Добірка наукової літератури з теми "Zγ production"
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Статті в журналах з теми "Zγ production"
Dawson, S., Xiao-Gang He та G. Valencia. "violation in Wγ and Zγ production". Physics Letters B 390, № 1-4 (січень 1997): 431–36. http://dx.doi.org/10.1016/s0370-2693(96)01364-0.
Повний текст джерелаBU, XUEBING. "Wγ AND Zγ PRODUCTION AND LIMITS ON ANOMALOUS WWγ, ZZγ AND Zγγ COUPLINGS WITH D0 DETECTOR". International Journal of Modern Physics A 27, № 14 (27 травня 2012): 1230014. http://dx.doi.org/10.1142/s0217751x12300141.
Повний текст джерелаBelyaev, Nikita, Alexandr Petukhov та Evgeny Soldatov. "New methods of distinguishing the associated Zγ production". EPJ Web of Conferences 222 (2019): 02015. http://dx.doi.org/10.1051/epjconf/201922202015.
Повний текст джерелаGrazzini, Massimiliano, Stefan Kallweit, Dirk Rathlev та Alessandro Torre. "Zγ production at hadron colliders in NNLO QCD". Physics Letters B 731 (квітень 2014): 204–7. http://dx.doi.org/10.1016/j.physletb.2014.02.037.
Повний текст джерелаSoldatov, E. Yu. "Standard Model physics at ATLAS." EPJ Web of Conferences 222 (2019): 01002. http://dx.doi.org/10.1051/epjconf/201922201002.
Повний текст джерелаWang, Jian. "Diboson production at LHC and Tevatron." International Journal of Modern Physics A 29, no. 24 (September 29, 2014): 1430056. http://dx.doi.org/10.1142/s0217751x14300567.
Повний текст джерелаOhnemus, J., та W. J. Stirling. "Bremsstrahlung contributions to hadronic W±γ and Zγ production". Physics Letters B 298, № 1-2 (січень 1993): 230–35. http://dx.doi.org/10.1016/0370-2693(93)91735-6.
Повний текст джерелаWang, Jian. "Diboson production at LHC and Tevatron." International Journal of Modern Physics: Conference Series 31 (January 2014): 1460279. http://dx.doi.org/10.1142/s2010194514602798.
Повний текст джерелаBozzi, G., F. Campanario, M. Rauch, H. Rzehak та D. Zeppenfeld. "NLO QCD corrections to W±Zγ production with leptonic decays". Physics Letters B 696, № 4 (лютий 2011): 380–85. http://dx.doi.org/10.1016/j.physletb.2010.12.051.
Повний текст джерелаAccomando, E., A. Denner та C. Meier. "Electroweak corrections to Wγ and Zγ production at the LHC". European Physical Journal C 47, № 1 (19 квітня 2006): 125–46. http://dx.doi.org/10.1140/epjc/s2006-02521-y.
Повний текст джерелаДисертації з теми "Zγ production"
Dartsi, Olympia. "Recherche de la production électrofaible de paires Zγ et mesure de la section efficace différentielle de production de Zγ en association avec deux jets dans l'ATLAS expérience du LHC". Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY085.
