CERN, 7 Settembre 2005 Conference room 40-R-B10 09:30 Iacopini:Introduzione 10:30 Fantechi Status...

CERN, 7 Settembre 2005 CERN, 7 Settembre 2005 Conference room 40-R-B10 Conference room 40-R-B10

09:30 Iacopini:09:30 Iacopini: IntroduzioneIntroduzione10:3010:30 Fantechi Fantechi Status report VetoStatus report Veto11:00 Valente 11:00 Valente Test Beam svolto ai LNF, stato simulazioni, Test Beam svolto ai LNF, stato simulazioni,

ripartizione attivita' tra le Sez. Interessateripartizione attivita' tra le Sez. Interessate11:4011:40 Piccini Piccini OdoscopioOdoscopio12:10 Scarpa 12:10 Scarpa GigatrackerGigatracker

12:4012:40 Pranzo Pranzo

14:0014:00 Illustrazione richieste 2006 Illustrazione richieste 2006

s d

+K E. Iacopini, 7 Sett. 05E. Iacopini, 7 Sett. 05

Nota scrittaNota scritta

SiSi

Nota scrittaNota scritta

Ke3 pubblicatoKe3 pubblicatoKmu3 in progressKmu3 in progress

90%90%

Presentato Presentato in CSN1in CSN1

80%80%

OKOK

Ferrara: Ferrara: Dottorando: Massimiliano Fiorini, da Marzo 2003 a Febbraio-Marzo 2006. Proseguirà con un assegno PRIN2005.Assegnisti: Marcella Scarpa, che finisce con il 2005Chiara Damiani, che continuerà l’attività con un nuovo assegno da Marzo 2006.

Firenze:Firenze: Francesca Bucci, assegnista dal 1/7/05, per 2 anniFrancesca Bucci, assegnista dal 1/7/05, per 2 anni

Napoli:Napoli: 1 assegnista al 50 % (scadenza contratto Febbraio 2007)1 assegnista al 50 % (scadenza contratto Febbraio 2007)

LNF:LNF: al momento, nessuno.al momento, nessuno.

Perugia:Perugia: Raggi termina la borsa di dottorato nell'ottobre 2005. Raggi termina la borsa di dottorato nell'ottobre 2005. Imbergamo, dottorando senza borsa, conclude il dottorato nel Imbergamo, dottorando senza borsa, conclude il dottorato nel 2005 come Raggi. Ha un assegno di ricerca fino a settembre.2005 come Raggi. Ha un assegno di ricerca fino a settembre.Piccini, assegnista INFN, ha iniziato il suo assegno di ricerca nel Piccini, assegnista INFN, ha iniziato il suo assegno di ricerca nel maggio 2005 e nel 2006 avrà il prolungamento al secondo annomaggio 2005 e nel 2006 avrà il prolungamento al secondo anno

Pisa: Pisa: Dottorandi: Lamanna e Venditti Dottorandi: Lamanna e Venditti Il Lamanna si addottorera' entro la fine dell' anno Il Lamanna si addottorera' entro la fine dell' anno e avràe avrà subito un assegno. Poi ci sono Sergio e subito un assegno. Poi ci sono Sergio e Gianmaria assegnisti SNS, entrambi in scadenza Gianmaria assegnisti SNS, entrambi in scadenza fine 2006, ma Sergio ha gia' avuto un rinnovofine 2006, ma Sergio ha gia' avuto un rinnovo

Roma1:Roma1: al momento, nessuno.al momento, nessuno.

Torino:Torino: Dottorandi: Silvia Goy Lopez e' al secondo anno,Dottorandi: Silvia Goy Lopez e' al secondo anno,Simone Bifani e' al primo anno Simone Bifani e' al primo anno

• Proposal submitted to SPSC on

June 11, 2005:“We propose to measure the very rare decay

K+ + at the CERN SPS to make a decisive test of the Standard Model by extracting a 10% measurement of the CKM parameter |Vtd|.”

