cern june 6-9 2006hera-lhc workshop status and startup for physics with lhcb g. passaleva...

CERN June 6-9 2006 HERA-LHC Workshop

Status and startup for physics with LHCb

G Passaleva(INFN-Firenze)

On behalf of the LHCb collaboration

CERN June 6-9 2006 HERA-LHC Workshop G Passaleva 2

Outlinebull The LHCb experiment

ndash Detectorsndash Triggerndash Expected performancendash Detector status

bull LHC startup scenario bull Commissioning plansbull First physics measurementsbull Conclusions


LHCb environment

100 b

230 b

pp

inte

ract

ions

cross

ing

Forward peaked correlatedbb pair production LHCb is a forward spectrometer20 lt || lt 53

L tuneable by defocusing the beamsbull Choose to run at ltLgt ~ 21032 cmndash2sndash1

(max 51032 cmndash2sndash1)ndash Will be available from 1st physics runndash Clean environment (n = 05)

bull 2 fbndash1 year


The LHCb spectrometer


Trigger

Output rate

Event type Physics

200 Hz Exclusive B candidates

B (core program)

600 Hz High mass di-muons J bJX (unbiased)

300 Hz D candidates Charm

900 Hz Inclusive b (eg b) B (data mining)

10 MHz

(visible bunch crossings)

Level-0pT of

e h

CalorimeterMuon system

Pile-up system

1 MHz

HLTConfirm level-0Associate PtIP

Full event reconstrInclusiveexclusiveselections

Full detector information

2 kHz

L0 custom hardware

HLT CPU farm


Expected performance

bull Full detector simulation based on Pythia and GEANT4bull Full pattern recognition implementedbull Track finding efficiency ~ 95 for long tracks p gt 10 GeVc bull Momentum resolution 04bull Mass resolution ~ 14 MeVc2 for B mesonsbull Secondary vertex resolution ( in z) ~ 170 mbull Proper time resolution for B decays ~ 40 fs

Bd Bs

Comb D2

4-5 7-9

Flavour tagging efficiency

1 = 33

fs2 = 67

fs

BsrarrDs

prop

er t

ime

(31)


Particle ID

Resolved 0

Merged 0

Neutral reconstructionGood efficiency for 0 in B0 + - 0 using both resolved and merged clusters in the ECAL

Modes with multiple neutrals (0 KShellip) will be challenging at LHCb

Efficiency ~53

K separation provided by RICH for 2ltplt100 GeVbulllt(KKp)gt = 83bulllt(Kp)gt = 6Clean separation of two-body B decays e g B

(m)=12 MeV


Detector status a snapshot from the pit

Mu

on

Syste

m

Calo

rim

ete

rs

RIC

H2

Mag

net

Tra

ckin

g s

yste

m

Vert

ex

Dete

cto

r

RIC

H1

In the pit

To be installed


All four panels M2-M4 installed87 of muon chambers built

Muon system support walls

Rolf Lindner 01062006



Muon chamber supporting wall from top


Arrival of Outer Tracker support structure April lsquo06 18 m

Outer Tracker installation



The vacuum tank of the vertex detector is lowered into the pithellip

Vertex detector installation

hellipand installed in front of the RICH I magnetic shield (in blue)

Rolf L

indner

010

62

006


POINT 7

POINT 1

IP8

LHC both sides of the IP8


Detector status details

bull Magnet installed amp mappedbull Vertex detector Vacuum tank being installed silicon modules in

production installation at beginning of 2007bull Tracking system Production almost complete installation in the pit

will end in fall 2006bull Calorimeters installation finished commissioning ongoingbull RICH System RICH I shielding installed installation completed by fall

2006 RICH II in the pit installation ongoingbull Muon system 85 of chambers produced installation in progress

bull ONOFF-line software is progressing well


Detector status

bull Plan to have everything installed by the end of 2006beginning of 2007

bull Aiming to have the complete experiment ready for data taking in 2007


LHC startup scenario (from the LHCb point of view)

