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| META TOPICPARENT |
name="JonButterworth" |
Identifying massive hadronic decays in SUSY decay chains. |
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The SLHA file for John's \delta point has been generated with ISAJET 7.69, and SUSY decays added with SDecay 1.1. I checked the decays with the ones given by ISAJET and modulo small numerical differences they look the same. The file is attached. Also attached is the NLO cross sections for \delta as calculated with Prospino2. |
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< | Plots for \delta have been produced and attached. A short description of the plots follow:
- Top left: pT of jets with pT>15. In red is shown jets matched to a parton level W (by the usual distance \Delta R).
- Top right: Same color coding. pTsqrt(y).
- Bottom left: Same color coding. Mass of jet as given from jet algorithm.
- Bottom right: In red (signal) events with two decays of the type q_L -> q + chi+-1 -> qW chi01. Invariant mass of w+jet after cuts demanding two jets with pT>150, 1.2<y<2, 70<m_j<110. The additional jet is picked from the two hardes jets of the event.
Note that the three first plots have been normalized. |
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> | Plots for \delta have been produced and attached. As a first attempt we are looking for events were two W have been produced in chargino decays. The decay chain we are looking for is ~q_L -> q + ~chargino_1 -> q + W + ~neutralino_1.
A short description of the plots follow:
- Top left: Plot of pT of jets. Cut on pT>15 and |\eta| < 2.5. In red is shown jets matched to a parton level W (by the usual distance \Delta R < 0.1).
- Top right: Plot of jet mass m_W as given from jet algorithm. Same color coding. Cut on jet pT: 150 GeV < pT < 600 GeV.
- Bottom left: Plot of jet log(pT*sqrt(y)). Same color coding. Cut on jet pT: 150 GeV < pT < 600 GeV. Cut on jet mass: 80 GeV < m_W < 90 GeV.
- Bottom right: Plot of invariant mass of w+jet system. We require two W's identified in each event from the cuts given above pluss a cut on separation scale: 1.3 < log(pT*sqrt(y)) < 2.0. The W candidates are combined with the two hardest jets in the event. In red (signal) events with two decays of the type mentioned above.
Note that the three first plots have been normalized, and the cuts have been added |
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We have discrimination between the W's and other jets as seen from the first three plots, but the invariant mass plot shows there are too many W candidates around after cuts. Note the a part of the problem is the copious production of top quarks in this model, which can be seen as peaks in the invariant mass plot. I'm still working on the numbers for how efficient the cuts are and how much of the problem is caused by the real W's produced in other decays, and how much is being faked by other jets.
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| META FILEATTACHMENT |
attr="" autoattached="1" comment="Cross sections at NLO for \delta calculated with Prospino2" date="1153423812" name="delta.xsec" path="delta.xsec" size="10409" user="Main.AreRaklev" version="" |
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| META FILEATTACHMENT |
attachment="delta.ps" attr="" comment="Som start-up plots for \delta" date="1153430363" name="delta.ps" path="delta.ps" size="29109" stream="delta.ps" user="Main.AreRaklev" version="0" |
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| META FILEATTACHMENT |
attr="" autoattached="1" comment="Som start-up plots for \delta" date="1153430365" name="delta.ps" path="delta.ps" size="29109" user="Main.AreRaklev" version="" |
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| META FILEATTACHMENT |
attr="" autoattached="1" comment="SLHA file for the \delta benchmark" date="1153400562" name="delta_slha.dat" path="delta_slha.dat" size="46913" user="Main.AreRaklev" version="" |
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