• The open presentation to the SPSC is scheduled on September 27, 2005

A. Ceccucci August 31 2005 - CambridgeA. Ceccucci August 31 2005 - Cambridge

Recent developments in the rare kaon decay community

• A few months ago the Fermilab Directorate endorsed the PAC recommendation not to pursue K+ + at the Main InjectorThe physics of K+ + was considered very important but a

potential conflict for protons between the kaon and the neutrino possible programmes at Fermilab lead to this recommendation

• Very Recently the RSVP program was terminated:– The to e conversion experiment (MECO) and the K0

experiment, ready to start construction at BNL, will not be built

• This leaves CERN and Japan (JPARC) as the only places where an ultra-rare kaon decay experiments are currently envisaged

• However, to be completely fair, one should also mention:– Plans at Protvino as mentioned at KAON2005– Plans at Frascati to study KS at an upgraded phi factory


Strengthening P326• The demise of the US kaon program has triggered

negotiations with members of KOPIO/CKM to join P326• The following groups have signed up since the proposal

submission:– S Louis Potosi (Mexico, J. Engelfried)– Bolotov’s group (Moscow, INR)

• Interest to join has been expressed by the following groups:– Fermilab (P. Cooper) – BNL (L. Littenberg)– British Columbia (D. Bryman)

• It is my understanding that a possible participation of US groups is subject to: – DOE support towards a strong contribution to the

construction of the detector (notably the RICH counter)– The involvement of US University in addition to National

Labs (at least for BNL)


Endorsement of P326 R&D by SPSC

• From the draft minutes of the July 05 meeting:

"The SPSC considers it important that an R&D programme continues concerned with the possibility of an experiment to measure the rare decay K++ "


CERN Program and Plans

introduction to Round Table discussion onThe Future of High Energy Physics

ECFA-EPS Joint Session at HEPP-EPS 2005International Europhysics Conference onHigh Energy PhysicsLisbon, July 21 -27, 2005

Jos EngelenCERN

2004 2005 2006 2007 2008 2009 2010

LHC ExperimentsALICEATLASCMSLHCbTOTEMOther LHC Experiments(e.g. MOEDAL, LHCf)

Non-LHC Experimental ProgrammeSPSCOMPASSNA48NA60Neutrino / CNGSNew initiatives

OTHER FACILITIESADISOLDEn-TOF NeutronCASTDIRACTest Beams

North Areas

West Areas

East Hall

R&D(Detector & Accelerator)

Legend: Approved Under Consideration

PS

an

d S

PS

Sh

utd

ow

n

From Medium Term Plan, CERN/2615

•Will determine the future course of high energy physics•Detector completion/upgrade/in particular for luminosity upgrade ( 1035) (~2014); requires R&D, machine and detectors

•Very limited neutrino programme (in scope)•New initiatives include K++; why not K00..?•New initiatives may include a long term neutrino programme•CERN working groups Proton Accelerators for the Future (PAF) and Physics Opportunities at Future Proton Accelerators (POFPA)•New initiatives to appear in Budget Plan from 2006 (or maybe 2007) onwards

•Accelerator R&D includes EU funded networks, joint projects, design studies•Linear colliders: Eurotev (‘generic’) and CLIC (CERN and partners, ‘collaboration’, feasibility proof by 2009)

EURISOL Design Study (including beta beams)

No fully-fledged Neutrino Factory Design Study yet (2008 if EU support)

Choice of K+ momentum:

(for 400 GeV/c proton momentum)

40 50 60 70 80 90 100 110 120 130 140 1500

1

2

3

4

5

6

7

8

9

10

11

12

13

Acceptance

K+ flux/ 3 1012 inc.p)

/ Total beam

K+ decays in 50 m/ Total beam

Acc. K+ to

K+ / Total beam

K+ / +

/ 3 1012 inc. p

K+ decays in 50 m

x 10-1

x 108

x 10-14

x 10-3

x 10-2

x 10-2

x106

K+ momentum [GeV/c]

(2 RMS)

800 MHz(/K/p)

Solo i rivelatori upstream sono esposti a 800 MHz di fascio (8.6% K) …

10 MHz Kaon decays

K+ +

1.51.5

G. Ruggiero 1 Sett. 2005 CambridgeG. Ruggiero 1 Sett. 2005 Cambridge

Background kinematically constrained

Decay BR

K2 0.634

+0 0.211

++- (00)

0.070

92% of total background+0 forces us to split the signal region

G. Ruggiero 9/1/2005 CambridgeG. Ruggiero 9/1/2005 Cambridge

Background not kinematically constrained

Decay BRKKe3e3 0.049

KK33 0.033

KK22 5.5×10-3

++00 1.5×10-3

KKe4e4 4×10-5

KK44 1×10-5

8% of total background Spoils the signal region

Background rejection

Goal of P326: S/B ≈ 10 ~1012

rejection

2-steps background rejection:1) Kinematical rejection

Region I: 0 < m2miss < 0.01 GeV2/c4

Against K2, +0

Region II: 0.026 < m2miss < 0.068 GeV2/c4

Against +0, ++, +00

2) Veto and Particle ID, , charged particles

– e separation


Sources of background

Kinematical rejection inefficiencyResolution effectsNon gaussian tailsBeam pile – up