From the LHCb point of view this would be a desirable scenario

2007 detector alignment and calibration possibly already with J signals from pp collisions

2008 05 fb-1

2009 10 fb-1

2010 15 fb-1

ie ~3 fb-1 by the end of 2010 at the required average luminosity of ~2x1032 cm-2s-1


Commissioning plansGlobal commissioning without beam in 2006 - 2007

bull Commission the subdetectors (starting now )

bull Test the DAQ

bull Test the electronics calibration procedures

bull Check the scalability of the system improve when needed

bull Use of circulating beam in summer 2007 LHCb is a forward detector cosmics can not help beam-gas gives useful tracks for time and position alignment Study of beam gas events ongoing useful also for measuring and monitorng the luminosity (cross section measurements See M Ferro-Luzzi contribution to this workshop)

Pilot Run (low luminosity)bull 1048698Without magnetic field (time and space) alignmentsbull 1048698With magnetic field Trigger setup and start collecting data


1 Use special samples (mainly from inclusive HLT) for recontsruction and PID calibration and tuning J for IDD D0(K) for K ID and mis-ID

Preparing for physicshellipwith 01 fb-1 of data

B0D3 hours of data-taking

3 Use B0 control channels for oscillation measurement as a first check of tagging performance

events after triggerxSelection (01 fb-1)

B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds

() 50 k 1-2 per tagger

2 Use B+B0 control channels for tagging tuning


First physics measurements

LHCb physics program with the very first data

bull Jproduction studies (eg prompt vs B JX bb cross section)

bull sin(2as a proof of principle of CPV measurements)

bull ms and s (after CDF ms measurement recent theoretical papers indicate s measurement as very interesting for NP)

bull Bs


Jproduction studiesLHCb will record a very large sample of J

(J prompt) = 0313 mb (J from B) = 11 b

LHCb measurement of bb will allow a test of QCD in new region of phase space

bull Not really for the very first data A rough measurement would be iteresting anyway

Inclusive HLT rate 600 Hz

True J rate 130 Hz

109 J per year

First preliminary studies on bb production cross section using B J decays are ongoing

bull ATLASCMS will measure || lt 25bull ALICE will measure || lt 09 and 25 lt || lt 4bull LHCb will measure 20 lt || lt 53


Jproduction studiesGenerator studies

bull Detailed generator studies on quarkonia production are ongoing

bull First preliminary results give large inconsistency between our standard PYTHIA settings (v 63) and version 64 where NRQCD model has been introduced for heavy quarkonia production

(J prompt) ~ 3 times lower

(See M Bargiotti talk at this workshop for details)

even a rough measurement of the ratio of prompt J vs J from B will be very interesting at the very beginning


sin(2) with B0J KS

bullDemonstrate tagging performance and ability for CP physics

bull Sensitivity ndash LHCb expects ~60k signal events

for 05 fb-1

stat(sin(2)) ~ 004

ACP(t) (background subtracted)

Expected to be one of the first CP measurements


Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs

LHCbbull CDF results with 1 fb

37k fully reconstructed Bs Dsndash+ Ds

ndash3~85 fs D2 = 5 ~3 significance at ms~17 ps

bull CDF measurement is already statistically very precise (~2)

LHCb can reach Tevatron (statisticalhellip) precision in the first months of data taking Note also that as ms~17 ps the ultimate of LHCbis not essentialms is in any case needed for s measurement

bull LHCb expects120k BsDs evtsyear (2 fbndash1)BS = 04 ~ 40 fs D2 = 9


s and s from BsJ

Bs J is the Bs counterpart of B0J KS

bullBs mixing phase s is very small in SM

s = ndasharg(Vts2)=ndash22 ~ ndash004

sensitive probe for new physics

Sensitivity (at ms = 175 psndash1)bull131k Bs J signal eventsyear

BS=012stat(sin s) = 0023stat(ss) ~ 0011 (1 year 2 fbndash1)

J final state contains two vectorsangular analysis needed to separate CP-even and CP-oddFit for sin s s and CP-odd fraction (needs external ms)

