LHCb Project Review Jim Libby 3 rd October 2005 LHC and LHCb status LHCb in Oxford Producing the...
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Transcript of LHCb Project Review Jim Libby 3 rd October 2005 LHC and LHCb status LHCb in Oxford Producing the...
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