Golob University of Ljubljana Jožef Stefan Institute amp BelleBelle II Collaboration The Belle II Project University of Ljubljana Jožef Stefan Institute Epiphany Conference ID: 464376
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Slide1
Boštjan
Golob
University of Ljubljana/
Jožef
Stefan Institute & Belle/Belle II Collaboration
The
Belle
II Project
University
of Ljubljana
“Jožef Stefan”
Institute
Epiphany Conference
,
Cracow, January 2012
Introduction
PID
AcceleratorCalorimeterVertexGeneral
Introduction
Accelerator
Detector
Vertex
physics example
PID
physics example
Calorimeter
physics example
General requirementsSlide2
Introduction
Quest for NP...
....consists of energy frontier
direct observation of new particles &
processes using highest achievable energies
intensity frontier indirect observation of
NP effects on (rare) known processes
(cosmic frontier)
Introduction
PID
Accelerator
Calorimeter
Vertex
General
bližina otoka Veli Drvenik, sept. 2011
Intensity frontier
Energy frontierSlide3
Introduction
Quest for NP
LHC at the energy frontier
V. Sharma, LP11 conference
95% C.L. exclusion limits in mass
SUSY plane
H. Bachacou, LP11 conference
95% C.L. exclusion limits on MSSM A
0
1 TeV
SUSY in the simplest forms
seems to be excluded
Introduction
PID
Accelerator
Calorimeter
VertexGeneralSlide4
Introduction
Quest for NP
B factories, LHCb, ... at the intensity frontier
B mesons sector
D mesons sector
b
=
CKM Fitter, Summer 2011
HFAG, December 2011
Hints of deviations from SM at few
s
level
Introduction
PID
Accelerator
Calorimeter
Vertex
Generaldirect measurementindirect determinationSlide5
Introduction
Quest for NP
Intensity frontier requirements for future facilities (quark sector)
s
1/
N
O(102) higher luminosity
complementarity to other intensity frontiers experiments (LHCb, BES III, ....); accurate theoretical predictions to compare to
NP flavor violating
couplings(
1 in MFV)
NP reach in terms
of mass
Terra Incognita
Illustrative reach of NP searches
Introduction
PID
Accelerator
Calorimeter
Vertex
GeneralSlide6
Introduction
Accelerator
“
B-Factory”,
KEKB @ KEK
KEKB:
e
-
(HER): 8.0
GeV
e
+ (LER): 3.5 GeVcrossing angle:
22 mrad
ECMS=M(U(4S))c
2dNf/dt = s(e
+e-→f)
L
Tokyo (40 mins by Tsukuba Exps)BelleHERLER Ldt = 1020 fb-12010
1999
accelerator
institute
e
-
e
+
(1.02 ab
-1
)
Introduction
PID
Accelerator
Calorimeter
Vertex
GeneralSlide7
Introduction
s
(
e
+
e
-
→
c c) 1.3 nb (~1.3x10
9 X
cY
c pairs)
”continuum” production
“on resonance” productione+e-
→ U
(4S) → B
d0Bd0, B+B- s(e+e- → BB) 1.1 nb (~109 BB pairs)
Belle
L
dt
1020 fb
-1
Accelerator
“
B-Factory”,
KEKB
@
, KEK
s
(e
+
e
-
→hadroni) [nb]
b
b
u,d
b
b
u,d
U
(4S)
B
d
0
, B
+
B
d
0
, B
-
energ
. threshold
for
BB
production
g
*
c
c
e
-
e
+
hadrons
hadrons
Introduction
PID
Accelerator
Calorimeter
Vertex
General
running at
Y(nS)
, e.g.
