CMS TOP-11-008: Determination of the Top Quark Mass from the ttbar Cross Section at sqrt(s) = 7 TeV

Abstract

Higher-order QCD predictions are used to extract the top quark mass, both in the pole and in the MSbar scheme, from the top quark pair production cross section measured in the dilepton final state. The analysed dataset corresponds to an integrated luminosity of 1.14 fb^-1 collected by the CMS experiment in 2011 in pp collisions at sqrt(s) = 7 TeV.

Figures and Tables

Figure Caption
cross_section_vs_mass_1.png The cross section (open square) of ttbar production obtained by a combination of measurements in the dilepton channel. The closed circle represents the measured cross section corrected for the m_t^pole dependence at the determined value of m_t^pole using the calculations by Langenfeld et al., Kidonakis and Ahrens et al. The dependence of the measured cross section on m_t^MC is shown as a light shaded band. Different approximate NNLO predictions are shown as differently hatched bands. The uncertainty on the theoretical predictions includes the variation of the scales, parton luminosity and the variation of the alpha_S (M_Z) in the PDF. [Get pdf version]
cross_section_vs_mass_2.png See above. [Get pdf version]
cross_section_vs_mass_3.png See above. [Get pdf version]
mt_herapdf_1.png The cross section (open square) of ttbar production obtained by a combination of measurements in the dilepton channel. The closed circle represents the measured cross section corrected for the m_t^pole dependence at the determined value of m_t^pole using the calculations by Langenfeld et al. using HERAPDF15NNLO PDF. The dependence of the measured cross section on m_t^MC is shown as a light shaded band. The two approximate NNLO predictions are shown as differently hatched bands. The uncertainty on the theoretical predictions includes the variation of the scales, parton luminosity accounting for experimental uncertainties of the PDF and the variation of the alpha_S(M_Z) in the PDF. [Get pdf version]
mt_herapdf_2.png The cross section (open square) of ttbar production obtained by a combination of measurements in the dilepton channel. The closed circle represents the measured cross section corrected for the m_t^pole dependence at the determined value of m_t^pole using the calculations by Ahrens et al. using HERAPDF15NNLO PDF. The dependence of the measured cross section on m_t^MC is shown as a light shaded band. The two approximate NNLO predictions are shown as differently hatched bands. The uncertainty on the theoretical predictions includes the variation of the scales, parton luminosity accounting for experimental uncertainties of the PDF and the variation of the alpha_S(M_Z) in the PDF.[Get pdf version]
m_top_pole.png Top quark pole mass m_t^pole extracted from the measured ttbar cross section compared to results from the D0 Collaboration and the ATLAS Collaboration. The direct top quark mass world average is also shown. The inner error bar on the CMS measurement includes the experimental, PDF and scale variation uncertainty, the outer error bar corresponds to the uncertainty including variation of alpha_S (M_Z) in the PDF. The partial uncertainties are indicated in the figure and have to be added in quadrature. [Get pdf version]
m_top_msbar.png Top quark MSbar mass extracted from the measured ttbar cross section compared to results from the D0 Collaboration. The inner error bar on the CMS measurement includes the experimental, PDF and scale variation uncertainty, the outer error bar corresponds to the uncertainty including variation of alpha_S (M_Z) in the PDF. The partial uncertainties are indicated in the figure and have to be added in quadrature. [Get pdf version]

Table Caption
table1.png The top quark mass in the pole and MSbar definition as obtained using the measured ttbar cross section and approximate NNLO calculations. The uncertainty of the theory includes the variation of the renormalization and factorization scales, the error of the parton luminosity due to experimental uncertainties in the PDFs and the variation of the strong coupling constant in the PDF. [Get pdf version]
table2.png The top quark mass in the pole and MSbar definition as obtained using the measured ttbar cross section and approximate NNLO calculations with HERAPDF15NNLO. The uncertainty of the theory includes the variation of the renormalization and factorization scales, error of the parton luminosity due to experimental uncertainties in the PDFs and the variation of the strong coupling constant in the PDF. [Get pdf version]

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf cross_section_vs_mass_1.pdf r2 r1 manage 17.6 K 2011-09-30 - 11:13 SebastianNaumann  
PNGpng cross_section_vs_mass_1.png r2 r1 manage 73.3 K 2011-09-30 - 11:13 SebastianNaumann  
PDFpdf cross_section_vs_mass_2.pdf r1 manage 17.6 K 2011-09-30 - 11:28 SebastianNaumann  
PNGpng cross_section_vs_mass_2.png r2 r1 manage 72.9 K 2011-09-30 - 11:15 SebastianNaumann  
PDFpdf cross_section_vs_mass_3.pdf r2 r1 manage 17.6 K 2011-09-30 - 11:18 SebastianNaumann  
PNGpng cross_section_vs_mass_3.png r2 r1 manage 73.0 K 2011-09-30 - 11:18 SebastianNaumann  
PDFpdf m_top_msbar.pdf r2 r1 manage 11.4 K 2011-09-30 - 11:11 SebastianNaumann  
PNGpng m_top_msbar.png r2 r1 manage 25.7 K 2011-09-30 - 11:10 SebastianNaumann  
PDFpdf m_top_pole.pdf r2 r1 manage 12.4 K 2011-09-30 - 11:10 SebastianNaumann  
PNGpng m_top_pole.png r2 r1 manage 37.3 K 2011-09-30 - 11:09 SebastianNaumann  
PDFpdf mt_herapdf_1.pdf r1 manage 16.5 K 2011-09-30 - 11:19 SebastianNaumann  
PNGpng mt_herapdf_1.png r1 manage 58.9 K 2011-09-30 - 11:19 SebastianNaumann  
PDFpdf mt_herapdf_2.pdf r1 manage 16.5 K 2011-09-30 - 11:19 SebastianNaumann  
PNGpng mt_herapdf_2.png r1 manage 58.6 K 2011-09-30 - 11:20 SebastianNaumann  
PDFpdf table1.pdf r2 r1 manage 17.1 K 2011-09-30 - 14:53 SebastianNaumann  
PNGpng table1.png r3 r2 r1 manage 44.9 K 2011-09-30 - 15:11 SebastianNaumann  
PDFpdf table2.pdf r2 r1 manage 16.9 K 2011-09-30 - 14:53 SebastianNaumann  
PNGpng table2.png r3 r2 r1 manage 23.0 K 2011-09-30 - 15:11 SebastianNaumann  
Edit | Attach | Watch | Print version | History: r9 < r8 < r7 < r6 < r5 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r9 - 2012-02-08 - RobertoTenchini
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    CMSPublic All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2020 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback