written by Jakub Kremer (fizyka) and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Measurement of Z Boson Production and Rapidity Distribution in Proton-Antiproton Collisions at {u221A}s by :
Download or read book A Measurement of Z Boson Production and Rapidity Distribution in Proton-Antiproton Collisions at {u221A}s written by and published by . This book was released on 2004 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-precision measurements are made of Z boson production in proton-antiproton collisions at √s = 1.96 TeV recorded by the Collider Detector at Fermilab, using the electron decay channel. The cross-section times branching ratio is measured to be ?Z · Br(Z → e+e-) = (255.7 ± 2.4stat ± 5.2sys ± 15.2lum)pb in a dataset of 194 pb-1 collected between March 2002 and June 2003. This agrees well with theoretical predictions. The cross-section for W boson production in the electron channel has also been measured in the subset of this dataset of 72 pb-1 collected up until January 2003. Using this smaller dataset the ratio of cross-sections is determined to be R ≡ ?W · Br(W → e?)/?Z · Br(Z → ee) = 10.82 ± 0.18stat ± 0.16sys. Combining these results with measurements made in the muon channel gives R = 10.92 ± 0.15stat ± 0.14sys (e + ? channels), from which the branching ratio of the W to electrons and muons, and the total width of the W, have been extracted: Br(W → l?) = 0.1089 ± 0.0022 (l = e,?); ?(W) = 2078.8 ± 41.4 MeV, which are in good agreement with the Standard Model values and with other measurements. The CKM quark mixing matrix element.
Book Synopsis Diffractively Produced Z Bosons in the Muon Decay Channel in P-pbar Collisions at S**(1/2) by : Tamsin L. Edwards
Download or read book Diffractively Produced Z Bosons in the Muon Decay Channel in P-pbar Collisions at S**(1/2) written by Tamsin L. Edwards and published by . This book was released on 2006 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first analysis of diffractively produced Z bosons in the muon decay channel is presented, using data taken by the D0 detector at the Tevatron at {radical}s = 1.96 TeV. The data sample corresponds to an integrated luminosity of 109 pb{sup -1}. The diffractive sample is defined using the fractional momentum loss {zeta} of the intact proton or antiproton measured using the calorimeter and muon detector systems. In a sample of 10791 (Z/{gamma})* {yields} {mu}{sup +}{mu}{sup -} events, 24 diffractive candidate events are found with {zeta}
Book Synopsis Measurement of the W±Z Boson Pair-production Cross Section in Pp Collisions at by :
Download or read book Measurement of the W±Z Boson Pair-production Cross Section in Pp Collisions at written by and published by . This book was released on 2016 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, the production of W±Z events in proton–proton collisions at a centre-of-mass energy of 13 TeV13 TeV is measured with the ATLAS detector at the LHC. The collected data correspond to an integrated luminosity of 3.2 fb–1. The W±Z candidates are reconstructed using leptonic decays of the gauge bosons into electrons or muons.
Book Synopsis Measurement of the W±Z Boson Pair-production Cross Section in Pp Collisions at [mml by :
Download or read book Measurement of the W±Z Boson Pair-production Cross Section in Pp Collisions at [mml written by and published by . This book was released on 2016 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, the production of W±Z events in proton-proton collisions at a centre-of-mass energy of 13 TeV13 TeV is measured with the ATLAS detector at the LHC. The collected data correspond to an integrated luminosity of 3.2 fb-1. The W±Z candidates are reconstructed using leptonic decays of the gauge bosons into electrons or muons.
Book Synopsis Measurement of the Angular Coefficients in Z-boson Events Using Electron and Muon Pairs from Data Taken at $ \sqrt{s} by :
Download or read book Measurement of the Angular Coefficients in Z-boson Events Using Electron and Muon Pairs from Data Taken at $ \sqrt{s} written by and published by . This book was released on 2016 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: The angular distributions of Drell-Yan charged lepton pairs in the vicinity of the Z-boson mass peak probe the underlying QCD dynamics of Z-boson production. This paper presents a measurement of the complete set of angular coefficients A0-7 describing these distributions in the Z-boson Collins-Soper frame. The data analysed correspond to 20.3 fb-1 of pp collisions at √s = 8 TeV, collected by the ATLAS detector at the CERN LHC. The measurements are compared to the most precise fixed-order calculations currently available (O([alpha]2s)) and with theoretical predictions embedded in Monte Carlo generators. The measurements are precise enough to probe QCD corrections beyond the formal accuracy of these calculations and to provide discrimination between different parton-shower models. A significant deviation from the (O([alpha]2s)) predictions is observed for A0 - A2. In conclusion, evidence is found for non-zero A5,6,7, consistent with expectations.
