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Presentations / Kstmumu / Weekend_debugging / Systematics.tex
@Marcin Chrzaszcz Marcin Chrzaszcz on 26 Feb 2015 3 KB presentation -a
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  21. \usetheme{Sybila}
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  23. \title[Weekend updates]{Weekend updates}
  24. \author{Marcin Chrz\k{a}szcz$^{1}$, Nicola Serra$^{1}$}
  25. \institute{$^1$~University of Zurich}
  26. \date{\today}
  27.  
  28. \begin{document}
  29. % --------------------------- SLIDE --------------------------------------------
  30. \frame[plain]{\titlepage}
  31. \author{Marcin Chrz\k{a}szcz{~}}
  32. \institute{(UZH)}
  33. % ------------------------------------------------------------------------------
  34. % --------------------------- SLIDE --------------------------------------------
  35. \section{Background studies}
  36. \begin{frame}\frametitle{Weight correlation with $\color{white}{\textbf{B}}$ mass}
  37. \begin{itemize}
  38. \item First thing that come to my mind was the different treatment of background in different methods.
  39. \item Performed a Pearson correlation check for low and high recoil on data sidebands.
  40. \end{itemize}
  41. \begin{columns}
  42.  
  43. \column{2.5in}
  44. \center{$0.1~\GeV^2 q^2 < 8 \GeV^2$}\\
  45. \includegraphics[width=0.9\textwidth]{corr/plot_highrecoil.png}
  46.  
  47.  
  48.  
  49. \column{2.5in}
  50. \center{$15~\GeV^2 q^2 < 19 \GeV^2$}\\
  51. \includegraphics[width=0.9\textwidth]{corr/plot_lowrecoil.png}
  52.  
  53. \end{columns}
  54. \begin{itemize}
  55. \item Clear correlation between mass and unfolding weight.
  56. \item Impact on the analysis has to be studied.
  57. \end{itemize}
  58.  
  59. \end{frame}
  60.  
  61. \begin{frame}\frametitle{First bin problem}
  62. \begin{itemize}
  63. \item I already mentioned this and no one is worried so this is my final calling to everyone caution.
  64. \item All right side band events ($M_{\PB}>5350\MeV$) are comming from 2012. There are no background events in 2011 data!
  65. \item Optimistic calculation:
  66. \begin{itemize}
  67. \item 21 events in $3~\invfb$, 7 events peer $\invfb$.
  68. \item Probability to expect 7 events and observed 0 is $0.0009$ which corresponds to $3.3~\sigma$ significance!
  69. \item Taking into account look elsewhere effect(14 bins): $14\times0.0009= 0.0126$, this is like $2.4~\sigma$.
  70. \end{itemize}
  71. \end{itemize}
  72.  
  73. \center{\includegraphics[width=0.35\textwidth]{53314186647.png}}
  74.  
  75. \end{frame}
  76.  
  77.  
  78.  
  79. \begin{frame}\frametitle{Comparison of Chebyshev fit}
  80. \begin{itemize}
  81. \item Since I wanted to compare more in detail the difference between left and right sideband I fitted a Chebyshev to them separately.
  82. \item All plots: \texttt{wget --user=lhcb --password=2924 \url{http://nz17-p1.ifj.edu.pl/work_public/LHCb/Kst_mumu/Bkg_studies/plots.tar.gz}}
  83. \item Over all I see a tension.
  84. \end{itemize}
  85. \begin{columns}
  86. \column{2.5in}
  87. \center{Left: \\ \includegraphics[width=0.8\textwidth]{bkg/BLIND_Q2_0_1_0_98_left.png}}
  88. \column{2.5in}
  89. \center{Right: \\ \includegraphics[width=0.8\textwidth]{bkg/BLIND_Q2_0_1_0_98_right.png}}
  90. \end{columns}
  91. \end{frame}
  92.  
  93.  
  94. %%%%%%%%%%%%%%%%%%%%%%%
  95.  
  96. \begin{frame}\frametitle{Background conclusions}
  97. To conclude:
  98. \begin{itemize}
  99. \item There are to many hints of something being wrong.
  100. \item I know some of you will say:"Statistically insignificant", but if you add them up you are looking at something that is starting to be significant.
  101. \end{itemize}
  102. \end{frame}
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  106.  
  107. \end{document}