Superheavy-quarkonium production and decays: A new Higgs-boson signal.
Superheavy-quarkonium production and decays: A new Higgs-boson signal.
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超重夸克素的产生和衰变：一个新的希格斯玻色子信号。
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发表时间：
1987
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通讯作者：
Tata
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作者：
Barger;Glover;Hikasa;Keung;Olsson;Suchyta;Tata
我们研究了在多TeV强子对撞机上可能产生的重夸克的S和P波夸克态的产生和随后的衰变。我们的考虑集中在第四代双重态中较轻的成员，对于这种成员，夸克的弱衰变有望被混合角抑制。对于夸克质量为1TeV的夸克粒子，主要的产物是胶子聚变。除了魔咒和海底系统中存在的衰变通道外，重夸克尼亚还可以衰变成${W}^{+}${W}^{mathm{susureath{-}$、${Z}^{0}$${Z}^{0}$和${Z}^{0}$ensureath{Gamma}对。此外，由于重夸克与规范玻色子的纵向分量的耦合，后一衰减率可能被提高。我们评估了通过束缚态衰变发现新的重夸克的前景。质量达到100GeV的夸克可以从${1}^{mathrm{ensuremath{-}}mathrm{ensuremath{-}}}$态衰变为轻子对中找到。如果运动学上允许赝标量夸克态衰变为Z玻色子和希格斯玻色子，那么对于希格斯玻色子，即使是具有2${m}_{t}$${m}_{H}$2${M}_{W}$的中等质量的希格斯玻色子，也有相当清晰的信号。此外，Hensureath{Gamma}和HH对也将以相当大的速率存在。
We study the production and subsequent decays of the S- and P-wave quarkonium states of a heavy quark that may be produced at a multi-TeV hadron collider. Our considerations are focused on the lighter member of a fourth-generation doublet, for which the weak decays of the quark are expected to be suppressed by mixing angles. For quarkonium masses ensuremath{lesssim}1 TeV, the dominant production is via gluon fusion. In addition to the decay channels that are present in the charm and bottom systems, heavy quarkonia can decay into ${W}^{+}$${W}^{mathrm{ensuremath{-}}}$, ${Z}^{0}$${Z}^{0}$, and ${Z}^{0}$ensuremath{gamma} pairs. Furthermore, the latter decay rates may be enhanced due to couplings of the heavy quarks to the longitudinal components of the gauge bosons. We assess the prospects for discovery of a new heavy quark via its bound-state decays. Quarks with masses up to ensuremath{approxeq}100 GeV can be found from the decay of the ${1}^{mathrm{ensuremath{-}}mathrm{ensuremath{-}}}$ state (ensuremath{psi}) into lepton pairs. If the decay of the pseudoscalar quarkonium state into a Z boson and a Higgs boson is kinematically allowed, there is a rather clean signal for the Higgs boson, even for the intermediate-mass Higgs boson with 2${m}_{t}$${m}_{H}$2${M}_{W}$. Furthermore, Hensuremath{gamma} and HH pairs would also be present at fairly large rates.