Higgs & Top at LHeC



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CERN - Tokyo Tech - (Liverpool)
Masahiro Kuze
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In the meeting today, Kechen present the preliminary results of measuring the inclusive neutral-current production of Higgs at the LHeC, which can be used to extract the model-independent HZZ coupling and finally the Higgs total decay width.
Since the z-momentum of the incoming quark p_z (or the center-of-mass energy sqrt(s) of the collision) is unknown, one cannot calculate the recoil mass directly as at the e-e+ colliders.
However, p_z can be solved as a function of m_{recoil}.
One can assuming m_{recoil} = m_h = 125 GeV and calculate the
corresponding p_z.
In this way, the whole distribution of the p_z can be used to reject the

(1) Kechen's slides show that the p_z distribution of the incoming quark peaks around 600 GeV for the signal,
but the peak is not very sharp and it has a long tail.
Unfortunately, the background also has a similar distribution, which makes the
“recoil mass method” difficult to distinguishing between signal and background.

(2) Uta suggested that the center-of-mass energy could be measured by s=Q^2/(x*y).
One can rely only on FS particles to reconstruct Q^2, x and y using e.g. the double angle method for high Q^2 values.
Need better understanding this method at ep colliders.

(3) We need to understand how to estimate and suppress background process, such as DIS "p e- > j e- + X" process.

There are minutes attached to this event. Show them.
    • 11:00 11:10
      Update on invisible decay study 10m
      Speaker: Satoshi Kawaguchi (Tokyo Institute of Technology (JP))
    • 11:10 11:20
      Hbb coupling measurement 10m
      Speaker: Masahiro Tanaka (Tokyo Institute of Technology (JP))
    • 11:20 11:30
      On gHZZ via Recoil Mass in NC DIS 10m
      Speaker: Uta Klein (University of Liverpool (GB))
    • 11:30 11:40
      H to phiphi to 4b 10m
      Speaker: Mr Chen Zhang (Peking University)
    • 11:40 11:50
      Recoil Mass in NC DIS 10m
      Speaker: Dr Kechen Wang (DESY / IHEP)
    • 11:50 12:00
      Status of Wits Studies 10m
      Speakers: Mukesh Kumar (University of the Witwatersrand (ZA)), Xifeng Ruan (University of the Witwatersrand (ZA))
    • 12:00 12:10
      FCNC top-Higgs couplings 10m
      Speaker: hao sun (DaLian University of Technology)
    • 12:10 12:20
      Top-q-gamma FCNC 10m
      Speakers: Orhan CAKIR (Ankara University), Orhan Cakir (University of Ankara (TR)), Orhan Cakir (University of Ankara (TR)), Prof. Orhan Cakir (Ankara University (TR)), Orhan Cakir (University of Ankara)
    • 12:20 12:30
      Study on anomalous triple gauge couplings at LHeC and FCC-eh 10m
      Speakers: Orhan Cakir (University of Ankara), Orhan Cakir (University of Ankara (TR)), Orhan Cakir (University of Ankara (TR))
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