Disentangling the spin-parity of a resonance via the gold-plated decay mode

  • Searching for new resonances and finding out their properties is an essential part of any existing or future particle physics experiment. The nature of a new resonance is characterized by its spin, charge conjugation, parity, and its couplings with the existing particles of the Standard Model. If a new resonance is found in the four lepton final state produced via two intermediate Z bosons, the resonance could be a new heavy scalar or a Z' boson or even a higher spin particle. In such cases a step by step methodology as enunciated in this paper can be followed to determine the spin, parity and the coupling to two Z bosons of the parent particles, in a fully model-independent way. In our approach we show how three uni-angular distributions and a few experimentally measurable observables can conclusively tell us about the spin, parity as well as the couplings of the new resonance to two Z bosons. We have performed a numerical analysis to validate our approach and showed how the uni-angular observables can be used to disentangle the spin parity as well as the coupling of the resonance.
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Tanmoy Modak, Dibyakrupa Sahoo, Rahul Sinha, Hai-Yang Cheng and Tzu-Chiang Yuan. Disentangling the spin-parity of a resonance via the gold-plated decay mode[J]. Chinese Physics C, 2016, 40(3): 033002. doi: 10.1088/1674-1137/40/3/033002
Tanmoy Modak, Dibyakrupa Sahoo, Rahul Sinha, Hai-Yang Cheng and Tzu-Chiang Yuan. Disentangling the spin-parity of a resonance via the gold-plated decay mode[J]. Chinese Physics C, 2016, 40(3): 033002.  doi: 10.1088/1674-1137/40/3/033002 shu
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Received: 2015-09-01
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    Supported in part by MOST (Taiwan)(103-2112-M-001-005 (HYC), 101-2112-M-001-005-MY3 (TCY))

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Disentangling the spin-parity of a resonance via the gold-plated decay mode

    Corresponding author: Tanmoy Modak,
    Corresponding author: Dibyakrupa Sahoo,
    Corresponding author: Rahul Sinha,
    Corresponding author: Hai-Yang Cheng,
    Corresponding author: Tzu-Chiang Yuan,
  • 1.  The Institute of Mathematical Sciences, Taramani, Chennai 600113
  • 2.  Institute of Physics, Academia Sinica, Taipei, 11529
Fund Project:  Supported in part by MOST (Taiwan)(103-2112-M-001-005 (HYC), 101-2112-M-001-005-MY3 (TCY))

Abstract: Searching for new resonances and finding out their properties is an essential part of any existing or future particle physics experiment. The nature of a new resonance is characterized by its spin, charge conjugation, parity, and its couplings with the existing particles of the Standard Model. If a new resonance is found in the four lepton final state produced via two intermediate Z bosons, the resonance could be a new heavy scalar or a Z' boson or even a higher spin particle. In such cases a step by step methodology as enunciated in this paper can be followed to determine the spin, parity and the coupling to two Z bosons of the parent particles, in a fully model-independent way. In our approach we show how three uni-angular distributions and a few experimentally measurable observables can conclusively tell us about the spin, parity as well as the couplings of the new resonance to two Z bosons. We have performed a numerical analysis to validate our approach and showed how the uni-angular observables can be used to disentangle the spin parity as well as the coupling of the resonance.

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