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H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 1 B factories - results and motivation for upgrade SuperKEB - how to reach 40x more luminosity.

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Presentation on theme: "H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 1 B factories - results and motivation for upgrade SuperKEB - how to reach 40x more luminosity."— Presentation transcript:

1 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 1 B factories - results and motivation for upgrade SuperKEB - how to reach 40x more luminosity Belle II - upgrade of the Belle detector to cope with 40x more luminosity Jennifer WP2: tasks and deliverables -Tracking -Particle ID (Alessandro Gaz) -Forward electromagnetic calorimeter (Claudia Cecchi) -Luminosity monitors (Cecile Rimbaud) Organisation/Schedule Jennifer Activities: WP2

2 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 B-factory Detectors – a huge success! 2 » Measurements of CKM matrix elements and angles of the unitarity triangle » Observation of direct CP violation in B decays » Measurements of rare decays (e.g., B  , D  ) » b  s transitions: probe for new sources of CPV and constraints from the b  s  branching fraction » Forward-backward asymmetry (A FB ) in b  s ll has become a powerfull tool to search for physics beyond SM. » Observation of D mixing » Searches for rare  decays » Observation of new hadrons B 0 tag _

3 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 Motivation for Upgrade Measure CKM elements as precisely as possible Overconstrain unitarity triangle Look for deviations from SM => Need about 50 ab -1    21.±1 0.9) o    88.4 ±5.6) o    70 ±29) o Babar/BelleWith 50 ab -1 (same central values) 3

4 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 e- 2.6 A e+ 3.6 A To get x40 higher luminosity Colliding bunches e+ Damping ring New beam pipes & bellows Replace beam pipes to suppress electron cloud (TiN-coated beam pipe with antechambers) Redesign the lattice to squeeze the emittance (replace short dipoles with longer ones, increase wiggler cycles) Reinforce RF systems for higher beam currents New positron capture section New superconducting final focusing magnets near the IP Low emittance electron gun KEKB to SuperKEKB Improve beam monitors and control system 4

5 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 Luminosity Upgrade 5

6 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 Requirements for the Belle II detector --  reduced by a factor of 2: compensated by improved vertexing - radiation damage and occupancy - fake hits and pile-up noise in the EM Calorimeter - higher rate trigger, DAQ and computing Critical issues at L= 8 x 10 35 /cm 2 /sec  Higher background (  10-20)  Higher event rate (  10)  Special features required 6 Result: significant upgrade

7 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 Time-of-Flight, Aerogel Cherenkov Counter → Time-of-Propagation counter (barrel), prox. focusing Aerogel RICH (forward) Belle II 7 7.4 m RPC µ & K L counter: scintillator + Si-PM for end-caps 8.0 m CsI(Tl) EM calorimeter: waveform sampling electronics, pure CsI for end-caps 4 layers DS Si Vertex Detector → 2 layers PXD (DEPFET), 4 layers DSSD Central Drift Chamber: smaller cell size, long lever arm

8 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 8 CDC Smaller Cell size (1-20mm => 6-9 mm) all 51456 wires strung by last summer

9 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 Significant improvement in z-vertex resolution PXD: 2 layer Si pixel detector (DEPFET technology) (R = 1.4, 2.2 cm) monolithic sensor thickness 75 µm (!), pixel size 50 x 55 µm² to 50 x 85µm² (depending on layer and z) SVD: 4 layer Si strip detector (DSSD) (R = 3.8, 8.0, 11.5, 14.0 cm) 15  m 30  m Belle Belle II p  sin(  ) [GeV/c] 0.42.000.81.21.6 100 20 50 σ [µm] PXD PXD+SVD Silicon Tracking System @ Belle II 9

10 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 10 SVD 4 layers of double sided silicon detectors P-strips 50 – 75 µm pitch N-strips: 240 µm pitch Backside side readout signal routed to frontside by a flex circuit Low material budget (0.58% X0 /Layer) Readout chip: APV (originally for CMS) Very fast readout to cope with occupancy

