Dilepton Event candidates

Check also Dilepton events dashboard

Control distributions for the selected events

The standard event selection for dilepton events is applied. Check pass5 selection.

Dilepton mass
Leading jets mass
Missing transverse energy (pFlow)
MET significance (pFlow)
Leptonic transverse momentum sum (ST)
Full transverse momentum sum (HT)
Jet significance ( MET/ projected jet pT )

Top mass distributions

For the selected events the top quark mass is reconstructed with the KIN method. The mass points are distributed according to a variable which is expected to represent how the Missing Transverse Energy reconstruction is affected by jet energy corrections, especially in Drell-Yan events.

| Region | *Distributions for *||| *Distributions for *

Signal region
Z region

Two simple cuts are defined to clean further high mass tails and shown for comparison in the following table

Top quark mass	Selection region	Before cleaning	Cleaning version 1	Cleaning version 1.2	Cleaning version 2	Cleaning version 3
			No jets back-to-back with MET, i.e.	Similar cuts to version 1 but MET 20 for all channels
			No jets collinear with MET, i.e.
	Signal region
	Z region
	Signal region M(top,anti-top)

Results for 22/pb

Jet/MET cleaning (version 1) is applied to the 22/pb of acquired data. The results with the nominal MET cut and the lowered MET cut to 20 are shown below:

Region	Nominal MET cut	MET20
Signal region
Z region

The lepton-jet invariant mass can be constructed for each one of the leading jets (2 combinations per event) or for the lepton-jet combination which is assigned by the KIN method. The results are shown below:

All combinations (leading jets)	Assigned combination

Event list

The table below lists the selected events and their main characteristics. Events are ordered by increasing top quark mass estimate. The jet-met cleaning proposed in the previous Section is not applied here. The distributions of the solutions found for the top quark mass in these events can be found in these slides.

