Pub Date : 2018-10-01DOI: 10.1088/1674-1137/43/1/013102
Y. Liu 刘, S. Moretti
We study the prospects of probing the anomalous tHq (q = u, c) couplings via SS2L or 3L signatures at the High Luminosity (HL-LHC) run of the 14 TeV CERN collider. We focus on signals of the tH associated production followed by the decay modes t → bℓ+νℓ and H → WW*, and t t ¯ production followed by the decay modes t → bℓ+νℓ and t ¯ → H ( → W W ∗ ) q ¯ , where ℓ = e,μ. Based on two types of H → WW* decay topologies, one assuming the semileptonic decay mode H → WW*→ℓ+νjj and the other the fully leptonic decay mode H → W W ∗ → ℓ + ν ℓ − ν ¯ , we perform a full simulation for signals and backgrounds. It is shown that, at the future HL-LHC, the branching ratio Br(t → uh) (Br(t → ch)) can be probed to 1.17 (1.56) × 10−3 for the same-sign di-lepton channel, and to 7.1 × 10−4 (1.39 × 10−3) for the 3L channel at 3σ sensitivity.
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Pub Date : 1900-01-01DOI: 10.1088/1674-1137/43/1/013103
T. Wang 王, Geng 史 Li 李, Y. Jiang 姜, G. Wang 王
We study the four-body decays of neutral flavored mesons, including K ¯ 0 , D0, B ¯ 0 , and B ¯ s 0 . These processes, which could be induced by a hypothetical doubly-charged scalar particle, do not conserve the lepton number. Assuming, as an example, that the mass of the doubly-charged particle is 1000 GeV, and using the upper bounds of the couplings, we calculate the branching ratios of different channels. For K ¯ 0 → h 1 + h 2 + e − e − , D 0 → h 1 − h 2 − e + e + , and B ¯ d , s 0 → h 1 + h 2 + e − e − , it is of the order of 10−30, 10−32–10−29, and 10−33–10−28, respectively. Based on the experimental results for the D 0 → h 1 − h 2 − l 1 + l 2 + channels, we also find the upper limit for the quantity s Δ h i j M Δ 2 .
我们研究了中性味介子的四体衰变，包括K¯0,D0, B¯0和B¯0。这些过程可能是由一个假设的双带电标量粒子引起的，不守恒轻子数。以双带电粒子的质量为1000 GeV为例，利用耦合的上界，计算了不同通道的分支比。对于K¯0→h 1 + h 2 + e−e−，D 0→h 1−h 2−e + e +， B¯D, s 0→h 1 + h 2 + e−e−，其数量级分别为10−30,10−32-10−29,10−33-10−28。根据d0→h 1−h 2−l 1 + l 2 +通道的实验结果，我们还找到了数量的上限s Δ h j M Δ 2。
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