Status of Belle II and Physics Prospects · Status of Belle II and Physics Prospects Ryosuke Itoh,...
Transcript of Status of Belle II and Physics Prospects · Status of Belle II and Physics Prospects Ryosuke Itoh,...
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1R.Itoh, FPCapri2016
Status of Belle IIand
Physics Prospects
Ryosuke Itoh, KEK
Capri2016, June 13, 2016
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Overview
1. Introduction
2. Status of SuperKEKB and Belle II
3. Prospects for Physics at Belle II – based on the discussion in B2TIP
4. Summary
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1. Introduction
- Up to now, there is no symptom of New Physics(NP) observed in ATLAS/CMS experiments. There is a possibility that the scale of NP is even more than 10 TeV, which is out of reach by them.
- The indirect search for NP at Belle II, a new generation B-factory where the search region can be extended to more than O(10TeV), will be more important.
- However, the effect of NP in the indirect processes is expected to be tiny, and a clear signature has not yet been observed by Belle/BaBar/LHCb so far.
- To go beyond, more precise measurements in much higher statistics of events in a clean environment is required.
KEKB/Belle upgrade to achieve > x40 higher luminosity.
SuperKEKB/Belle II=
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2. Status of SuperKEKB and Belle IIBelle II Schedule
- The operation of SuperKEKB accelerator has been started from the beginning of this year although the beams are not yet collided.
- “BEAST” detector is now implemented in the IP to monitor the background level
June 7, 2016 (LER beam current at 845 mA, HER at 780 mA)
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5R.Itoh, FPCapri2016Collision commisioning is scheduled in “Phase II” run.
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BEAST operation snapshot
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LER integrated beam dose > 100 A-h
BEAST background in the LER vs time
BEAST data shows the LER backgrounds decreasing as vacuum scrubbing proceeds.
Vacuum scrubbing is going on to reduce the background causedby the beam gas.
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Europe 262
Austria 13
Czech 6
Germany 96
Italy 69
Poland 12
Russia 44
Slovenia 18
Spain 2
Ukraine 2
America 111
Canada 26
Mexico 10
USA 75
23countries/regions98 institutions~700 researchers
Belle II Collaboration
Asia 313
Saudi Arabia 5
Australia 26
China 22
India 33
Japan 156
Korea 37
Malaysia 7
Vietnam 4
Taiwan 20
Thailand 1
Turkey 2
As of Feb. 2016
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The Belle II detector
- High granularity “pixelized” sensors to be tolerable for high rate * Improved vertex detector with DEPFET Pixel sensors + DSSD * Improved particle ID devices (TOP, ARICH)- High bandwidth DAQ (>30GB/sec data flow @30kHz, >1MB/event)
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Vertex Detector : Pixel detector + Silicon strip detector
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Particle ID : TOP + ARICH
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TOP detector at Tsukuba Hall
12
Update: May 20, 2016 all 16 TOP modules were installed into the Belle II structure. Magnetic field mapping then CDC installation in the summer.
First TOP module arriving at Tsukuba Hall
CDC (Central Drift Chamber)
May 2016: Belle II structure
Outer detectors (ECL and KLM) were already installed.
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FEdig
FEdig
FEdig
FEdig
FEdig
tx
tx
tx
tx
tx
rx
rx
rx
rx
R/OPC
R/OPC
R/OPC
R/OPC
Event B
uilder 1
~300 COPPERs~0.5M chan.
HLT farms~O(10) units of~400 cores/unit
~30 R/O PCs
Near detector E-hut DAQ server room
Rocket IOover fiber
CDC
SVD
PID
ECL
KLM
Event B
uilder 2
PXD FEdig PXD readout box
HLT distributor
recorder
recorder
recorder
recorder
RAID~10 units
......
.....
DATCON
Belle II DAQ
Belle2link
ExpressReco
Feed back toPXD R/O
30kHz100kB/ev
10kHz200kB/ev
30kHz1MB/ev
10kHz100kB/ev
10kHz300kB/ev= 3GB/s
1/3 ratereduction
1/10 sizereduction
Online Storage
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Test full-sized PXD modules in a beam. [Measure efficiency and S/N].
Test the integrated PXD-SVD system. This includes ROI (region of interest) extrapolation from the SVD tracker to the PXD, which is needed to reduce the large data volume.
Working examples of L3, L4, L5, L6 SVD ladders
Beam tests of PXD+SVD+DAQ at DESY (Jan 2014 and Apr 2016)
- Test of full tracking performance of SVD+PXD- The PXD data reduction by RoI feedback using reconstructed tracks by SVD.