Y(5S)
(
B
s
B
s
)Slide8
Accelerator
Super
KEKB
s
x
~100
m
m,
sy~2mm
sx~10mm,
sy~60
nm
e
-
e+Nano beams design(P. Raimondi)
small b
y*large xy (by*/ey) small eyhourglass effect small bx*increase Ib
*: beta-function (trajectories
envelope) at
IP
x
y
: b
eam-beam parameter
L
[s
-1
cm
-2
]
∫L
dt
[ab
-1
]
design
L
=8·10
35
s
-1
cm
-2
current B factories
∫L
dt=10 ab
-1
(2018)
∫L
dt=50 ab
-1
(2022)
Introduction
PID
Accelerator
Calorimeter
Vertex
General
KEKB
SuperKEKBSlide9
Accelerator
Damping ring
Low emittance gun
Positron source
New beam pipe
& bellows
Belle II
New IR
TiN
-coated beam pipe with antechambers
Redesign the lattices of HER & LER to squeeze the
emittance
Add / modify RF systems for higher beam current
New positron target / capture section
New superconducting /permanent final focusing quads near
the
IP
Low
emittance
electrons to inject
Low
emittance
positrons to inject
Replace short dipoles with longer ones (LER)
Super KEKB
e
+
e
-
Introduction
PID
Accelerator
Calorimeter
Vertex
GeneralSlide10
Detector
CsI(Tl) EM calorimeter:
waveform sampling
electronics, pure CsI for end-caps
4 layers DSSD
→
2 layers PXD
(DEPFET) +
4 layers DSSD
Central Drift Chamber:
smaller cell size,
long lever arm
7.4 m
7.1 m
Time-of-Flight, Aerogel
Cherenkov Counter
→
Time-of-Propagation counter (barrel), prox. focusing Aerogel RICH (forward)RPC m & KL counter: scintillator + Si-PM for end-caps
1.5 m
3.3 m
Belle II
Introduction
PID
Accelerator
Calorimeter
Vertex
GeneralSlide11
Vertex detector
PXD+SVD Belle II
r [cm]
SVD Belle
z [cm]
sBelle Design Group, KEK Report 2008-7
DSSD’s
pixels
z [cm]
DEPFET matrix
DCDB
R/O chip
Switcher control chip
prototype DEPFET
sensor
DEPFET mockup
Si Vertex Det.
Belle
Belle II
10
m
m
20
m
m
z impact parameter
resolution
p
b
*
sin
5/2
(
q
) [GeV/c]
Introduction
PID
Accelerator
Calorimeter
Vertex
GeneralSlide12
t-dependent CPV
B → K
* (→KS
p0)
g t-dependent CPV
SM: SCP
K*g
-(
2ms/mb
)sin2f1 -0.04Left-Right Symmetric Models: SCP
K*g 0.67 cos2
f1 0.5
SCPKsp
0g = -0.15 ±0.20 A
CPKsp0g
= -0.07 ±0.12 HFAG, Summer’11
(~SM prediction)
D. Atwood et al., PRL79, 185 (1997)
B. Grinstein et al., PRD71, 011504 (2005)s(SCPKsp0g)= 0.09 @ 5 ab-1 0.03 @ 50 ab-1
t-dependent decays rate of
B → f
CP
;
S
and
A
: CP violating parameters
5 ab
-1
50 ab
-1
Introduction
PID
Accelerator
Calorimeter
Vertex
GeneralSlide13
Proximity focusing Aerogel RICH
(endcap)
PID
Time Of Propagation counter (barrel)
partial Cerenkov ring reconstruction
from x, y and t of propagation
prototype quartz bar
Hamamatsu
16ch MCP-PMT
Aerogel radiator
Hamamatsu
HAPD
Cherenkov photon
200mm
n~1.05
Hamamatsu
HAPD
Aerogel
Introduction
PID
Accelerator
Calorimeter
Vertex
General
x
ySlide14
Direct CPV
DCPV puzzle:
tree+penguin processes,
B+(0)
→K+
p0(-)
DA
Kp=
A(K+
p -)- A(K+p 0)= -0.1
27±0.022
model independent sum rule:
A(K
0
p+)=0.009 ±0.025A(K+
p0)=0.050 ±0.025A(K+p-)=-0.098 ±0.012A(K0p
0)=-0.01 ±0.10
M. Gronau, PLB627, 82 (2005);
D. Atwood, A. Soni, PRD58, 036005 (1998)HFAG, Summer’11Belle II 50 ab-1A(K0p0)A(K0p+)sum rule
d
A(K
+
p
0
)
measured
(HFAG)
expected
(sum rule)
Belle, Nature 452, 332 (2008), 480 fb
-1
misidentif.
bkg.
B
0
→K
+
p
-
Introduction
PID
Accelerator
Calorimeter
Vertex
General
P. Chang
,
EPS
’
11Slide15
EM Calorimeter
ECL (barrel):
new electronics with2MHz w
ave form sampling
ECL (endcap):
pure CsI crystals;(may be staged)
faster performance and better rad. hardness than Tl doped CsI
t
ECL
signal
t
ECL
signal
amplitude
time sampling
2x improved
s
at 20x bkg.
