Status and Perspectives of High Luminosity Flavour Factories
LHCb Upgrade: Flavour Physics at High Luminosity
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Transcript of LHCb Upgrade: Flavour Physics at High Luminosity
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LHCb Upgrade:Flavour Physics
at High LuminosityChris Parkes
EPS HEP Conference, Manchester, Detector Session, July 21st 2007
•LHCb - Aims for first phase (~2013)•SuperLHCb physics – Probing New Physics•Technology - Vertex Trigger, Radiation Level•Conclusion- Forward Plan
Thanks to LHCb collaborators, notably:Hans Dijkstra, Jim Libby, Franz Muheim, Guy Wilkinson,
2
p p
250 mrad
10 mrad
Dedicated B System CP Violation & Rare Decay Experiment
•Full spectrum of B hadrons:
• Bs system, All angles, sides of both CKM s
•Lots of events !
baryons ,B,B 0sd,cu,
yearper pairsbb )(10 μb, 500σ 12bb
O
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LHCb Construction on Schedule
Muon Calorimeters RICH2Trackers
Magnet
RICH1VELO
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LHCb Goals - First Phase 10 fb-1
• First observation of very rare decay
• Bs mixing phase
• Unitarity Triangle
• Spectacular progress in heavy flavour physics:– Baseline measurement ACP (J/KS) – Bs Oscillations Measurement, Charm results
• Impressive range of additional measurements
Flavour Physics Progress
sB
s at 0.01 rad
BDKBsDsK B(s)h+h− exploiting U-spin
γ at few degrees
TodayToday
10 fb10 fb-1 -1
LHCbLHCb+ lattice + lattice
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LHCb Physics Programme
But NOT Limited by LHCLimited by Detector
• Upgrade to extend Physics reach – Exploit advances in detector technology
–Radiation Hard Vertex Detector–Displaced Vertex Trigger
– Better utilise LHC capabilities
• Timescale, 2015
• Collect ~100 fb-1 data
• Modest cost compared with existing accelerator infrastructure
Independent ofLHC upgrade
•SLHC not needed•But compatible
with SLHC phase
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Upgrade Physics Programme Examples
• CP Violation– Angle to better than 10
– Tree Diagram Dominated Decays, <<10 theory
– Gluonic Penguins
BdK0
KDB 0 KDB ss
Complementary to ATLAS / CMS direct searches•New particles are discovered
•LHCb measure flavour couplings through loop diagrams• No new particles are found
•LHCb probe NP at multi-TeV energy scale
KBd Angular Correlations
- Not just Afb
•Rare Decays
• Charm Physics• Mixing studies in D0→hh• CPV searches
• Rare decays, eg. D(0)(s)→l+l- [(Xu,s)]
LHCb 2 fb-1 superimposed
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Bs mixing phase s
/JBs
Upgrade can achieve 10% measurement of SM
Also measure from loops - penguin dominated
sB
= New Physics !
Standard LHCb 1 Year
SMq
iqq mehm q 21
CDF ms
Little Higgs Model
s
Blanke & Buras[hep-ph/0703117]
SM
Ligeti et al.
[hep-ph/0604112]
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Initial Phase of LHCb Operations• Data taking starts 2008
Defocus LHC beams•LHCb L= 2x1032 cm-2s-1
•Factor 50 below ATLAS/CMS design L•Most events have single interaction
•Displaced Vertex trigger•2nd level of triggering
•Multiple Interactions •Limit Triggering
rate of pp interactions
•LHCb Upgrade L= 2x1033 cm-2s-1
•Cope with 4 int./x-ing
•SLHC peak L= 8×1034 cm-2s-1
•Baseline - 40MHz, alternate High, Low I
H LLHCb
GPDs H H
Effective 20MHz Crossing rate
Select Low I for desired luminosity
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LHCb Trigger System• Cope with 4 interactions / beam crossing
Existing 1st Level Trigger 1MHz readout•Veto on multiple interactions
•Existing Trigger based on:
•High pT Muons•Calorimeter Clusters
Events with muons – trigger efficient
Events with hadrons – need improved trigger
Require Displaced Vertex TriggerAt 1st level
Current 1st Level Trigger Performance
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Trigger Gains – 40 MHz readout• Improve efficiency for hadrons and photons
– εTrig(B→hadronic) ~ 25-35%– εTrig(B→γX) ~ 30-40%– εTrig(B→μμX) ~ 60-70%
• Higher Level Trigger– Only limitations
• CPU • Algorithmic
Ingenuity– (Former) improves
with Moore’s Law
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Radiation Hard Vertex Locator
• Upgrade Requires high radiation tolerance device
>1015 1 MeV neutroneq /cm2
• Strixels / Pixels– n-on-p, MCz, 3D
Z Beam
8cm
VELO Module
Active Silicon only 8mm from LHC beam
Pixel layout
x
z
390
mra
d
60 mrad
15 mrad
1 m
x
y
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LHCb Upgrade Baseline & Issues• Trigger in CPU Farm
– Event building at 40 MHZ, CPU power OK – Hadron efficiency ~ factor two improvement
• Read-out all detector 40MHz– Replace all FE Electronics
• Vertex locator, Silicon Tracker, RICH HPD, • Outer Tracker FE, Calorimeter FE boards
• Radiation Damage– Need to replace Velo anyway– Inner part of Shashlik Calorimeter– Inner part of silicon tracker– Remove muon chamber before Calorimeter
• Occupancy– Inner part of outer tracker, 6%25%
• Increase silicon coverage (faster gas, scintillating fibres)
– Tracking algorithms for higher occupancy
Inner / Outer Tracker
PWO crystals
ECAL
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• Major Physics Programme at modest cost
– Flavour Sector of New Physics s measurement
– Precision • Critical Technology
– Radiation Hard Vertex Detector
– With Displaced Vertex Trigger
• Compatible with but independent of SLHC
Upgrade Summary
W
W
b 0
sB
s
b
s 0sB
t
t? ?
?
?
LHCb preparation in good shape Looking forward to first data
And an even brighter far future
Lowry Upgrade
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University of Glasgow, Scotland1st - 5th September 2008
The conference explores the scientific and technical developments of detector systems used in: Astronomy and space
science; Astrophysics; Condensed matter studies; Industrial applications;
Life sciences; Medical physics; Nuclear Physics, Particle physics and Synchrotron based science.
National Organising
Committee(subject to change)
P.P. Allport, LiverpoolR.L. Bates, GlasgowA.J. Bird, SouthamptonC.R. Cunningham, UK
ATC, EdinburghG.E. Derbyshire, STFC,
RALP. Evans, ICR, London R. Farrow, STFC,
DaresburyW. Faruqi, MRC,
CambridgeM. Grande, AberystwythP.R. Hobson, BrunelD.P. Langstaff,
AberystwythP.J. Nolan, LiverpoolD.J. Parker, BirminghamP.J. Sellin, SurreyA. Smith, MSSL, LondonR. Speller, UCL, LondonT.J. Sumner, IC, LondonS. Watts, Manchester
[email protected]://www.psd8.physics.gla.ac.uk