Recent theoretical works indicate that large values of s are not excluded

already with 02 fb-1 set an interesting limit or measure it if large


Constraints on NP from s measurement

(from hep-ph0604112)

gt90 CL

gt32 CLgt5 CL

After LHCb measurement of s with (s)=

plusmn01(~ 02 fbndash1)

courtesy Z Ligeti

hs

s

UT fit collaboration estimate for s (hep-ph0605213)

SJ = sin(2-2s) = 007 plusmn 049

Constraints on NP contribution to s


Bs +ndash

Very rare decay sensitive to new physicsBR ~ 35 10ndash9 in SM can be strongly enhanced in SUSYCurrent limit from Tevatron D0 2310ndash7 at 95 CL CDF 1010ndash7 at 95 CL

1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s

LHCb 2 fbndash1 17 lt 100 lt 7500In principle a (lucky ) measurement is possible already with 05 fb-1

LHCb has prospect for significant measurement but difficult to get reliable estimate of expected backgroundFull simulation 10M incl bb events + 10M b b events (all rejected)


Conclusions

bull Construction of LHCb is well advanced we plan to complete the installation by the end of 2006 aiming to have the full detector ready for data in 2007

bull Commisioning strategy is being prepared in detail

bull Strategy for calibrations alignments trigger and analysis tuning being devised

bull Already with the very first data very interesting measurement can be performed I invite you to follow the startup of our experiment


Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans



Jy production studies

Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions


Outlinebull The LHCb experiment

ndash Detectorsndash Triggerndash Expected performancendash Detector status

bull LHC startup scenario bull Commissioning plansbull First physics measurementsbull Conclusions


LHCb environment

100 b

230 b

pp

inte

ract

ions

cross

ing








Trigger

Output rate

Event type Physics


B (core program)




10 MHz


Level-0pT of

e h


Pile-up system

1 MHz




2 kHz

L0 custom hardware

HLT CPU farm




Bd Bs

Comb D2

4-5 7-9


1 = 33

fs2 = 67

fs

BsrarrDs

prop

er t

ime

(31)


Particle ID

Resolved 0

Merged 0



Efficiency ~53


(m)=12 MeV



Mu

on

Syste

m

Calo

rim

ete

rs

RIC

H2

Mag

net

Tra

ckin

g s

yste

m

Vert

ex

Dete

cto

r

RIC

H1

In the pit

To be installed
















Rolf L

indner

010

62

006


POINT 7

POINT 1

IP8










Detector status







2008 05 fb-1

2009 10 fb-1

2010 15 fb-1





bull Test the DAQ











B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds









bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions


LHCb environment

100 b

230 b

pp

inte

ract

ions

cross

ing








Trigger

Output rate

Event type Physics


B (core program)




10 MHz


Level-0pT of

e h


Pile-up system

1 MHz




2 kHz

L0 custom hardware

HLT CPU farm




Bd Bs

Comb D2

4-5 7-9


1 = 33

fs2 = 67

fs

BsrarrDs

prop

er t

ime

(31)


Particle ID

Resolved 0

Merged 0



Efficiency ~53


(m)=12 MeV



Mu

on

Syste

m

Calo

rim

ete

rs

RIC

H2

Mag

net

Tra

ckin

g s

yste

m

Vert

ex

Dete

cto

r

RIC

H1

In the pit

To be installed
















Rolf L

indner

010

62

006


POINT 7

POINT 1

IP8










Detector status







2008 05 fb-1

2009 10 fb-1

2010 15 fb-1





bull Test the DAQ











B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds









bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions




Trigger

Output rate

Event type Physics


B (core program)




10 MHz


Level-0pT of

e h


Pile-up system

1 MHz




2 kHz

L0 custom hardware

HLT CPU farm




Bd Bs

Comb D2

4-5 7-9


1 = 33

fs2 = 67

fs

BsrarrDs

prop

er t

ime

(31)


