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arXiv 1808.03124hep-ex
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寻找在$\sqrt{s} =$ 13 TeV质子-质子碰撞中衰变到夸克对的成对产生共振

Search for pair-produced resonances decaying to quark pairs in proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

一般搜索对生产的共振,每个衰变到两个夸克,报告。对于较重的共振(质量超过400 GeV)和较轻的共振(质量在80和400 GeV之间),分别进行搜索,其中四个终态夸克中的每一个都产生强子喷流,从而产生四喷流签名,而对于较轻的共振(质量在80和400 GeV之间),每个共振的夸克对被准直并重建为单个喷流,从而产生两个喷流签名。此外,一个b标记的选择被应用到与底夸克在最终状态的目标共振。该分析使用的数据收集与CMS检测器在欧洲核子研究中心大型强子对撞机,对应的积分亮度为35.9 fb $^{-1}$,从质子-质子碰撞的质心能量为13 TeV。质谱分析新的共振的存在下,并发现与标准模型的预期是一致的。结果被解释在$R$宇称破坏超对称性的框架下,假设标量顶夸克通过强子耦合$λ_{312}''$或$λ_{323}''$衰变的对产生,并设定了顶夸克质量函数的截面上限。这些结果探测了比以前在LHC探测的更宽的质量范围,并扩展了$\widetilde{\mathrm{t}}$ $\to$ qq $'$方案中的最高夸克质量限制。

英文摘要:

A general search for the pair production of resonances, each decaying to two quarks, is reported. The search is conducted separately for heavier resonances (masses above 400 GeV), where each of the four final-state quarks generates a hadronic jet resulting in a four-jet signature, and for lighter resonances (masses between 80 and 400 GeV), where the pair of quarks from each resonance is collimated and reconstructed as a single jet resulting in a two-jet signature. In addition, a b-tagged selection is applied to target resonances with a bottom quark in the final state. The analysis uses data collected with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 35.9 fb$^{-1}$, from proton-proton collisions at a center-of-mass energy of 13 TeV. The mass spectra are analyzed for the presence of new resonances, and are found to be consistent with standard model expectations. The results are interpreted in the framework of $R$-parity-violating supersymmetry assuming the pair production of scalar top quarks decaying via the hadronic coupling $λ_{312}''$ or $λ_{323}''$, and upper limits on the cross section as a function of the top squark mass are set. These results probe a wider range of masses than previously explored at the LHC, and extend the top squark mass limits in the $\widetilde{\mathrm{t}}$ $\to$ qq$'$ scenario.

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