LHCb Project ReviewJim Libby

3rd October 2005

LHC and LHCb statusLHCb in OxfordProducing the hardwarePreparing for data I: softwarePreparing for data II: physics

3/10/2005 Oxford Project Review 2005 2

LHCb introduction LHCb is designed to:

1. make precision measurements of CP violation in the decay of all flavours of B mesons

2. search for New Physics in rare B decays that only proceed at loop level in the Standard Model i.e. B→K*μ+μ-

Aiming to be making measurements from day one in 2007

Schematic of the LHCb experiment

2 Ring Imaging Cerenkovdetectors (RICHes) provide

particle ID over a wide range of momenta-key for hadronic B decays important for CP

studies

RICH electronics, mechanics and

software, along withphysics preparation

and LCG are Oxford’s LHCb activities

3/10/2005 Oxford Project Review 2005 3

LHC and LHCb status LHCb at IP8 on LHC

ring-cryoline installation complete about this point

LHC dipoles are being installed: nearly 100 out of 1234

LHCb installation is on schedule

RICH2 ready to begin life underground

t0 for LHC still 1/7/07

3/10/2005 Oxford Project Review 2005 4

RICH 2 complete

3/10/2005 Oxford Project Review 2005 5

LHC and LHCb status LHCb at IP8 on LHC

ring-cryoline installation complete about this point

LHC dipoles are being installed: nearly 100 out of 1234

LHCb installation is on schedule

RICH2 ready to begin life underground

t0 for LHC still 1/7/07

3/10/2005 Oxford Project Review 2005 6

The Oxford group

Faculty: N. Harnew & G. WilkinsonDept. Lecturer: JLAdv. PPARC fellow: J. Rademacker* Postdocs: M. Adinolfi & R. MuresanStudents: L. Somerville, V. Gligorov, I. Stoke-Rees (GRID),

A. Powell & S. Brisbane Electronic Engineers: J. Bibby & P. Sullivan & (M. Jones)Electronic Technicians: N. RotoloDrawing office and workshop: R. Senanayake, T. Handford, (W. Lau,

B. Ottewell & S. Yang)System Engineers: S. Topp-Jorgensen & (I. McArthur)Grid programmers: C. Cioffi & A. Soroko

New arrivals since October 2004*Shared with CDF(Invaluable support)

To be appointed: responsive RA to work on charm physics

3/10/2005 Oxford Project Review 2005 7

Producing the LHCb hardware

Oxford’s responsibility is the front-end electronics for the RICH detectors

Hybrid Photo-Detectors (HPD) detect the Cherenkov radiation induced photoelectrons on a 32×32 pixel detector encapsulated within the detector

The L0 electronics: are located on the detector transfer the accepted data at a

rate of 1 MHz services the pixel chip with low

voltage, timing, trigger and control signals

readout pixel chip

silicon detectorSchematic of a HPD section

72 mm

3/10/2005 Oxford Project Review 2005 8

The production L0 board

PIXEL anodes

Kaptons

PINT FPGA

Trigger, Timing and Control

PILOT: reference I and V for PIXEL

JTAG: board/PIXEL setup

Fibre opticdata links

10 cm

16.5 cm

3/10/2005 Oxford Project Review 2005 9

RICH front-end electronics Prototype L0 board validated in

test beam during autumn 2005 and extensive lab tests in Oxford

Production Readiness Review passed in June A few recommendations

being implemented Production ready to commence

once final tests completed < 1 month

300 boards to be produced then tested in Oxford 242 required to equip both

RICHes On schedule for system tests

and installationSingle track Cherenkov ring:

10 GeV/c π in C4F10 radiator (RICH1)

3/10/2005 Oxford Project Review 2005 10

RICH1 mechanics With IC produced final

design of the RICH1 gas enclosure

Produced final engineering drawings

Performed FEA to validate design

Responsible for procurement Should be at Oxford in a

couple of weeks Programme of leak tests in

Oxford Will perform installation

with IC Design of mechanical

support and lifting rig Max deformation (out of the plane of plate i.e. bending): 0.144mm

S. Yang

R. Senanayake

3/10/2005 Oxford Project Review 2005 11

RICH commissioning Neville is the RICH project leader during the production,

integration and commissioning phase of LHCb Ongoing system tests at CERN with integration of production

HPDs, L0 and L1 electronics, low and high voltage and control systems Mechanical units of 16 HPDs (columns)

Single and triple column tests at CERN and with beam at Frascati in the next 6 months

40 MHz beam tests at CERN in summer 2006

Installation of L0 electronics in RICH2 will begin next year

Significant participation by Oxford

3/10/2005 Oxford Project Review 2005 12

Preparing for data – RICH software RICH software project coordinated by Guy:

Simulation Reconstruction: pattern recognition, particle ID and higher level triggers Calibration: alignment, calibration with data and database