Particle ID

Resolved 0

Merged 0



Efficiency ~53


(m)=12 MeV



Mu

on

Syste

m

Calo

rim

ete

rs

RIC

H2

Mag

net

Tra

ckin

g s

yste

m

Vert

ex

Dete

cto

r

RIC

H1

In the pit

To be installed
















Rolf L

indner

010

62

006


POINT 7

POINT 1

IP8










Detector status







2008 05 fb-1

2009 10 fb-1

2010 15 fb-1





bull Test the DAQ











B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds









bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions




Bd Bs

Comb D2

4-5 7-9


1 = 33

fs2 = 67

fs

BsrarrDs

prop

er t

ime

(31)


Particle ID

Resolved 0

Merged 0



Efficiency ~53


(m)=12 MeV



Mu

on

Syste

m

Calo

rim

ete

rs

RIC

H2

Mag

net

Tra

ckin

g s

yste

m

Vert

ex

Dete

cto

r

RIC

H1

In the pit

To be installed
















Rolf L

indner

010

62

006


POINT 7

POINT 1

IP8










Detector status







2008 05 fb-1

2009 10 fb-1

2010 15 fb-1





bull Test the DAQ











B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds









bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions


Particle ID

Resolved 0

Merged 0



Efficiency ~53


(m)=12 MeV



Mu

on

Syste

m

Calo

rim

ete

rs

RIC

H2

Mag

net

Tra

ckin

g s

yste

m

Vert

ex

Dete

cto

r

RIC

H1

In the pit

To be installed
















Rolf L

indner

010

62

006


POINT 7

POINT 1

IP8










Detector status







2008 05 fb-1

2009 10 fb-1

2010 15 fb-1





bull Test the DAQ











B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds









bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions



Mu

on

Syste

m

Calo

rim

ete

rs

RIC

H2

Mag

net

Tra

ckin

g s

yste

m

Vert

ex

Dete

cto

r

RIC

H1

In the pit

To be installed
















Rolf L

indner

010

62

006


POINT 7

POINT 1

IP8










Detector status







2008 05 fb-1

2009 10 fb-1

2010 15 fb-1





bull Test the DAQ











B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds









bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions
















Rolf L

indner

010

62

006


POINT 7

POINT 1

IP8










Detector status







2008 05 fb-1

2009 10 fb-1

2010 15 fb-1





bull Test the DAQ











B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds









bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions


POINT 7

POINT 1

IP8










Detector status







2008 05 fb-1

2009 10 fb-1

2010 15 fb-1





bull Test the DAQ











B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds









bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions









Detector status







2008 05 fb-1

2009 10 fb-1

2010 15 fb-1





bull Test the DAQ











B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds









bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions





2008 05 fb-1

2009 10 fb-1

2010 15 fb-1





bull Test the DAQ











B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds









bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions




bull Test the DAQ











B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds









bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions







B+ J()K+ 80 k B+ D0() 100 k B0 D+ 350 kBs Ds









bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions







bull Bs







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions







True J rate 130 Hz

109 J per year











sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions









sin(2) with B0J KS



for 05 fb-1

stat(sin(2)) ~ 004




Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions


Bs mixing ms

CDF ms 1733 021042 007 ps 1

9021170 1 lcpsmD s

1 year (2 fbndash

1)ms= 20 ps-1

Bs Ds- +

()~40 fs








s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions


s and s from BsJ













gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions




gt90 CL

gt32 CLgt5 CL



courtesy Z Ligeti

hs

s


SJ = sin(2-2s) = 007 plusmn 049



Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions


Bs +ndash


1 yearBs ndash

signal (SM)

b bbackgroun

d

Inclusive bb

background

All background

s




Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions


Conclusions






Outline

LHCb environment


Trigger


Particle ID








Detector status


Commissioning plans




Slide 21

sin(2) with B0J KS

Bs mixing ms

fs and DGs from BsJ


Bs +ndash

Conclusions

cern june 6-9 2006hera-lhc workshop status and startup for physics with lhcb g. passaleva...

Documents