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Measuring Higgs \( \mathcal{C}\mathcal{P} \) and couplings with hadronic event shapes

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Abstract

Experimental falsification or validation of the Standard Model of Particle Physics involves the measurement of the \( \mathcal{C}\mathcal{P} \) quantum number and couplings of the Higgs boson. Both Atlas and Cms have reported an SM Higgs-like excess around m H  = 125 GeV. In this mass range the \( \mathcal{C}\mathcal{P} \) properties of the Higgs boson can be extracted from an analysis of the azimuthal angle distribution of the two jets in pp → H jj events. This channel is also important to measure the couplings of the Higgs boson to electroweak gauge bosons and fermions, hereby establishing the exceptional role of the Higgs boson in the Standard Model. Instead of exploiting the jet angular correlation, we show that hadronic event shapes exhibit substantial discriminative power to separate a \( \mathcal{C}\mathcal{P} \) even from a \( \mathcal{C}\mathcal{P} \) odd Higgs. Some event shapes even show an increased sensitivity to the Higgs \( \mathcal{C}\mathcal{P} \) compared to the azimuthal angle correlation. Constraining the Higgs couplings via a separation of the weak boson fusion and the gluon fusion Higgs production modes can be achieved applying similar strategies.

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Authors and Affiliations

  1. Institute for Particle Physics Phenomenology, Department of Physics, Durham University, DH1 3LE, Durham, United Kingdom

    Christoph Englert & Michael Spannowsky

  2. Institute for Theoretical Physics, Heidelberg University, 69120, Heidelberg, Germany

    Michihisa Takeuchi

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  1. Christoph Englert
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  2. Michael Spannowsky
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  3. Michihisa Takeuchi
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Correspondence to Christoph Englert.

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Englert, C., Spannowsky, M. & Takeuchi, M. Measuring Higgs \( \mathcal{C}\mathcal{P} \) and couplings with hadronic event shapes. J. High Energ. Phys. 2012, 108 (2012). https://doi.org/10.1007/JHEP06(2012)108

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  • DOI: https://doi.org/10.1007/JHEP06(2012)108

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