Fresh look at the LHC limits on scalar leptoquarks
Arvind Bhaskar, Aditya Das, Tanumoy Mandal, Subhadip Mitra, Rachit Sharma
Abstract
The scalar-leptoquark (sLQ) parameter space is well explored experimentally. The direct pair production searches at the LHC have excluded light sLQs almost model agnostically, and the high-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>p</a:mi><a:mi mathvariant="normal">T</a:mi></a:msub></a:math> dilepton tail data have put strong bounds on the leptoquark-quark-lepton Yukawa couplings for a wide range of sLQ masses. However, these do not show the complete picture. Previously, Mandal [Single productions of colored particles at the LHC: An example with scalar leptoquarks, ] showed how the dilepton-dijet data from the pair production searches could give strong limits on these couplings. This was possible by including the single-production contribution to the dilepton-dijet signal. In this paper, we take a fresh look at the LHC limits on all sLQs by following the same principle and combine all significant contributions—from pair and single productions, <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mi>t</d:mi></d:math>-channel sLQ exchange and its interference with the Standard Model background—to the <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"><f:mi>μ</f:mi><f:mi>μ</f:mi><f:mi>j</f:mi><f:mi>j</f:mi></f:math> final state and recast the limits. We notice that the sLQ exchange and its interference with the background processes play significant roles in the limits. The <h:math xmlns:h="http://www.w3.org/1998/Math/MathML" display="inline"><h:mi>μ</h:mi><h:mi>μ</h:mi><h:mi>j</h:mi><h:mi>j</h:mi></h:math>-recast limits are comparable to or, in some cases, significantly better than the currently known limits (from high-<j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"><j:msub><j:mi>p</j:mi><j:mi mathvariant="normal">T</j:mi></j:msub></j:math> dilepton data and direct searches), i.e., the LHC data rules out more parameter space than what is considered in the current literature. For the first time, we also show how including the QED processes can noticeably improve the sLQ mass exclusion limits from the QCD-only limits. Published by the American Physical Society 2024