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Real time PXD hit map
Real time RoI selection
2 PXD sensors
RoIs obtained from tracks
track reconstructedby HLT
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3. Physics Prospects
- The physics strategy at Belle II is being discussed in B2TIP (Belle II Theory Interface Platform).
- It is a joint effort of both theorists and experimentalists to have a close communication.
- The activity was started in 2014 aiming at delivering a full report by early 2017.
- We had 4 dedicated + 3 satellite workshops until now.
- The last workshop was held in Pittsburgh in May 23-26.
- I will show some of the discussion summary as our prospects for Belle II physics.
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4th B2TIP Workshop in Pittsburgh
Univ. of Pittsburgh
May 23-25, 2016
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B2TIP goal : to clarify possible physics targets with a luminosity of 1, 10 and 50 ab-1
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a) Pure leptonic decay of B meson
SM :
δ(Br) ~ 5% @ 50ab⁻¹(Hadron Tag only) ~ 3% (with SL tag)
Prospect in Belle II
HFAG14
WG1: Leptonic B decays
Br(Btn)SM
= (1.11±0.28)10-4
Br(Btn) = (1.14±0.22)10-4
(2HDM)
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b) BD(*)tn- World Average is shifted 4.0s from SM prediction!
New approach to useBptn is under discussion
with Belle: arXiv:1603.06711
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SM
0.5 GeV−1
1.0 GeV−1
0.3 GeV−1
BaBar
Belle
tanβ/mH
Measurements: - Values change for different tanβ/mH due to different missing mass distr.
inconsistent
2HDM Type II predictions
LHCbhad. tagSL tag
Latest analysis results
PRL109, 101802; PRD 88, 072012
arXiv:1603.06711 PRD 92, 072014
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bb→ssγR: right handed photon b→sγL: left handed photon
b
s
mm
S2
φ2sin 1SM
a) CPV in B⁰→K⁰Sπ⁰γ (b→sγ)
SM:
WG2: Radiative and Electroweak Penguins
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b) BXsll* Study of inclusive BXsll is one of the key measurements at Belle II to understand the LHCb “anomaly” in BK*ll.* The detailed angular analysis is supposed to be performed.* “Pure inclusive” might be a bit difficult -> “semi-inclusive” like Belle. <- “Full-recon” tag could be used, but low statistics even with 50ab-1
T.Huber, T.Hurth, E.Lunghi,JHEP 1506, 176 (2015)
HT
R10
R9
R10
R9
R10
R9
HL
HA Sensitivity
with50/ab
Belle: PRD 93, 032008 (2016)
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c) EW penguin with neutrinos
* Sensitive to NP and theoretically very clean* Could be a hint to lepton universality breakdown? by the comparison with K(*)l+l-
+ NP?
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bb→cc ss tree diagram bb→sqqs loop diagram
019.0682.0φ2sin
03.064.0φ2sin
W.A1
W.A1
scc
qsq
CPV in bs transition possible contribution ofnew particle
* Deviation ~0.8s
d(sin21 (sqq))=
~1.2%@50ab-1
SM predicts the same valueat a precision of ~1%.
Current measurement
Prospect in Belle II (combined)
c
* Some of systematics are cancelled by taking the difference between measurements for ccs and sqq.
~
WG3: 1 and
2
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CP Violation in D0-D0 mixing
SM (+NP):
+
Long distance
HFAG2013 Belle II 50ab-1
WG6: Charm
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Lepton Flavor Violation (LFV) : tmg, tmmm
Theoretically very clean test of Standard Model
SM: NP:
Br ~ 10-25
Prospect in Belle II < ~10-9 (tmg) < ~10-10 (tmmm)
WG8 : Tau, low multiplicity and EW
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“Dark photon” search
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WGNP (WG9) : New Physics- Study of sensitivity to NP by combining Belle II measurements
a) Precision constraint on CKM triangle
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b) Constraint on Charged Higgs
3σ
Excl. at2σ
5σ
BtnNow (Belle+BaBar) 2HDM (Type II)
Btn BD(*)tn bsg (Note: based on Belle only results)
NP-Japan
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c) Discussion on Theory code
- Currently we are evaluatinga) SuperIsob) EOSc) HEPfitd) FormFlavor
- For the detailed study of NP effects in the experiment, the NP effect has to be simulated in various measurements by Monte Carlo.
- Computer coded NP theories are essential tools to be implemented in MC.
EOS used in the test of global fitto have constraints on Wilson Coeff.