Повний текст джерелаThe physics subject of my thesis work, is the measurement of the cross-section of the diboson Zgamma production in association with a high mass dijetsystem. Proton-proton collision data from the ATLAS experiment at theCERN Large Hadron Collider at a center-of-mass energy of 13 TeV,collected in 2015 and 2016 and corresponding to an integrated luminosity of36.1 fb^{-1} are analyzed. The electroweak production of Zgammajj events, provides a direct access to the nature of the electroweak symmetry breaking mechanism, by probing the quantum gauge boson couplings WWZgamma, ZZZgamma, ZZgammagamma and Zgammagammagamma. The last three are forbidden at the lowest order in the Standard Model. Any deviation from the Standard Model predictions could be a hint for new physics.Until now, the electroweak production of Zgammajj, which consist in pro-cesses with fourth-order electroweak coupling and include vector-boson scat-tering processes, has never been observed. The same Zgammajj final state canbe produced by a strongly-mediated process, with second order electroweakcoupling and second order strong coupling, resulting in a cross-section threeorder of magnitude larger than the electroweak cross-section. The Zgammajj pro-duction via electroweak and strong mechanism interfere since the initial andfinal states are the same. The understanding of this effect is an importantaspect of the analysis.In my thesis, I have studied this effect and its impact on the observationof the process and on the fiducial cross-section measurements. For this inves-tigation, after having performed the computation of the three contributions(electroweak, strong and interference) to the total cross-section using MonteCarlo simulations I have performed an optimization of the selection cuts, in order to reduce the impact of the interference, defining also a procedure onhow to account for the interference in the data analysis. The experimentalfocus of my work is the measurement of the differential cross section of theZgammajj final state as function of the invariant mass of the Zgamma system, the transverse momentum of the photon, the jet multiplicity and the invariantmass of the dijet system. Distributions sensitive to new physics are unfoldedand compared with MC expectations.All physics results rely on the reconstruction and selection of final statesconsisting of jets, electrons, muon and photons. Electrons and their identi-fication therefore play an important role in the Zgammajj analysis. This thesisreport documents also the work that I have done on the electron identification efficiency, including the implementation of an additional data drivenmethod. The results I have obtained, are used in all ATLAS analyses whosesignature contain electrons
Liu, Zong-Kai, та 劉宗凱. "Measurement of Zγ production in pp collision at √s = 7 TeV with the CMS detector at the LHC". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/65928975163868826759.
Повний текст джерела國立中央大學
物理研究所
99
The measurement of Zγ production can provide an opportunity for examining the gauge sector of the Standard Model, and evidences for the existence of new physics. This thesis presents the first cross-section measurement of Zγ → e+e-γ at √s = 7 TeV using 36 pb-1 of proton-proton collision data collected by CMS. The cross-section is measured for the photon transverse energy ETγ > 10 GeV, spatial separation from charged leptons ΔR(l, γ) > 0.7 and dilepton invariant mass Mll > 50 GeV. The σ(pp → Zγ + X) × B(Z → e+e-) is measured to be 9.5 ± 1.4 (stat.) ± 0.7 (syst.) ± 0.4 (lumi.) pb, in agreement with Standard Model prediction of 9.6 ± 0.4 pb.
Veverka, Jan. "Studies of Zγ Production and Constraints on Anomalous Triple Gauge Couplings in pp Collisions at √s = 7 TeV". Thesis, 2013. https://thesis.library.caltech.edu/7770/13/main_r413_optimized.pdf.
Повний текст джерелаIn this thesis, we test the electroweak sector of the Standard Model of particle physics through the measurements of the cross section of the simultaneous production of the neutral weak boson Z and photon γ, and the limits on the anomalous Zγγ and ZZγ triple gauge couplings h3 and h4 with the Z decaying to leptons (electrons and muons). We analyze events collected in proton-proton collisions at center of mass energy of sqrt(s) = 7 TeV corresponding to an integrated luminosity of 5.0 inverse femtobarn. The analyzed events were recorded by the Compact Muon Solenoid detector at the Large Hadron Collider in 2011.
The production cross section has been measured for hard photons with transverse momentum greater than 15 GeV that are separated from the the final state leptons in the eta-phi plane by Delta R greater than 0.7, whose sum of the transverse energy of hadrons over the transverse energy of the photon in a cone around the photon with Delta R less than 0.3 is less than 0.5, and with the invariant mass of the dilepton system greater than 50 GeV. The measured cross section value is 5.33 +/- 0.08 (stat.) +/- 0.25 (syst.) +/- 0.12 (lumi.) picobarn. This is compatible with the Standard Model prediction that includes next-to-leading-order QCD contributions: 5.45 +/- 0.27 picobarn.
