Single Production of Vectorlike Y Quarks at the HL-LHC

We study single production of exotic vectorlike Y quark with electric charge <math altimg="si1.svg"><mo stretchy="false">|</mo><msub><mrow><mi>Q</mi></mrow><mrow><mi>Y</mi></mrow></msub><mo stretchy="false">|</mo><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>4</mn><mo stretchy="false">/</mo><mn>3</mn></math> and its subsequent decay at the High Luminosity LHC (HL-LHC). Most of the vector like quark (VLQ) decays have the electroweak W bosons in the intermediate state. Besides their direct productions singly or pairs, the W-bosons are involved in decay chains as a result of the decay of a top quark which contributes to the background. This is particularly the case since vectorlike Y quark, which is estimated to be produced with a high cross-section, can only decay via a W boson and a down type quark (<math altimg="si2.svg"><mi>d</mi><mo>,</mo><mi>s</mi><mo>,</mo><mi>b</mi></math>). We calculate the cross sections of signal (for different couplings and mass values) and relevant Standard Model (SM) backgrounds. After a fast simulation of signal and background events, estimations of the sensitivity to the parameters (mass range 1000-2500 GeV for coupling value <math altimg="si3.svg"><msub><mrow><mi>κ</mi></mrow><mrow><mi>Y</mi></mrow></msub><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>0.5</mn></math>, and mass range 500-2000 GeV for coupling values <math altimg="si4.svg"><msub><mrow><mi>κ</mi></mrow><mrow><mi>Y</mi></mrow></msub><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>0.3</mn></math> and <math altimg="si5.svg"><msub><mrow><mi>κ</mi></mrow><mrow><mi>Y</mi></mrow></msub><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>0.15</mn></math>) have been presented at the HL-LHC with centre of mass energy <math altimg="si6.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>14</mn></math> TeV and integrated luminosity projections of 300 fb<sup loc="post">−1</sup>, 1000 fb<sup loc="post">−1</sup> and 3000 fb<sup loc="post">−1</sup>.