A bstract A search for supersymmetric partners of top quarks decaying as $$ {\tilde{t}}_1\to c{\tilde{\upchi}}_1^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mover><mml:mi>t</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn></mml:msub><mml:mo>→</mml:mo><mml:mi>c</mml:mi><mml:msubsup><mml:mover><mml:mi>χ</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn><mml:mn>0</mml:mn></mml:msubsup></mml:math> and supersymmetric partners of charm quarks decaying as $$ {\tilde{c}}_1\to c{\tilde{\upchi}}_1^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mover><mml:mi>c</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn></mml:msub><mml:mo>→</mml:mo><mml:mi>c</mml:mi><mml:msubsup><mml:mover><mml:mi>χ</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn><mml:mn>0</mml:mn></mml:msubsup></mml:math> , where $$ {\tilde{\upchi}}_1^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mover><mml:mi>χ</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn><mml:mn>0</mml:mn></mml:msubsup></mml:math> is the lightest neutralino, is presented. The search uses 36.1 fb −1 pp collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider and is performed in final states with jets identified as containing charm hadrons. Assuming a 100% branching ratio to $$ c{\tilde{\upchi}}_1^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>c</mml:mi><mml:msubsup><mml:mover><mml:mi>χ</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn><mml:mn>0</mml:mn></mml:msubsup></mml:math> , top and charm squarks with masses up to 850 GeV are excluded at 95% confidence level for a massless lightest neutralino. For $$ {m}_{{\tilde{t}}_1,{\tilde{c}}_1}-{m}_{{\tilde{\upchi}}_1^0} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>m</mml:mi><mml:mrow><mml:msub><mml:mover><mml:mi>t</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn></mml:msub><mml:mo>,</mml:mo><mml:msub><mml:mover><mml:mi>c</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn></mml:msub></mml:mrow></mml:msub><mml:mo>−</mml:mo><mml:msub><mml:mi>m</mml:mi><mml:msubsup><mml:mover><mml:mi>χ</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn><mml:mn>0</mml:mn></mml:msubsup></mml:msub></mml:math> < 100 GeV, top and charm squark masses up to 500 GeV are excluded.
Tópico:
Particle physics theoretical and experimental studies
