Background components                                                                        Kenji Hamano

Last modified : Feb 21, 2007                                              Back to Home Back to privious page

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UncorrDL (Uncorrelated Direct Lepton)

lepton directly come fom B and lepton and B come from different B

Possible processes are
1) B -> Dbar l+ nu : this l+
   Bbar -> D Dbar X : this Dbar

2) B -> Dbar l+ nu : this l+
   Bbar -> D X , D -> K+ Pi- (doubly Cabbibo suppressed decay) : this K+ Pi- is mis-reconstructed as Dbar

3) B0 -> D- l+ nu : this l+
   B0bar -> B0 -> D- l+ nu : this D-
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	BpBm		B0B0bar
	D0	D+	D0	D+
Total	9624	7541	17519	17566
DDX decay	9108 (94.6 %)	7241 (96.0 %)	9786 (55.9 %)	6072 (34.6 %)
Doubly Cabbibo suppressed	155 (1.6 %)	0	92 (0.5 %)	0
B0B0bar mxing	0	0	7352 (42.0 %)	11177 (63.6 %)
Details	BpBm		B0B0
D+ from B+ (D- from B-)	2139 (35.8 %)		n/a
D+ from B- (D- from B+)	169 (2.8 %)		n/a
D0 from B+ (D0bar from B-)	2814 (47.0 %)		n/a
D0 from B- (D0bar from B+)	860 (14.4 %)		n/a
D+ from B0 (D- from B0bar)	n/a		1692 (15.9 %)
D+ from B0bar (D- from B0)	n/a		3786 (35.5 %)
D0 from B0 (D0bar from B0bar)	n/a		2746 (25.8 %)
D0 from B0bar (D0bar from B0)	n/a		2428 (22.8 %)
Details	BpBm	B0B0

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UncorrCL (Uncorrelated Cascade Lepton)

lepton come fom non-B and lepton and B come from different B

Possible processes are
1)B -> Dbar X : this Dbar
   B -> D X, D -> X l+ nu : this l+

	BpBm		B0B0bar
	D0	D+	D0	D+
Total	11883	3728	9417	13374
l from Gamma	494 (4.2 %)	164 (4.4 %)	284 (3.0 %)	377 (2.8 %)
l from tau	339 (2.9 %)	231 (6.2 %)	598 (6.4 %)	965 (7.2 %)
l from uds	348 (2.9 %)	128 (3.4 %)	244 (2.6 %)	-15 (0 %)
l from D	10442 (87.9 %)	3120 (83.7 %)	8126 (86.3 %)	11821 (88.4 %)
B->DDX->l	3073 (29.4 %)	1513 (48.5 %)	2989 (36.8 %)	3567 (45.4 %)
DCSD	23	0	7	0
B0B0bar mxing	0	0	911 (24.0 %)	1071 (11.4 %)
Details		BpBm		B0B0
D+ from B+ (D- from B-)		151 (3.4 %)	n/a
D+ from B- (D- from B+)		922 (20.5 %)	n/a
D0 from B+ (D0bar from B-)		196 (4.4 %)	n/a
D0 from B- (D0bar from B+)		3229 (71.8 %)	n/a
D+ from B0 (D- from B0bar)		n/a	166 (2.7 %)
D+ from B0bar (D- from B0)		n/a	3528 (56.4 %)
D0 from B0 (D0bar from B0bar)		n/a	291 (4.6 %)
D0 from B0bar (D0bar from B0)		n/a	2275 (36.3 %)
Details	BpBm		B0B0

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CascL (Correlated Cascade Lepton)

lepton come fom non-B and lepton and B come from same B

Possible processes are
1) B -> D Dbar : this Dbar
   D -> X l+ nu : this l+

	BpBm		B0B0bar
	D0	D+	D0	D+
l from Gamma	299 (4.0 %)	64 (2.6 %)	123 (2.3 %)	293 (4.3 %)
l from tau	3624 (49.8 %)	730 (30.2 %)	2251 (42.0 %)	3000 (44.1 %)
l from uds	390 (5.3 %)	139 (5.7 %)	184 (3.4 %)	354 (5.2 %)
l from D	3114 (41.9 %)	1488 (61.5 %)	2799 (52.2 %)	3174 (46.7 %)
B->DDX decay	3111 (100 %)	1487 (100 %)	2794 (99.8 %)	3164 (99.7 %)
Details	BpBm		B0B0

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FakeL (Fake Lepton with Real D)

Hadrons such as pi, K, p are mis-identified as a lepton (e or mu).

	BpBm MC	B0B0bar MC
Total	1923 (1939)	2033 (2046)
pi	1771 (92.1 %)	1828 (89.9 %)
K	147 (7.6 %)	190 (9.4 %)
Other	5 (0.3 %)	15 (0.7 %)
Details	BpBm	B0B0
D+ from B+ (D- from B-)	80 (4.1 %)	n/a
D+ from B- (D- from B+)	466 (24.0 %)	n/a
D0 from B+ (D0bar from B-)	154 (7.9 %)	n/a
D0 from B- (D0bar from B+)	1239 (63.9 %)	n/a
D+ from B0 (D- from B0bar)	n/a	73 (3.6 %)
D+ from B0bar (D- from B0)	n/a	1156 (56.5 %)
D0 from B0 (D0bar from B0bar)	n/a	116 (5.7 %)
D0 from B0bar (D0bar from B0)	n/a	701 (34.3 %)
Details	BpBm	B0B0

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