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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,

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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

psd8@physics.gla.ac.ukhttp://www.psd8.physics.gla.ac.uk