Progress in Jet Clustering Algorithm Study with Durham Method

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Application of Durham algorithm to event samples at Asian Physics & Software Meeting showed potential with slight improvement in significance. Future focus on paper writing and algorithm version upgrading.

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AA->HH Study Current Status Shin-ichi Kawada (AdSM, Hiroshima University) Asian Physics & Software Meeting (2011/12/2) 1

Progress I applied the Durham algorithm to event samples. Asian Physics & Software Meeting (2011/12/2) 2

Cut Summary(JADE)(training sample)(test sample) HH 80 WW ZZ 4b expected events (# of MC samples) 73100000 (75000000) 59350 (1000000) 293600 (1000000) (50000) pre-selection 47.72 (29823) 12.30 (7685) 81313 (83426) 21.44 (22) 5172 (87142) 191.6 (3228) 84538 (287935) 591.9 (2016) W filter 4b filter 6.038 (3774) 3.546 (2216) 5.848 (6) 3.899 (4) 62.61 (1055) 4.926 (83) 26.72 (91) 12.62 (43) Z filter ?signal ?signal+ ?BG significance(JADE) = = 0.709 3

Cut Summary(Durham)(training sample)(test sample) HH 80 WW ZZ 4b expected events (# of MC samples) 73100000 (75000000) 59350 (1000000) 293600 (1000000) (50000) pre-selection 42.51 (26567) 9.213 (5758) 56456 (57923) 2.924 (3) 3189 (53738) 82.62 (1392) 67399 (229559) 192.0 (654) W filter 4b filter 6.555 (4097) 4.227 (2642) 1.949 (2) 0.9747 (1) 42.38 (714) 3.383 (57) 26.13 (89) 14.68 (50) Z filter ?signal ?signal+ ?BG significance(Durham) = = 0.876 4

Result Significance was slightly improved. 0.709 (JADE) -> 0.876 (Durham) BUT NOT ENOUGH! Conclusion is not changed. 0.876 (Durham) << 4.74 (cheat) It is possible to suppress huge backgrounds with improved jet clustering. (Conclusion @ LCWS11 & 23rd General Meeting) Asian Physics & Software Meeting (2011/12/2) 5