Search for production of a single vectorlike quark decaying to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mi>H</mml:mi></mml:math> or <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mi>Z</mml:mi></mml:math> in the all-hadronic final state in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math> collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>13</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>
Aram Hayrapetyan, A. Tumasyan, W. Adam, Janik Walter Andrejkovic, T. Bergauer, S. Chatterjee, K. Damanakis, M. Dragicevic, Priya Sajid Hussain, M. Jeitler, Natascha Krammer, A. Li, D. Liko, I. Mikulec, J. Schieck, R. Schöfbeck, D. Schwarz, M. Sonawane, S. Templ, W. Waltenberger, C.-E. Wulz, M. R. Darwish, X. Janssen, P. Van Mechelen, E. S. Bols, J. D’Hondt, Soumya Dansana, A. De Moor, M. Delcourt, H. El Faham, S. Lowette, I. Makarenko, D. Müller, A. R. Sahasransu, S. Tavernier, M. Tytgat, G. P. Van Onsem, S. Van Putte, D. Vannerom, B. Clerbaux, G. De Lentdecker, L. Favart, D. Hohov, J. Jaramillo, Ali Khalilzadeh, K. Lee, M. Mahdavikhorrami, A. Malara, S. Paredes, L. Pétré, N. Postiau, Laurent Thomas, M. Vanden Bemden, C. Vander Velde, P. Vanlaer, M. De Coen, D. Dobur, Y. Hong, J. Knolle, Luka Lambrecht, Gianny Mestdach, C. Rendón, A. Samalan, K. Skovpen, N. Van Den Bossche, Jan van der Linden, Liam Wezenbeek, A. Benecke, A. Bethani, G. Bruno, C. Caputo, C. Delaere, I. S. Donertas, A. Giammanco, K. Jaffel, Sa. Jain, V. Lemaitre, J. Lidrych, Paola Mastrapasqua, K. Mondal, T. T. Tran, S. Wertz, G. A. Alves, E. Coelho, C. Hensel, T. Menezes De Oliveira, A. Moraes, P. Rebello Teles, M. Soeiro, W. L. Aldá Júnior, M. Alves Gallo Pereira, M. Barroso Ferreira Filho, H. Brandao Malbouisson, W. Carvalho, J. Chinellato, E. M. Da Costa, G. G. Da Silveira, D. De Jesus Damião, S. Fonseca De Souza, R. Gomes De Souza
Abstract
A search for electroweak production of a single vectorlike <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>T</a:mi></a:math> quark in association with a bottom (<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>b</c:mi></c:math>) quark in the all-hadronic decay channel is presented. This search uses proton-proton collision data at <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:msqrt><e:mi>s</e:mi></e:msqrt><e:mo>=</e:mo><e:mn>13</e:mn><e:mtext> </e:mtext><e:mtext> </e:mtext><e:mi>TeV</e:mi></e:math> collected by the CMS experiment at the CERN LHC during 2016–2018, corresponding to an integrated luminosity of <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mn>138</g:mn><g:mtext> </g:mtext><g:mtext> </g:mtext><g:msup><g:mi>fb</g:mi><g:mrow><g:mo>−</g:mo><g:mn>1</g:mn></g:mrow></g:msup></g:math>. The <i:math xmlns:i="http://www.w3.org/1998/Math/MathML" display="inline"><i:mi>T</i:mi></i:math> quark is assumed to have charge <k:math xmlns:k="http://www.w3.org/1998/Math/MathML" display="inline"><k:mn>2</k:mn><k:mo>/</k:mo><k:mn>3</k:mn></k:math> and decay to a top (<m:math xmlns:m="http://www.w3.org/1998/Math/MathML" display="inline"><m:mi>t</m:mi></m:math>) quark and a Higgs (<o:math xmlns:o="http://www.w3.org/1998/Math/MathML" display="inline"><o:mi>H</o:mi></o:math>) or <q:math xmlns:q="http://www.w3.org/1998/Math/MathML" display="inline"><q:mi>Z</q:mi></q:math> boson. Hadronic decays of the <s:math xmlns:s="http://www.w3.org/1998/Math/MathML" display="inline"><s:mi>t</s:mi></s:math> quark and the <u:math xmlns:u="http://www.w3.org/1998/Math/MathML" display="inline"><u:mi>H</u:mi></u:math> or <w:math xmlns:w="http://www.w3.org/1998/Math/MathML" display="inline"><w:mi>Z</w:mi></w:math> boson are reconstructed from the kinematic properties of jets, including those containing <y:math xmlns:y="http://www.w3.org/1998/Math/MathML" display="inline"><y:mi>b</y:mi></y:math> hadrons. No deviation from the standard model prediction is observed in the reconstructed <ab:math xmlns:ab="http://www.w3.org/1998/Math/MathML" display="inline"><ab:mi>t</ab:mi><ab:mi>H</ab:mi></ab:math> and <cb:math xmlns:cb="http://www.w3.org/1998/Math/MathML" display="inline"><cb:mi>t</cb:mi><cb:mi>Z</cb:mi></cb:math> invariant mass distributions. The 95% confidence level upper limits on the product of the production cross section and branching fraction of a <eb:math xmlns:eb="http://www.w3.org/1998/Math/MathML" display="inline"><eb:mi>T</eb:mi></eb:math> quark produced in association with a <gb:math xmlns:gb="http://www.w3.org/1998/Math/MathML" display="inline"><gb:mi>b</gb:mi></gb:math> quark and decaying via <ib:math xmlns:ib="http://www.w3.org/1998/Math/MathML" display="inline"><ib:mi>t</ib:mi><ib:mi>H</ib:mi></ib:math> or <kb:math xmlns:kb="http://www.w3.org/1998/Math/MathML" display="inline"><kb:mi>t</kb:mi><kb:mi>Z</kb:mi></kb:math> range from 1260 to 68 fb for <mb:math xmlns:mb="http://www.w3.org/1998/Math/MathML" display="inline"><mb:mi>T</mb:mi></mb:math> quark masses of 600–1200 GeV. © 2024 CERN, for the CMS Collaboration 2024 CERN