Run;Event;Lumi Section	Dilepton	Top Mass	MET	MET significance			Dilepton mass		Leading jet	Next-leading-jet
147219,17549801,26	ee	107	42	25	182	-3.09	143	281	35	34	82	2.6	0.4	3.0
147451,139902700,120	emu	120	48	69	120	-2.44	89	268	79	70	147	-2.7	1.2	2.4
146644,1474762272,2074	mumu	122	24	5	79	-0.98	37	151	37	35	91	1.9	0.4	2.4
148862,659905363,447	mumu	141	23	12	71	-2.99	48	260	69	61	129	2.7	0.2	2.9
144089,1190110762,1088	ee	145	47	19	152	3.12	131	234	44	38	64	-1.2	0.3	1.4
147048,192568925,206	mumu	149	20	5	131	1.35	72	359	61	52	107	-1.7	2.0	2.6
147219,69124299,102	emu	153	100	195	246	1.88	127	327	42	40	40	-0.5	1.8	2.3
147219,69038984,102	mumu	153	75	133	139	1.89	76	298	105	54	199	2.9	1.2	2.2
147927,2196303,4	emu	155	49	32	143	1.73	75	393	156	94	272	2.8	0.7	2.8
147114,667464467,620	mumu	155	23	9	100	-0.58	28	281	105	45	142	3.0	0.8	2.5
148864,654374646,579	emu	155	64	59	148	-0.68	35	274	51	41	51	0.0	1.9	1.9
146804,739921506,764	ee	156	74	108	130	1.48	42	254	71	53	117	-2.3	1.5	2.4
148862,430865233,287	emu	158	20	3	126	0.08	80	347	67	62	157	2.8	1.2	2.3
146807,183012929,178	emu	159	54	19	241	-2.58	156	413	138	34	139	-2.3	1.7	2.3
148031,479681918,604	ee	159	70	49	169	0.05	33	275	75	31	57	0.1	1.1	1.2
147929,396144712,431	mumu	160	29	8	143	0.21	121	290	91	55	109	-1.5	0.9	2.4
142971,222175234,235	emu	161	35	14	132	-1.51	76	230	52	46	95	2.3	0.1	2.4
148862,353232017,235	mumu	164	122	136	242	-2.52	130	442	137	62	148	-1.6	1.7	3.0
143953,319301054,330	mumu	165	56	93	108	-0.86	23	198	50	40	57	-0.8	2.7	2.8
147048,134625993,161	emu	168	105	195	255	2.17	124	460	166	38	144	-1.7	1.8	2.8
147390,564227635,701	emu	171	45	13	244	2.51	183	329	43	41	79	1.7	0.2	1.9
144011,59336311,44	mumu	172	21	12	88	2.89	75	203	64	51	119	-3.0	0.3	2.8
147217,55188718,75	emu	173	80	113	178	0.72	55	254	44	32	44	-0.9	1.2	2.2
147926,380430462,357	emu	174	62	158	125	-1.47	43	367	123	118	251	-3.1	1.5	1.7
146804,212585078,269	mumu	176	60	54	176	1.84	110	352	113	63	167	1.9	1.5	2.9
140379,136650665,160	mumu	176	56	43	140	0.23	26	245	54	52	130	-0.9	1.3	2.2
142305,15915819,22	emu	178	44	52	185	-0.41	88	344	82	77	123	-1.7	0.3	1.4
148002,113278078,138	mumu	178	27	11	96	0.98	36	335	98	91	188	2.7	0.2	2.9
146644,1255480064,1633	emu	182	68	67	177	-1.77	73	255	45	33	110	-1.6	0.1	1.7
147115,53131618,43	ee	184	33	9	117	-2.43	76	202	54	32	229	-1.3	0.4	0.9
143657,584500498,633	emu	185	35	58	125	1.47	61	348	124	99	199	-2.2	1.9	2.2
146511,365211311,504	ee	187	70	42	249	1.80	206	451	114	88	236	-1.9	0.9	2.8
147216,34569448,46	emu	192	87	72	144	-1.15	87	435	116	112	187	1.8	1.8	2.7
147926,102435902,137	mumu	196	81	105	135	-1.59	40	261	66	60	52	-0.2	2.6	2.9
147450,89900447,130	mumu	198	28	6	120	1.59	71	432	169	143	327	-3.0	0.1	2.8
146644,307415775,345	mumu	200	72	48	280	-3.12	333	382	66	37	95	-2.5	1.0	2.8
147217,112586657,153	ee	200	27	12	104	2.31	69	238	90	45	143	-2.9	0.3	2.6
147114,276016381,340	emu	203	66	74	144	-0.20	45	290	102	44	149	0.7	2.7	2.9
143962,244363110,227	emu	207	23	8	154	2.42	134	299	89	56	195	2.3	1.4	2.5
147926,70668450,114	ee	208	89	106	253	1.01	107	412	118	42	71	0.8	2.7	2.8
147284,160632543,167	mumu	218	26	6	120	-1.09	44	265	79	67	159	-2.5	0.4	2.9
147115,878744,2	emu	230	58	28	111	0.61	70	331	145	75	186	-2.1	1.6	2.6
148029,398160572,512	mumu	258	79	52	196	2.64	203	440	114	66	178	-3.0	0.5	2.5
148862,92684827,59	mumu	283	31	7	153	0.98	73	275	44	43	49	-0.2	0.4	0.6
147390,588810211,736	ee	363	51	26	119	-1.18	64	411	135	114	328	-2.9	1.4	2.0
148864,334989072,284	emu	382	97	92	189	0.94	43	692	269	151	406	2.8	1.0	2.5
148864,594577419,522	emu	383	39	17	190	-1.57	84	416	164	62	84	-0.8	2.1	2.9
147929,537145133,613	mumu	384	47	31	249	0.47	55	551	270	31	277	-2.2	1.6	2.5
147926,174596074,190	emu	384	124	153	331	-0.63	65	889	298	127	425	1.2	2.4	2.7

Event displays for high mass candidate events

Documentation

• pdf: preliminary paper draft
• pdf (tex) preliminary AN update
• pdf: TOP-10-006 status: Top dilepton meeting (Nov. 25, 2010)

-- PedroSilva - 05-Aug-2010