Book Synopsis Generator-level Acceptance for the Measurement of the Inclusive Cross Section of W-boson and Z-boson Production in Pp Collisions at [square Root Of] S by : Alexander Andriatis
Download or read book Generator-level Acceptance for the Measurement of the Inclusive Cross Section of W-boson and Z-boson Production in Pp Collisions at [square Root Of] S written by Alexander Andriatis and published by . This book was released on 2018 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The inclusive cross section of vector boson production in proton-proton collisions is one of the key measurements for constraining the Standard Model and an important part of the physics program at the LHC. Measurement of the inclusive cross section requires calculating the detector acceptance of decay products. The acceptance of the CMS detector of leptonic decays of W and Z bosons produced in pp colisions at [square root of]s = 5 TeV is calculated using Monte Carlo event simulation. Statistical and systematic uncertainties on the acceptance measurement from PDF and a, uncertainty and higher-order correction are reported. The use of the calculated acceptance in combination with measurements of detector efficiency, luminosity, and particle counting to determine the inclusive cross section is outlined. A total integrated luminosity of 331.64 pb-1 from 2015 and 2017 CMS data at [square root of]s = 5 TeV is available for the calculation of the inclusive cross section.
Book Synopsis Measurements of Z? and Z?? Production in Pp Collisions at S by :
Download or read book Measurements of Z? and Z?? Production in Pp Collisions at S written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The production of Z bosons with one or two isolated high-energy photons is studied using pp collisions at √s=8 TeV. The analyses use a data sample with an integrated luminosity of 20.3 fb-1 collected by the ATLAS detector during the 2012 LHC data taking. The Z? and Z?? production cross sections are measured with leptonic (e+e-, ?+?-, ?????????) decays of the Z boson, in extended fiducial regions defined in terms of the lepton and photon acceptance. They are then compared to cross-section predictions from the Standard Model, where the sources of the photons are radiation off initial-state quarks and radiative Z-boson decay to charged leptons, and from fragmentation of final-state quarks and gluons into photons. The yields of events with photon transverse energy ET > 250 GeV from l+l-? events and with ET > 400 GeV from ?????????? events are used to search for anomalous triple gauge-boson couplings ZZ? and Z??. The yields of events with diphoton invariant mass m?? > 200 GeV from l+l-?? events and with m?? > 300 GeV from ??????????? events are used to search for anomalous quartic gauge-boson couplings ZZ?? and Z???. As a result, no deviations from Standard Model predictions are observed and limits are placed on parameters used to describe anomalous triple and quartic gauge-boson couplings.
Book Synopsis Measurement of W and Z Boson Production and Extraction of the W Width and Branching Ratios at CDF by :
Download or read book Measurement of W and Z Boson Production and Extraction of the W Width and Branching Ratios at CDF written by and published by . This book was released on 1994 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present results from W and Z boson production in proton-antiproton collisions at √s = 1.8 TeV using the CDF detector. We measure the W and Z cross sections times lepton branching ratio, [sigma](p{bar p} → W)·B(W → l[nu]{sub l}) and [sigma](p {bar p} → Z)· B(Z → k+l−) l = e, [mu]. We also measure the ratio: R{sub l} = [sigma] · B(W → l[nu]{sub l})/[sigma] · B(Z → ll). From R{sub l}, we extract the W electron and muon branching ratios, BR(W → l[nu]{sub l}, and the total W width, [Gamma]{sub W}. In addition, high transverse mass W →e[nu]{sub e}, candidates provide an alternate, direct measurement of [Gamma]{sub W}.
Book Synopsis Measurement of the Mass and Width of the Z Boson from Z Going to Positron-electron Decay in Antiproton-proton Collisions at Sqrt.s by : Hovhannes Keutelian
Download or read book Measurement of the Mass and Width of the Z Boson from Z Going to Positron-electron Decay in Antiproton-proton Collisions at Sqrt.s written by Hovhannes Keutelian and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: I report the results of an analysis to measure the mass and width of the Z gauge boson from Z $to$ e$sp{+}$e$sp{-}$ decays in pp collisions at $sqrt{s}$ = 1.8 TeV. The Z $to$ e$sp{+}$e$sp{-}$ data from the CDF detector yields a mass of the Z boson of M$sb{rm Z}$ = 90.78 $pm$ 0.40(stat.) $pm$ 0.38(syst.) $pm$ 0.2(scale) GeV/c$sp2$ and a width of $Gammasb{rm Z}$ = 2.8 $pm$ 1.0(stat.) $pm$ 0.5(syst.) GeV.