AFB
(B->Xsll)
AFB
(B->Xsll) +K*ll: A
FB+F
L +
Br(b->sg)
Toy Plot
Toy Plot
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34
Competitiveness to LHCb
1.5o
0.02
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4. Summary
- The operation of SuperKEKB has been started and the machine is being tuned for the start of physics data taking in 2018.
- The Belle II detector construction is in a good shape.
- The physics program of Belle II is now being discussed in B2TIP framework aiming at the early discovery of New Physics.
- We need more closer collaboration with theorists to enrich the physics program at Belle II.
- Your participation is very much welcome!
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Backup Slides
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The SuperKEKB accelerator
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“Full sized” pixel detector module 0
38
75 μm thick
Pixel detector group from many institutes and universities in Germany, also Czech Republic and Spain.
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Innner detector structure (SVD+PXD)
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DAQ for DESY beam test
COPPER
COPPER
FTB
FTSW ttdcpu
DHP DHE DHC Onsen
R/OPC1 hltin
hltctl
hltwn1 hltwn2 hltwn3
hltout
R/OPC2
ExpReco
Eventdisplay
FTB
FADC
FADC
TLU
switch
switch
SVD4 layers
PXDOB
4 scinti.
coincidence
POCKET DAQ
HLT
HLT RoI
PXD R/O
DATCON RoI
EVB2Storage
ExpressReco
merged in offline
Belle2link
“Pocket TTD”
“Full functionality of Belle II DAQ”
DATCON
DHP DHE DHC
PXDIB
DQM server
Histobrowserr
DQM histos
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Event reconstruction using “FullRecon” at B-factory
- The central technique : full reconstruction of tag-side B meson decay
- reconstructed from * Hadronic tag: hadronic decays: BD(*)p etc, eff. ~ 0.2%, purity ~20% * SL tag: semi-leptonic decays : BD(*)ln eff. ~1.5%, more BG.
D(*)
Kπ
π’sBtag
, etc.
Υ(4S)τ
ν’s μ, e, π, etc.
ν Bsig
tag side B signalside B
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43R.Itoh, FPCapri2016
WG1: Other Exclusive decays
- Precision measurements of CKM matrix elements.
* Not so much gain.* Important to study the difference between inclusive and exclusive measurements.
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44R.Itoh, FPCapri2016
BXsll
Another example of sensitivity estimation:
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45R.Itoh, FPCapri2016
WG4 : 3
- LHCb dominates, though.- There could be a new idea on the measurement.
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46R.Itoh, FPCapri2016
WG5 : Charmless hadronic decays
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47R.Itoh, FPCapri2016
WG7: Exotic Particles
S.Godfrey
B.Fulsom's slide in B2TIP WS (Pitts)
* U(6S)?
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48R.Itoh, FPCapri2016
CKM constraint with and without LHCb
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49R.Itoh, FPCapri2016
Belle II dominates here
Tight race
Tight race Belle II ahead
BψKSBφKS
Bη’KS
Bπ+ π- CPV
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50R.Itoh, FPCapri2016
Readiness of Belle II data analysis software
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51R.Itoh, FPCapri2016
Tracking Performance
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52R.Itoh, FPCapri2016
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53R.Itoh, FPCapri2016
The importance of NP theory code from experimentalist's viewpoint
- To search for the evidence of new physics in the measurements obtained in the Belle II data analysis, the comparison with theoretical predictions which includes NP effects is essential.
- In the past, such predictions are given by theorists independently of experiments, like predictions of branching fractions with NP effects.
- But the recent analyses in experiments are quite complicated and a simple comparison tends to become difficult.
- For the detailed study of NP effects in the experiment, the NP effect has to be simulated in various measurements by Monte Carlo.
- In such simulations, the NP effects have to be coded in the Event Generator which simulates the physics process B decays. <- Necessity of theory codes of NP models
- The theory codes are desired to be public so that event generator developer can implement them freely.
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54R.Itoh, FPCapri2016
Theory Interface
EventGenerator
Belle IIDetector
SimulationBelle IIEvent
Reconstruction
PhysicsAnalysis
GlobalFit
Determine the best parameter setsby the statistical analysis
Real datafrom Belle IIdetector
NP modelNP modelNP modelNP models are parameterized usingthe common parametersets (ex. Wilson Coeffs)
Iterative loopIterative loop
Global fit optimized for Belle II experiment
Various NP models are plugged into the frameworkthrough the common Theory Interface
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55R.Itoh, FPCapri2016
Belle : BK*l+l- update
shown at LHCSki workshop 2016
* ~2.1 s dicrepancy from SM in bin 2 of P
5'
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56R.Itoh, FPCapri2016
Belle : BD*tn by semi-leptonic tag
had. tag result
shown at Moriond'16
consistent