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  • Higgsino WH request update

    Abstract

    Abstract. Estimate of the updated stats for the production of the Higgsino \(\to{}WH\) samples. The decay \(H\to\tau\tau\) will be disabled.

    Introduction

    For now I am just looking at the change in efficiency when skipping the \(H\to\tau\tau\) events with the current samples. We are mostly interested in having a decent number of raw events, so that we don’t run out of statistics at final selection. There are two effects:

    1. change in yield before any selection

    2. change in yield at final selection

    The change in yield before selection is “how much we save” when we generate events without the \(H\tau\tau\) decay. The change in yield at final selection is “how much we loose” because some of the \(H\to\tau\tau\) events are currently in our current final selection.

    The final selection is the same one that I defined back in March. It was defined trying to optimize \(Z_n\). However, because of the limited stats, there were significant fluctuations on the Z_n values from one signal sample to the next. So the choice of the selection criteria was also relying on the efficiency separation between signal and background. That study was made with n0115 ntuples normalized to 13/fb. This update is done witn n0139 ntuples normalized to 21/fb. I have not updated the \(Z_n\) plots because I need to perform some cross-checks with Josephine and Matt on the background yields.

    Here is the link to the previous estimate https://test-gerbaudo.web.cern.ch/test-gerbaudo/tmp/2013-03-20/yields/yields_mc_req_2013-03-19.html and tot he savannah request http://savannah.cern.ch/task/?40831

    Signal regions

    2l, \(\geq\) 2j regions sign flavor
    SR6 Opp. Same
    SR7 Opp. Diff
    SR8 Same Same
    SR9 Same Diff

    Selection criteria

    For SR6 and for SR7 the selection requirements are, addition to sign/flavor:

    \(\Delta R (l_1, l_2)\) < 2.0
    \(p_{T,ll}\) > 50
    \(MET_{rel}\) > 50
    \(m_{ll}\) < 80
    \(abs(m_{\tau\tau} - m_{Z})\) > 40
    \(m_{T}(ll, MET)\) > 50
    \(m_{T, min}(l, MET)\) > 50

    for SR8 and for SR9 the only requirement in addition to sign/flavor is \(MET_{rel}\) > 50. The plots below show thesignal yield, normalized to 13/fb, and the raw counts.

    Results

    Efficiencies

    The signal efficiency for the \(H\to\tau\tau\) veto before selection, figure \ref{fig:fig1}, is \(50\%\) for all signal samples.

    The signal inefficiency for the \(H\to\tau\tau\) veto varies from \(0\%\) to \(10\%\) in SR6 and SR7 (figures \ref{fig:eff-sr6}, \ref{fig:eff-sr7}), and \(0\%\) to \(20\%\) in SR8 and SR9 (figures \ref{fig:eff-sr8}, \ref{fig:eff-sr9}).

    \label{fig:fig1} Fraction of signal events accepted with the \(H\to\tau\tau\) veto