Using golden kinematics of D*+→D0π+ decays to select a pure samples of D0 →K-π+ (and charge conjugate decays)

The charge of the tracks from the D0 decays define pure samples of π and K from which identification efficiencies can be derived solely from data Preliminary studies

show that the efficiencies match those derived from MC truth

Potential for sub % accuracyπ

(GeV/c)

(GeV/c)

K

Raluca Muresan

3/10/2005 Oxford Project Review 2005 13

Preparing for data – losing the MC crutch

In a similar vein, but moving away from the RICH and toward physics studies

Flavour tagging L. Somerville has

developed a methods to estimate mistag rates from self tagging control channels such as B→J/ψK*

encouraging first results

The fitted lifetime : 475.0 ± 12.9 μmTrue B lifetime : 460.2 μm

Lifetime fitting V. Gligorov has implemented

Jonas’ CDF method for using a data-derived acceptance function to correct for impact parameter selection induced bias

3/10/2005 Oxford Project Review 2005 14

Exploiting the data LHCb will make important measurements from day 1 To achieve this a new working group structure is in place:

Guy co-convener of the CP measurements group A physics book targeted at outlining the path to first publications

is in preparation-completed by end of 2006 Oxford is very active in physics studies particularly related to

the angle

3/10/2005 Oxford Project Review 2005 15

Getting at γ LHCb will make direct

measurements of the unitarity triangle angle γ

Current indirect precision will improve before 2007

We must do better directly!

Classic channel Bs→DsK suffers several problems with ambiguous solutions and limited statistics (14o precision in one year)

03.79.12 )3.57(

EPS 2005 without direct measurements

We are exploring new channels to measure γ

3/10/2005 Oxford Project Review 2005 16

γ is the weak phase between b→cus ( Vcb) and b→ucs ( Vub)

Two very promising strategies being pursued in Oxford Dalitz plot fit to 3 body decays D0 →Ksππ

exploits interferences between sub-resonances in decay Current world best measurement from e+e- B factories LHCb expects ~2000 events to tape per year

Atwood-Dunietz-Soni method with D0 →Kπ and D0 →Kπππ Toy studies by Guy indicate ~50 with 1 year of LHCb data

Global fit strategies

Measuring γ: B+→D0K+

cbV

*usV

ubV

*csV

No need for a time-dependent

analysis

3/10/2005 Oxford Project Review 2005 17

Exploiting the data LHCb will make important measurements from day 1 To achieve this a new working group structure is in place:

Guy co-convener of the CP measurements group A physics book targeted at outlining the path to first

publications is in preparation-completed by end of 2006 Oxford is very active in physics studies particularly

related to the angle New RA will explore the potential for charm physics at LHCb

Inclusive D* higher level trigger stream will provide ½ a billion D0 decays a year

Allows sensitivity to direct CP violation at level well below that predict by the SM

Unique opportunity to explore possible new physics induced CP violation in the up-type quark sector complements studies in down-type K and B sectors

3/10/2005 Oxford Project Review 2005 18

Toward the rolling grant-manpowerPosition 05/06 06/07 07/08 08/09 09/10 11/12 11/12

N. Harnew 1.0 1.0 0.9 0.7 0.7 0.7 0.7

G. Wilkinson 0.5 0.5 0.5 0.5 0.5 0.5 0.5

J. Rademacker 0.3 0.6 0.7 0.8 0.1

J. Libby 1.0 1.0 1.0 1.0 1.0 1.0 1.0

M. Adinolfi 1.0

eScience RA (RM)* 1.0 1.0 1.0 1.0 1.0 1.0 1.0

GRID RA (AS)* 0.5 0.5 0.5 0.5 0.3 0.2 0.2

GRID RA (CC)* 1.0 1.0 1.0 1.0 0.7 0.5 0.5

Responsive RA 0.3 1.0 1.0 0.7

New RA for physics 1.0 1.0 1.0 1.0 1.0

J. Bibby 0.5

P. Sullivan 0.7 0.7 0.7 0.7 0.5 0.3 0.3

N. Rotolo 1.0 1.0 1.0 0.7 0.5 0.3 0.3

S. Topp-Jorgensen 0.7 0.7 0.7 0.7 0.6 0.3 0.3

R. Senanayake 0.7 0.7

Mech. & Draw. Office 1.0 0.5 0.3 0.3 0.3 0.3 0.3

Colour KeyAcademicRASupport

*Positions currently end 9/07. Plan for them to be continued. (Current post holders initials in parenthesis)

£5-10k non-staff cost/annum

3/10/2005 Oxford Project Review 2005 19

Looking forward to 2006

When this talk is given next year data taking will be 9 months away!

L0 electronic production near completion RICH1 will be installed RICH commissioning of hardware and software will

be well underway Putting the physics tools in place to maximize the

data from day one: Controlling systematic effects with data Measuring γ Charm physics

3/10/2005 Oxford Project Review 2005 20

LCG activities