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Electroweak penguin decays of B mesons
Proceedings of ICHEP 2002, pp. 598–601 S. Bentvelsen, P. de Jong, J. Koch and E. Laenen (Editors)
ELSEVIER
31st INTERNATIONAL CONFERENCE ON HIGH ENERGY PHYSICS AMSTERDAM
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c 2003 Elsevier Science B.V. All rights reserved. doi:10.1016/S0920-5632(02)02195-3
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Electroweak penguin decays of B mesons
599
1
Æ
! " ## $% &!
2
! ! 3 ! * 4/ ! 4/ 2 %(#! %(#! 0 '
+ −
80
+
(a) K π γ
(b) KSπ γ
Yield 351 ± 21 ± 5
Yield 119 ± 12 ± 1
fit result total b.g.
60
30
fit result total b.g.
20
40
2
0 15
Entries/(MeV/c )
2
Entries/(MeV/c )
10 20
+ 0
0 4
0
(c) K π γ
(d) KSπ γ
Yield 61 ± 9 ± 1
Yield 11 ± 4 ± 0.5
fit result total b.g.
10
3
fit result total b.g.
2
0 6
5
0 5.2
3 5
1 0 5.22
5.24
5.26
5.28
5.2
5.22
5.24
5.26
5.28
2
Beam constrained mass (GeV/c )
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ρ γ
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ωγ
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5
0 5.2
5.22
5.24
5.26
5.28
2
5 0
-0.2
0
10
0.2
0.4
∆E (GeV) +
ρ γ
7.5
5 2.5 0
-0.2
0
10
0.2
0.4
∆E (GeV)
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0
0.2
0.4
∆E (GeV)
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ωγ
7.5
0
£
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0
ργ
10
2
Mbc (GeV/c )
Events/8 MeV
0 5.2
15
events / 2.5 MeV
Events/8 MeV
0
ργ
10
Mbc (GeV/c )
S. Nishida
Events/8 MeV
Events/0.9 MeV
Events/0.9 MeV
Events/0.9 MeV
600
6
* + -
+ -
(a) K e e
8
(b) K e e
6
4
4 2 2 0
0 8
+ -
8
(c) K µ µ
*
+ -
(d) K µ µ
6
6 4
4
2
2
0
0
* +-
+-
(e) K l l
10
(f) K l l
10 5
5
0 5.2
5.225 5.25 5.275
5.3
0 5.2
5.225 5.25 5.275
5.3
2
Mbc (GeV/c )
£
1 1
$9&
Electroweak penguin decays of B mesons
601
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£ £
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" "
% & ( " $" "
+ -
40
(a) Xse e
# ( % ) ) ) & ( %
+ -
(b) Xsµ µ
30 20
2
Entries / (2.5 MeV/c )
+ 1 2 # ! 1 ! ! # * 3
45 " 45 # ! ! ! 60 # * ¼ ! $ # ! !+ / # # * , # * 7 ! 0!, , # ! ! # ! ! ! ! # 8! ! ! 6 ! , 0 + ! . ! 9':#
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(c) Xsl l
+ -
(d) Xse µ + c.c.
60 40 20 0 5.2 5.22 5.24 5.26 5.28 5.2 5.22 5.24 5.26 5.28 2 Mbc (GeV/c )
/ # ? #
#
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ELSEVIER
31st INTERNATIONAL CONFERENCE ON HIGH ENERGY PHYSICS AMSTERDAM
! " # $ $ $ % & &' ! &(
! " # # $ % ! &'" & % & %
& ( # $ ) )
*) % +, # !- . /0 1 /0" 2!3 " % )
& # +4, &
6 5.
!174"
' !174" & # &
8# 9 &#
&% # : ; & & # ' & ( % # Ë Ë # ! " <. 0
c 2003 Elsevier Science B.V. All rights reserved. doi:10.1016/S0920-5632(02)02195-3
& $ 6 ! = " & % ! 6 " & $ # $
!>?" @( ! " 8 @(
@ ' A @'%( +-, B & & :
! :" ' & A & ! " & % C &
# @ Æ
& !-34D13"E !34D-."E !43DD43"E !D57 DD1"E # & & % &
" = !34 -. -" D !
