2022/01/07(Fri)
11:00 -12:00
五樓第一會議室 5F, 1st Meeting Room
視訊演講 Video Seminar [ Meeting Link / ID: 2568 / Password: jZYPRqCt638 ]
Title
New angular (and other) cuts to improve the higgsino signal at the LHC
Speaker
沈淑莉博士 (國立台灣大學物理學系) Dr. Dibyashree Sengupta (Department of Physics, National Taiwan University)Abstract
Motivated by the fact that naturalness arguments strongly suggest that the SUSY-preserving higgsino mass parameter µ cannot be too far above the weak scale, we re-examine higgsino pair production in association with a hard QCD jet at the HL-LHC. We focus on l+l- + MET + j events from the production and subsequent decay, \tilde{\chi}^0_2 → \tilde{\chi}^0_1 l+ l-, of the heavier neutral higgsino. The novel feature of our analysis is that we suggest angular cuts to reduce the important background from Z(→ tau tau ) + j events more efficiently than the m^2_{tau tau} < 0 cut that has been used by the ATLAS and CMS collaborations. Other cuts, needed to reduce backgrounds from tt¯, WW j and W/Z + l\bar{l} production, are also delineated. We plot out the reach of LHC14 for 300 and 3000 fb−1 and also show distributions that serve to characterize the higgsino signal, noting that higgsinos may well be the only superpartners accessible at LHC14 in a well-motivated class of natural SUSY models.
Language
演講語言 (Language): in English
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