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SUMMARY:Boosting stop searches with boosted di-boson  - Diptimoy Ghosh (IN
 FN and Univeristy of Rome)
DTSTART:20140715T130000Z
DTEND:20140715T140000Z
UID:TALK53415@talks.cam.ac.uk
CONTACT:Marco Nardecchia
DESCRIPTION:The lighter mass eigenstate ($\\widetilde{t}_1$) of the two to
 p squarks\, the scalar superpartners of the top quark\, is extremely diffi
 cult to discover if it is almost degenerate with the lightest neutralino (
 $\\widetilde{\\chi}_1^0$). The current experimental bound\non $\\widetilde
 {t}_1$ mass in this scenario stands only around 250 GeV. For such a light 
 $\\widetilde{t}_1$\, the heavier top squark($\\widetilde{t}_2$) can also b
 e around the TeV scale. I will argue that in such an MSSM scenario\, becau
 se of the high value of the measured higgs mass\, $\\widetilde{t}_2$ is ex
 pected to have considerable branching ratios in the two channels $\\wideti
 lde{t}_2 \\to \\widetilde{t}_1 h$ and $\\widetilde{t}_2 \\to \\widetilde{t
 }_1 Z$. This leads to a spectacular di-boson + missing transverse energy f
 inal state which can also be used to probe the $\\widetilde{t}_1 - \\widet
 ilde{\\chi}_1^0$ coannihilation region of the MSSM parameter space. Moreov
 er\, the $h$ and/or the $Z$ bosons can be sufficiently energetic if the $\
 \widetilde{t}_1$ is light enough allowing the use of jet substructure tech
 nique to dig them out from the\nSM background.  
LOCATION:MR11 (B1.39)\, CMS\, Wilberforce Road\, Cambridge\, CB3 0WB
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