The measured 95 % confidence-level upper limits on the absolute values of the anomalous couplings h3 and h4 are 0.01 and 8.8E-5 for the Zγγ interactions, and, 8.6E-3 and 8.0E-5 for the ZZγ interactions. These values are also compatible with the Standard Model where they vanish in the tree-level approximation. They extend the sensitivity of the 2012 results from the ATLAS collaboration based on 1.02 inverse femtobarn of data by a factor of 2.4 to 3.1.
Doan, Hien Thi, та 董琦涵. "Measurement of Zγ production cross section in pp collisions at sqrt(s) = 13 TeV with the CMS detector". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/bpewa4.
Повний текст джерела國立中央大學
物理學系
107
Measurement of the Z plus γ production cross section is presented using proton-proton collisions at the LHC with the CMS detector. The data were collected in 2016 corresponding to an integrated luminosity of 35.9 fb^−1 at the center-of-mass energy of 13 TeV. The events having a Z boson decaying to a pair of muons (μ+μ−) or electrons (e+e−) with Mll > 50 GeV and a high transverse momentum photon (pT ≥ 20 GeV) are selected. The fiducial cross sections are measured inclusively, exclusively and in terms of number of additional jets in the final state. Moreover, the differential cross sections in photon transverse momentum pT and three-body invariant mass Mllγ are also presented. The main background, Z+jets events in which a non-prompt photon is produced from the decay of π0 or from mis-identified particles, is estimated by template fitting with a signal template from simulation and background template obtained from the data sideband region. The measured inclusive fiducial cross section is: σmea = 1776 ± 11(stat) ± 15(syst) ± 44(lumi) fb and the exclusive result is σmea = 1328 ± 11(stat) ± 30(syst) ± 33(lumi) fb. The values are found to be in good agreement with prediction from MATRIX at next-to-next-to-leading order (NNLO) σNNLO = 1797 ± 41 fb and σNNLO = 1293 ± 48 fb for inclusive and exclusive, respectively.
Chen, Kuan-Hsin, та 陳冠昕. "Measurement of Zγ production in 5 fb-1 of pp collisions at √s = 7 TeV with the CMS detector". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/kj92rt.
Повний текст джерела國立中央大學
物理學系
103
Measurements of Zγ production cross section in proton-proton collisions at √s =7 TeV are presented. The results are based on data recorded by the CMS detector at the LHC that correspond to an integrated luminosity of 5.0 fb−1. The cross sections are measured for photon transverse energy > 15 GeV, and for separations between photons and final-state electrons in the pseudorapidity-azimuthal plane of ΔR(e, γ) > 0.7 in eeγ final state. A dielectron invariant mass requirement of di-electron pair > 50 GeV is imposed. The σ(pp → Zγ) × B(Z → e+ e−) is measured to be 5.20 ± 0.13(stat) ± 0.32(syst) ± 0.11(lum) pb. The results are consistent with predictions from the standard model.
Тези доповідей конференцій з теми "Zγ production"
Wagner, Robert G. "CDF results on Zγ production". У The International symposium on vector boson self-interactions. AIP, 1995. http://dx.doi.org/10.1063/1.49323.
Повний текст джерелаAihara, H. "Wγ and Zγ production at tevatron". У The International symposium on vector boson self-interactions. AIP, 1995. http://dx.doi.org/10.1063/1.49296.
Повний текст джерелаBenjamin, Doug. "Wγ and Zγ production at the Tevatron". У The 10th topical workshop on proton−antiproton collider physics. AIP, 1996. http://dx.doi.org/10.1063/1.49656.
Повний текст джерелаGkaitatzis, Stamatios. "Measurement of the ZZ(*) and Zγ production cross sections at 8 TeV and 13 TeV and limits on anomalous triple gauge couplings with the ATLAS detector". У XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects. Trieste, Italy: Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.265.0103.
Повний текст джерела