Introduction
PID
Accelerator
Calorimeter
Vertex
General
trigger
trigger
off-time
bkg.
signalSlide16
E
miss
measurements
B
tn,
hnn
, ...
fully (partially) reconstruct B
tag;reconstruct h from Bsig→hnn
or t(→
hn)n;
no additional energy in EM calorim.; signal at EECL
~0;Btag
full reconstruction:NeuroBayes;TOP detector;ECL, increased background
;Example of B hnn measurement:
Missing E
(
n
)
B
sig
→
tn
candidate
event
B
sig
B
tag
--
exp. signal (20xBr)
exp. bkg. (scaled to sideband)
Belle, PRL99, 221802 (2007), 490 fb
-1
hadr. tag
signal
region
Introduction
PID
Accelerator
Calorimeter
Vertex
General
B
(B
0
→
K*
0
nn
) < 3.4 ·10
-4
@ 90% C.L.Slide17
E
miss
measurements
B
hn
n
B
sigBtag (hnn)(X
ln) semil. tag
(
hnn)(X) hadr. tag
B
(B+ K(
*)+nn) can be measured to ±30% with 50 ab-1
;limits on right-handed
currents
W. Altmannshofer et al., arXiv:0902.0160
SM
Introduction
PID
Accelerator
Calorimeter
Vertex
GeneralSlide18
SuperKEKB requirements
O(10
2) higher luminosity
SuperKEKB will deliver 50 ab-1
complementarity to other intensity frontiers
experiments (LHCb, BES III, ....);
accurate theoretical predictions to compare to
∫L
dt[ab-1
]
current B factories
∫L
dt=50 ab
-1 (2022)
2010 2012 2014 2016 2018 2020 2022
Introduction
PID
AcceleratorCalorimeterVertexGeneralSlide19
SuperKEKB requirements
O
(102) higher luminosity
complementarity to other intensity frontiers experiments (LHCb, BES III, ....);
accurate theoretical predictions to compare to
G. Isidori
et al.,
Ann.Rev.Nucl.Part.Sci.
60, 355 (2010)
Super B factory
LHCb
K experiments
Introduction
PID
Accelerator
Calorimeter
Vertex
General
B
(B
→
X
s
g
) 6% Super-B
B
(B
→
X
d
g
) 20% Super-B
S(B
→
rg
) 0.15 Super-B
B
(
t
→
mg
)
3
·
10
-9
Super-B (90% U.L.)
B
(B
+
→
D
tn
) 3% Super-B
B
(B
s
→
gg
)
0.25
·
10
-6
Super-B (5 ab
-1
)
sin
2
q
W
@
U
(4S)
3
·
10
-4
Super-B Slide20
SuperKEKB requirements
Introduction
PID
Accelerator
Calorimeter
Vertex
General
Methods and processes where Super B factory can provide
important insight into NP
complementary to other experiments
:
(shown are expected sensitivities @ 50 ab
-1
)
Emiss:
B(B→ tn), B(B →
Xctn),
B(B
→ hnn),... ±3% ±3% ±30%Inclusive: B(B → sg), ACP(B → sg), B(B → sll ), ... ±6% ±5 ·10-3
±
1
·
10
-7
Neutrals:
S
(
B
→
K
S
p
0
g
),
S
(
B
→
h
’ K
S
),
S
(
B
→
K
S
K
S
K
S
),
B
(
t
→
mg
),
B
(
B
s
→
gg
), ...
±
0.03
±
0.02
±
0.03
±
3
·
10
-9
±
3
·
10
-7
Detailed description of physics program at Super B factories at:
A.G. Akeroyd et al., arXiv: 1002.5012
B. O’Leary et al., arXiv: 1008.1541Slide21
SuperKEKB requirements
A.G.
Akeroyd
et al.,
arXiv:1002.5012
contours of S(K
S
p
0
g
)
Example of complementarity:
MSSM searches
Belle II
constraints shown @ 5 ab
-1
LHCb
: Br(B
s
m
+
m
-
)~
(4-5)
x10
-9
(
@ 3 fb
-1
)
S(K
S
p
0
g
) ~ -0.4
±
0.1
S(K
S
p
0
g
) ~ 0.1
±
0.1
Belle II/
LHCb
combination
:
stringent limits on Re(
d
d
RL
)
23
,
tan
b
tan
b
Re(
d
d
RL
)
23
Introduction
PID
Accelerator
Calorimeter
Vertex
GeneralSlide22
SuperKEKB requirements
O
(102) higher luminosity
complementarity to other intensity frontiers
experiments (LHCb, BES III, ....);
accurate theoretical predictions to compare to
G. Isidori
et al.,
Ann.Rev.Nucl.Part.Sci. 60, 355 (2010)
theory uncertainty
matches the expected
exp. precision
theory uncertainty will
match the expected
exp. precision with
expected progress in
LQCD
Introduction
PID
Accelerator
Calorimeter
Vertex
GeneralSlide23
Summary
Introduction
PID
Accelerator
Calorimeter
Vertex
General
The SuperKEKB and Belle II project approved
by the Japanese government
Truly int. coll. with strong European participation
Groundbreaking ceremony in November last
year
Both accelerator upgrade and detector
re-building are well on track
SuperKEKB will provide 50 ab
-1 by 2022, Belle II detector with equal or better performance than Belle under higher backgrounds Next collaboration meeting: March 2012, open to everyone