!
" = !-7 4- 4." D
( A A 9 &# %
!174"
A =
6 ! 6 4 !
6 " F !
6 " F !
"
"
# # ! " ! 6 6
; % " # & D7E
¾
Electroweak penguin decays of B mesons
599
1
Æ
! " ## $% &!
2
! ! 3 ! * 4/ ! 4/ 2 %(#! %(#! 0 '
+ −
80
+
(a) K π γ
(b) KSπ γ
Yield 351 ± 21 ± 5
Yield 119 ± 12 ± 1
fit result total b.g.
60
30
fit result total b.g.
20
40
2
0 15
Entries/(MeV/c )
2
Entries/(MeV/c )
10 20
+ 0
0 4
0
(c) K π γ
(d) KSπ γ
Yield 61 ± 9 ± 1
Yield 11 ± 4 ± 0.5
fit result total b.g.
10
3
fit result total b.g.
2
0 6
5
0 5.2
3 5
1 0 5.22
5.24
5.26
5.28
5.2
5.22
5.24
5.26
5.28
2
Beam constrained mass (GeV/c )
'
%(#!
$)*! + ,$- ' ! " $ ./ 0
! ! $)*!
! * #$ ! * $)*! ! " '
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5
5.22
5.24
5.26
5.28
10
+
ρ γ
7.5 5 2.5 0 5.2
5.22
5.24
5.26
5.28
Mbc (GeV/c2)
ωγ
10
5
0 5.2
5.22
5.24
5.26
5.28
2
5 0
-0.2
0
10
0.2
0.4
∆E (GeV) +
ρ γ
7.5
5 2.5 0
-0.2
0
10
0.2
0.4
∆E (GeV)
5 2.5 -0.2
0
0.2
0.4
∆E (GeV)
£ ! " £ £ Ë Ë # $%&
£ ' ( ) *+ ,- . / 0 1 ¼ " £ 2 ¼ " 3 . 4# . 1 3 1
" . 1 1 4#
5 1 '
ωγ
7.5
0
£
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0
ργ
10
2
Mbc (GeV/c )
Events/8 MeV
0 5.2
15
events / 2.5 MeV
Events/8 MeV
0
ργ
10
Mbc (GeV/c )
S. Nishida
Events/8 MeV
Events/0.9 MeV
Events/0.9 MeV
Events/0.9 MeV
600
6
* + -
+ -
(a) K e e
8
(b) K e e
6
4
4 2 2 0
0 8
+ -
8
(c) K µ µ
*
+ -
(d) K µ µ
6
6 4
4
2
2
0
0
* +-
+-
(e) K l l
10
(f) K l l
10 5
5
0 5.2
5.225 5.25 5.275
5.3
0 5.2
5.225 5.25 5.275
5.3
2
Mbc (GeV/c )
£
1 1
$9&
Electroweak penguin decays of B mesons
601
Æ ! "
£ £
$" "&
" % & ' & $ "" &( "
$ "
# * ! + ! +! ! + # , - - ./* / ! 0
"# ;<;= = / > 1 ;<; 10 %0" "% ! # # 8# 8 ! = ? @ # A # !# ""( # &# ;# 8 = ? B! # # "%" " #
" "
% & ( " $" "
+ -
40
(a) Xse e
# ( % ) ) ) & ( %
+ -
(b) Xsµ µ
30 20
2
Entries / (2.5 MeV/c )
+ 1 2 # ! 1 ! ! # * 3
45 " 45 # ! ! ! 60 # * ¼ ! $ # ! !+ / # # * , # * 7 ! 0!, , # ! ! # ! ! ! ! # 8! ! ! 6 ! , 0 + ! . ! 9':#
" &' $ ' ' %' $
Æ "% " " "" "% "" $ % $% ( %& % & % &$ &( %
10 0 +-
(c) Xsl l
+ -
(d) Xse µ + c.c.
60 40 20 0 5.2 5.22 5.24 5.26 5.28 5.2 5.22 5.24 5.26 5.28 2 Mbc (GeV/c )
/ # ? #
#
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