Abstract We study the impact of contact interactions involving two leptons (electrons or muons) and two b-quarks ( b b ¯ l + l − ) on the high-mass di-lepton region at the LHC. We consider different selections of b-tagged jet multiplicities in the di-lepton final states: inclusive (no selection), 0, 1 and 2 b-tagged jets, and show that the single b-jet selection significantly improves the sensitivity to New Physics (NP) in the form of the b b ¯ l + l − contact term. We obtain a better sensitivity compared to the currently existing searches of NP in the di-lepton inclusive channel. In particular, the expected limits go beyond competitive bounds set by LEP (for electrons) on the scale of NP, Λ, by a factor of 1.2 − 3.1 , depending on the chirality structure of the operator. In addition, the expected limits on Λ, set by using a non-resonant LHC di-lepton inclusive search, are expected to be improved by a factor of 1.3 − 1.4 for both electrons and muons.

中文翻译：

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用 bb¯ℓ+ℓ− 接触相互作用寻找新物理

摘要 我们研究了涉及两个轻子（电子或介子）和两个 b 夸克（bb ¯ l + l − ）的接触相互作用对 LHC 的大质量双轻子区域的影响。我们考虑了双轻子最终状态中 b 标记射流多样性的不同选择：包含（无选择）、0、1 和 2 个 b 标记射流，并表明单个 b 射流选择显着提高了对新物理学的敏感性(NP) 以 bb ¯ l + l - 接触项的形式。与目前在双轻子包含通道中对 NP 的搜索相比，我们获得了更好的灵敏度。特别是，根据操作符的手性结构，预期限制超出了 LEP（对于电子）在 NP 和 Λ 尺度上设定的竞争界限 1.2 - 3.1 倍。此外，Λ 的预期限制，