Book Synopsis Precision Measurements of W and Z Boson Production and Their Decays to Electrons at Hadron Colliders by :
Download or read book Precision Measurements of W and Z Boson Production and Their Decays to Electrons at Hadron Colliders written by and published by . This book was released on 2006 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: For many measurements at hadron colliders, such as cross sections and branching ratios, the uncertainty of the integrated luminosity is an important contribution to the error of the final result. In 1997, the ETH Zurich group proposed a new approach to determine the integrated luminosity via a counting measurement of the W and Z bosons through their decays to leptons. In this thesis this proposal has been applied on real data as well as on simulation for a future experiment.
Book Synopsis Measurement of ?(p$\bar{p}${u2192}Z) Br(Z{u2192}?+?-) and Search for Higgs Bosons Decaying to ?+?- at {u221A}s by :
Download or read book Measurement of ?(p$\bar{p}${u2192}Z) Br(Z{u2192}?+?-) and Search for Higgs Bosons Decaying to ?+?- at {u221A}s written by and published by . This book was released on 2008 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: The resonant production of tau-lepton pairs is as interesting for the study of Standard Model (SM) physics as the production of lighter leptons pairs. For new phenomena, such as Higgs boson production or in case new particles beyond the SM would arise, the detection of (resonant) pairs of tau leptons becomes much more interesting. This is due to the fact that tau leptons are much heavier than the other leptons, which increases the chance that these new phenomena would be observed first in this channel. Unfortunately their clean detection is far more difficult than that of muons or electrons. The cross section times branching ratio ?. Br for the process p$ar{p}$ → Z → ?+?- was measured at √s = 1.96 GeV using 1.0 fb-1 of data collected by the D0 experiment. This measurement was performed in the channel in which one of the tau leptons decays to a muon and neutrinos, while the other decays either hadronically or to an electron and neutrinos. A set of 1511 events, of which about 20% estimated background, passed all selection criteria. The trigger and muon reconstruction efficiencies, as well as the efficiency for track reconstruction were obtained from data using the 'tag and probe' method on Z → ?+?- events. The multijet background was estimated from the sample of events which passed all selection criteria but in which the muon and the tau candidate had the same charge. The W → ?v + jets background was modeled by Monte Carlo simulations, but normalized to data. All the other backgrounds, as well as the efficiency for Z → ?+?- events were estimated using simulated events normalized to the theoretical calculations of cross sections at next-to-leading order or next-to-next-to-leading order. The energy of the tau candidates was corrected for the estimated response of the charged pions in the calorimeter, which is of the order 50-80%. Since the charged pion response in data was not well reproduced by the default simulation of hadronic interactions (Geisha), a different simulation (gCALOR) was used to obtain an estimated charged pion response consistent with the one measured in data. This tau energy correction method makes use of the superior resolution of the track momentum measurement compared to the resolution of the tau candidate energy as measured by the calorimeter, which leads to a better data--simulation agreement and a decrease of 10% in the resolution of the visible mass peak. The result of this measurement is ?(p$ar{p}$ → Z) • Br(Z → ?+?-) = 240 ± 8(stat) ± 12(syst) ± 15(lumi) pb, in good agreement with the theoretical predictions of 241.6$+3.6top{3.2}$ pb [79] or 251.9$+5.1top{-12}$ pb [93-95], as well as with other measurements performed by the D0 and CDF experiments in all channels in which the Z boson decays leptonically [96-100]. This is the most precise Z boson cross section measurement to date performed in the tau lepton channel at hadron colliders. The analysis demonstrates the ability of the D0 experiment to identify tau leptons decaying hadronically with good efficiency and high purity, a challenging task in p{bar p} collisions where the number of jets resembling tau leptons is very high. This achievement forms a solid basis for other analyses using hadronic tau lepton decays, such as the search for the Higgs boson decaying into tau-lepton pairs, which was performed for the last part of this thesis.
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