SLIDE 21 ■♥❝❧✉s✐✈❡ ♠❡❛s✉r❡♠❡♥ts tt ❝r♦ss✲s❡❝t✐♦♥
❑✐♥❡♠❛t✐❝ ✜t ❛♥❞ ❝r♦ss✲s❡❝t✐♦♥ ❡①tr❛❝t✐♦♥
❑✐♥❡♠❛t✐❝ ✜t ♣❡r❢♦r♠❡❞ t♦ ❝♦♠♣✉t❡ t❤❡ t♦♣✲q✉❛r❦ ♠❛ss ✭mtt✮
r❡❝♦♥str✉❝t✐♦♥ ♦❢ tt ❡✈❡♥ts❀
❦✐♥❡♠❛t✐❝ ✜t ❜❛s❡❞ ♦♥ ❛ ❧✐❦❡❧✐❤♦♦❞ ❛♣♣r♦❛❝❤ t♦ ✜♥❞ t❤❡ ❝♦rr❡❝t
❛ss♦❝✐❛t✐♦♥ ♦❢ ❥❡ts ✇✐t❤ t❤❡ ✜♥❛❧✲st❛t❡ ♣❛rt♦♥s ♦❢ t❤❡ ❛❧❧✲❤❛❞r♦♥✐❝ ❝❤❛♥♥❡❧❀
mt ✉s❡❞ t♦ ♣❡r❢♦r♠ ❛♥ ✉♥❜✐♥♥❡❞ ❧✐❦❡❧✐❤♦♦❞
✜t ❛♥❞ ❡①tr❛❝t t❤❡ ❝r♦ss✲s❡❝t✐♦♥❀
♠❡❛s✉r❡❞ ❝r♦ss✲s❡❝t✐♦♥ ❝♦♠♣❛t✐❜❧❡ ✇✐t❤
t❤❡ ❙▼ ♣r❡❞✐❝t✐♦♥✳
σtt = ✶✻✽ ± ✶✷(stat.)✻✵
−✺✼(syst.) ± ✼(lumi)pb
[GeV]
t
m 100 200 300 400 500 600 700 Events/10 GeV 50 100 150 200 250 Data signal t t Multijet background ATLAS Preliminary
L dt = 4.7 fb
∫
❙❡r❡♥❛ P❛❧❛③③♦ ❙❡♣t❡♠❜❡r ✶✷✱ ✷✵✶✼ ✷✶ ✴ ✷✼