arXiv 0705.14992007-05hep-ph

Tevatron/LHC的顶级生产和非标准的强相互作用自旋1粒子

Top production at the Tevatron/LHC and nonstandard, strongly interacting spin one particles

Debajyoti Choudhury, Rohini M. Godbole, Ritesh K. Singh, Kshitij Wagh

备注：: 15 pages, uses LaTex, six figures. To appear in Physics Letters B. Reference to and discussion on the forward-backward asymmetry expected even in the SM, added
发表信息：: Phys.Lett.B657:69-76,2007
DOI：: 10.1016/j.physletb.2007.09.057

摘要：

在本说明中，我们考虑可能的限制$t \bar t$生产的规范玻色子的理论与扩展的强相互作用部门，如轴胶子或味泛色。发现此类约束与从dijet数据中获得的约束具有竞争力。来自Tevatron的当前$t \bar t$数据排除了分别在2 $σ$和4 $σ$水平下高达900 GeV和850 GeV的轴胶子质量（$m_A$）。对于风味通用色子的情况，数据排除了在$2 (4) σ$能级低于800 GeV（780 GeV）的质量（$m_C$），以及对于$\cot ξ= 1$，在2 $σ$能级在900 GeV至2.1 TeV之间的质量范围，其中$ξ$是混合角。另一方面，对于$\cot ξ=2$，排除范围是$2 σ$（$4 σ$）水平的$m_C \lsim 950 (920)$ GeV和$m_C \gsim 1.02 (1.15 \lsim m_C \lsim 1.8)$ TeV。我们指出，对于更高的axigluon/coloron质量，即使是dijet通道，对coloron质量的限制，对于$\cot ξ= 1$，可能是不同的axigluon。我们还计算了预期的前向后不对称的情况下，轴胶子，这将使它能够被歧视的SM也色。我们进一步发现，在大型强子对撞机，信号应该是可见的$t \bar t$不变的质谱范围广泛的轴胶子和色子质量仍然允许。我们指出如何顶部极化可用于进一步区分轴胶子和coloron的情况下，从SM以及彼此。

英文摘要：

In this note, we consider possible constraints from $t \bar t$ production on the gauge bosons of theories with an extended strong interaction sector such as axigluons or flavour universal colorons. Such constraints are found to be competitive with those obtained from the dijet data. The current $t \bar t$ data from the Tevatron rule out axigluon masses ($m_A$) up to 900 GeV and 850 GeV at 2 $σ$ and 4 $σ$ levels respectively. For the case of flavour universal colorons the data rule out a mass ($m_C$) below 800 GeV (780 GeV) at the $2 (4) σ$ level and also the mass range between 900 GeV to 2.1 TeV at 2 $σ$ level, for $\cot ξ= 1$, where $ξ$ is the mixing angle. For $\cot ξ=2$ on the other hand, the excluded range is $m_C \lsim 950 (920)$ GeV and $m_C \gsim 1.02 (1.15 \lsim m_C \lsim 1.8)$ TeV at $2 σ$ ($4 σ$) level. We point out that for higher axigluon/coloron masses, even for the dijet channel, the limits on the coloron mass, for $\cot ξ= 1$, may be different than those for the axigluon. We also compute the expected forward-backward asymmetry for the case of the axigluons which would allow it to be discriminated against the SM as also the colorons. We further find that at the LHC, the signal should be visible in the $t \bar t$ invariant mass spectrum for a wide range of axigluon and coloron masses that are still allowed. We point out how top polarisation may be used to further discriminate the axigluon and coloron case from the SM as well as from each other.

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摘要：

英文摘要：

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