11 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 DEPFET Each pixel is a p-channel FET on a completely depleted bulk Signal electrons accumulate in the internal gate and modulate the transistor current (g q ~ 400 pA/e - ) Fully depleted: large signal, fast signal collection Low capacitance, internal amplification: => low noise Rolling shutter mode (column parallel): 20 µs frame readout time Sensitive area thinned to 75 µm with a rigid support frame (all silicon module) Low power consumption within sensitive area (air cooling) Low material to reduce multiple scattering (0.21% X 0 ) 11

12 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 WP2 Tasks and Deliverables 12 WP2 - Belle-II detector construction and test [Months: 1-48] Task 2.1: Forward Electromagnetic Calorimeter [INFN, KEK] Task 2.2: Tracking detectors [DESY, HEPHY, INFN, METU, IFJ, UKP, KEK] Task 2.3: Particle Identification [INFN, JSI, KEK] Task 2.4: Luminosity monitor [CNRS, KEK] Number Deliverable Lead beneficiary Due Date (in months) D2.1 FW ECL TDR 1 INFN (10) Jan 2016 D2.2Commissioning Report FW ECLINFN (48) Mar 2019 D2.3 CDC commissioning METU(14) May 2016 D2.4 PXD White-book 2DESY (20) Nov 2016 D2.5 SVD+PXD full commissioning DESY(30) Sep 2017 D2.6TOP commissioning INFN (36) Mar 2018 D2.7ARICHJSI(26) May 2017 D2.8Diamond sensorCNRS(36) Mar 2018 WP2: 227 months of secondments (~20 FTE)

13 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 Task 2.2 Tracking Detectors 13 Task 2.2 Tracking Detectors Full CDC commissioning:(14) May 2016 1.Cosmic ray test of CDC modules in the Belle II area (6) Sep 2015 2.Installation of CDC chambers in Belle II (10) Feb 2106 3.CDC cosmic ray test inside Belle II, with and without magnetic field (12) Mar 2916 PXD Whitebook, “PXD technology, procedure and operation” (20) Nov 2016 Full integration and commissioning of SVD+PXD inside Belle II detector: (30) Sep 2017 1.First data with 1 VXD (4 SVD+ 2 PXD) Sector (14) May 2016 2.First cosmic data with SVD+PXD (16) Jul 2016 3.First beam data with SVD+PXD and all other Belle II sub-detectors(20) Nov 2016 4.A 4-layer DSSD Vertex Detector integrated in the Belle II tracking system (24) Mar 2017 5.Environmental monitoring for SVD and Belle II radiation protection system (24) Mar 2017 Jennifer Institutes: HEPHY (Austria), INFN (Italy), METU (Turkey), IFJ (Poland), UKP (Czech), DESY [DESY, Uni Bonn, Uni Giessen, Uni Heidelberg, MPI] (Germany) 135 months of secondments for 2.2

14 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 Beast II 14 Main purpose of Beast II: -Beam conditioning to start collisions -Background measurements and mitigation -Belle II commissioning with partial VXD sensors -Optimization of interlock system Installation of 2 PXD & 4 SVD layers (& other specific sensors for background determination) Beast II: May – December 2017 Subtask 2.2.1: First data with 1 VXD (4 SVD+ 2 PXD) Sector

15 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 SuperKEKB Cchedule 15 To budget problems up to 1 year delay (especially VXD installation and physics)

16 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 Implications for Jennifer 16 Schedule changes: CDC cosmic ray tests (Jennifer Sept. 2015) => May 2016? CDC installation (Jennifer: January 2016) => August 2016 CDC cosmic ray tests in Belle II (Jennifer: March 2016) => December 2016 CDC fully commissioning (Jennifer May 2016) => March 2017 ? VXD sector test (Beast II) (Jennifer: May 2016) => May 2017 ? Full VXD cosmic test (Jennifer: July 2016) => 2 nd half of 2017 ? 1 st beam with VXD in Belle II (Jennifer: November 2017) => October 2018 For other tasks (PID, ECL, lumi): see next talks

17 H.-G. Moser, Jennifer Consortium Meeting, Rome, June 10-12, 2015 Conclusions 17 Belle II will be a key player in flavour physics and CP violation Very challenging upgrade program of the detector Jennifer supports essential parts of the detector upgrade program 227 months of secondments (20 FTE !) Due to the latest schedule changes of superKEKB/Belle II some adaptations of the Jennifer deliverables (dates) are needed (mostly tracking detectors)

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