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Published July 24, 2014 | Published
Journal Article Open

Top squark with mass close to the top quark


The most natural supersymmetric solution to the hierarchy problem prefers the scalar top partner to be close in mass to the top quark. Experimental searches exclude top squarks across a wide range of masses, but a gap remains when the difference between the masses of the stop and the lightest supersymmetric particle is close to the top mass. We propose to search for stops in this regime by exploiting the azimuthal angular correlation of forward tagging jets in (s)top pair production. As shown in earlier work, this correlation is sensitive to the spin of the heavy states, allowing one to distinguish between top and stop pair production. Here, we demonstrate that this angular information can give a statistically significant stop pair production signal in the upcoming LHC run. While the appropriate simulation including parton showering and detector simulation requires some care, we find stable predictions for the angular correlation using multijet merging.

Additional Information

© 2014 American Physical Society. Received 20 April 2014; published 24 July 2014. We would like to thank Stefan Prestel for checking that our MADGRAPH5 simulation makes sense. M. B. would like to thank Maria Spiropulu, Joe Lykken, Yuri Gershtein, and John-Paul Chou for helpful discussion and resources. M. B. and M. J. R. M. thank the Aspen Center for Physics, where this project was originally conceived. Finally, T. P. would like to thank Frank Krauss for deep insights into azimuthal decorrelation. This work was supported in part by U.S. Department of Energy Contract No. DE-SC0011095 (M. J. R. M.).

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Published - PhysRevD.90.014046.pdf


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