LHCb Web>MassFitting (revision 7)~~EditAttach~~

G-Fact Mass Fitting

Validation of signal fraction fitter (Lars)

To validate the signal fraction fitter (aka mass fitter) a series of data sets were generated with different mixes of signals and combinatoric background were generated. Each data set has approximately 1000 toy data sets with 100k events each. All data sets are located in /data/lhcb01/eklund/B2hhToyData/, in sub-directories as given below.

Event mix: Bd -> π π, Bd -> K π

Directory: BdMix _561pipi_103Kpi/, 1000 data sets, 100k events each

	True S.F.	Initial value	Mean [%]	Sigma [%]	Pull mean	Pull sigma
Bd->π+π-	56.1	55	56.12	0.19	0.11+/-0.03	1.00+/-0.02
Bd->K+π-	5.665	5	5.657	0.084	-0.12+/-0.03	1.03+/-0.02
Bd->K-π+	4.635	5	4.619	0.078	-0.21+/-0.03	0.99+/-0.02
Combinatoric	33.6	35	33.60

Event mix: Bd -> π π, Bd -> K π, Bs -> K K

Directory: Mix_Bd2pipiKpiNBs2KK/ , 940 data sets, 100k events each

	True S.F.	Initial value	Mean [%]	Sigma [%]	Pull mean	Pull sigma
Bd->π+π-	24	20	23.99	0.18	-0.04+/-0.03	1.01+/-0.03
Bd->K+π-	11	10	10.98	0.11	-0.16+/-0.03	1.01+/-0.02
Bd->K-π+	9	10	8.98	0.11	-0.21+/-0.04	1.05+/-0.03
Bs->K+K-	21	25	21.04	0.14	0.27+/-0.03	1.00+/-0.03
Combinatoric	35	35	35.02

Event mix: Bd -> π π, Bd -> K π, Bs -> K K, Bs -> K π

Directory: Mix_BdNBs2pipiKpiKK/ , 860 data sets, 100k events each

	True S.F.	Initial value	Mean [%]	Sigma [%]	Pull mean	Pull sigma
Bd->π+π-	20	23	19.98	0.17	-0.12+/-0.03	0.98+/-0.03
Bd->K+π-	13.75	12	13.75	0.14	-0.01+/-0.03	0.99+/-0.02
Bd->K-π+	11.25	12	11.24	0.13	-0.08+/-0.03	0.97+/-0.03
Bd->K+K-	15	12	15.03	0.14	0.21+/-0.03	0.99+/-0.03
Bd->K+π-	5.56	5	5.56	0.10	0.01+/-0.04	1.02+/-0.03
Bd->K-π+	2.44	5	2.43	0.07	-0.11+/-0.03	0.98+/-0.03
Combinatoric	32	35	35.02

Paul's study with the signal fraction fitting

Just start typing here paul....This is a link.

-- AlisonBates - 2010-08-06

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who
png	Mix1_Bd2KminusPiplus_pull.png	r1	manage	21.9 K	2010-09-21 - 10:16	LarsEklund
png	Mix1_Bd2KplusPiminus_pull.png	r1	manage	23.7 K	2010-09-21 - 10:16	LarsEklund
png	Mix1_Bd2PiPi_pull.png	r1	manage	20.2 K	2010-09-21 - 10:16	LarsEklund
png	Mix2_Bd2KK_pull.png	r1	manage	20.9 K	2010-09-21 - 11:23	LarsEklund
png	Mix2_Bd2KminusPiplus_pull.png	r1	manage	21.5 K	2010-09-21 - 11:23	LarsEklund
png	Mix2_Bd2KplusPiminus_pull.png	r1	manage	22.1 K	2010-09-21 - 11:23	LarsEklund
png	Mix2_Bd2PiPi_pull.png	r1	manage	20.3 K	2010-09-21 - 11:23	LarsEklund
png	Mix2_Bs2KK_pull.png	r1	manage	20.9 K	2010-09-21 - 12:41	LarsEklund
png	Mix3_Bd2KminusPiplus_pull.png	r1	manage	21.9 K	2010-09-21 - 13:00	LarsEklund
png	Mix3_Bd2KplusPiminus_pull.png	r1	manage	21.5 K	2010-09-21 - 13:00	LarsEklund
png	Mix3_Bd2PiPi_pull.png	r1	manage	21.1 K	2010-09-21 - 13:00	LarsEklund
png	Mix3_Bs2KK_pull.png	r1	manage	22.2 K	2010-09-21 - 13:01	LarsEklund
png	Mix3_Bs2KminusPiplus_pull.png	r1	manage	22.7 K	2010-09-21 - 13:01	LarsEklund
png	Mix3_Bs2KplusPiminus_pull.png	r1	manage	21.9 K	2010-09-21 - 13:01	LarsEklund
gif	c1.gif	r1	manage	7.7 K	2010-08-16 - 14:27	AlisonBates
png	mcEventClasses.png	r1	manage	20.1 K	2010-08-10 - 08:14	LarsEklund
png	mcEventRatios.png	r1	manage	14.4 K	2010-08-10 - 08:14	LarsEklund

Topic revision: r7 - 2010-09-21 - LarsEklund

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