Veto and particle ID inefficiencyRICH – veto – veto

Simulation (Jurgen)

Simulation (Oleg)

Parameterization (Simulation in progress by Rome)(Data in progress: LKr by NA48/2, ANTI by Frascati)

Simulated using FlyoSimulated using GEANT4Simulated using Flyo

Resolutions (Flyo MC)Gigatracker

300 x 300 m pixels0.4% X0 per SpibesSimple reconstruction2% inefficiency per station

Double Spectrometer

80m resolution in X and Y hits (125 m per view)0.5% X0 per chamberTrack momentum from fitAngle from first 2 chambersFully efficient

+0 m2miss

resolution

PK

K

Ptrack

K

Results: (PK)/PK = 4.2 x 10-3

(K) = 16.7 rad

(P)/P = 0.23% + 0.005% P (GeV/c) (K) = 60 – 20 rad (P = 10 – 50

GeV/c)

Not gaussian tails (GEANT4)Simulation:

Toy simulation of the Double Spectrometer, based on GEANT4Interactions:

Electromagnetic, Hadronic

Reconstruction:Average material 0.5% X0 (no straws geometry)-ray production allowedNo digitization, coordinates smeared with gaussians

Effects:Tails in the reconstructed momentum and angle: smearing of the m2

miss

Spoiling of the rejection power for the kinematical constrained background

+0 30-35 GeV/c

Approximation: Non gaussian effects in

the Gigatracker not taken into account

Beam pile-up (Flyo)

Simulation: Accidental track superimposed in

Gigatracker to the kaon track Accidental track generated according to

the beam momentum bite, dimension and divergence Rate: 800 MHz SPIBES: time resolution 200 ps,

inefficiency 2% HODOSCOPE: time resolution 80 psEffect:

The downstream track can be matched with the wrong track: danger expecially for

Analysis: Only upstream tracks within 500 ps from

the downstream track are considered “good” upstream tracks: 32% of events have >1 good track in Giga Track choice based on 2 from T and CDA About 1.7% of events matches the wrong

track

Veto and particle ID

RICH (Simulation by Jurgen):

17 m long, 1.0 atm Ne

– Veto (Simulation by Oleg):

-veto = 105

E range Inefficiency

ANTI< 50 MeV 1

(0.5, 1) GeV 104

> 1 GeV 105

LKR

< 1 GeV 1

(1,3) GeV 104

(3,5) GeV 104 105

> 5 GeV 105

IRCs,

SAC

All 106

– Veto: inefficiency parameterization

JURGEN

Selection (1)Number of tracks

1 positive downstream track (hit in all the 6 chambers)Choice of the upstream track using minimum 2 (prev. slide)

Detector geometryDownstream track inside of the detector acceptance:

Straws: 10 cm < Rtrack < 85 cm (centered on the hole of the chamber)

RICH: 12 cm < Rtrack < 120 cm (both on front and back surfaces)

LKr: Octagonal outer shape and Rtrack > 15 cm

MAMUD: square shape, 260x260 cm outer, 36x30 cm inner (front and back)

Particle IDNot muons in RICH or MAMUDNot electrons in RICH or LKr (LKr with 10-3 inefficiency of e – ID)

Selection (2)

Fiducial decay region5 m < Zvertex < 65 m (from the final collimator, Zvertex defined as the Z coordinate of the point closest to both the tracks)

Specific cutsPtrack/Ptrack < 2.5×(P)/P (against the not gaussian tails)

CDA < 0.8 cm (against the tails from the beam pile – up)

KinematicsREGION I: 0 < m2

miss < 0.01 GeV2/c4

REGION II: 0.026 < m2miss < 0.068 GeV2/c4

Cut on momentum15 GeV/c < Ptrack < 35 GeV/c

Some remarks

Fiducial decay region: 60 m (5m < Zvertex < 65 m)

Kaon Flux: 4.8×1012 decay/year in the fiducial region

Detector Layout described in the proposal:Straw chambers 5cm inner radius displaced in x according to the positive beam deflection in the spectrometerMagnets of the double spectrometer:

MNP33 – 1 Ptkick = 270 MeV/c

MNP33 - 2 Ptkick = -360 MeV/c

All the expected background given per 1 year of data taking

+0

Acceptance after all the cuts: Acc = (1.3 ± 0.1) × 104

Assumption: independence between kinematical rejection inefficiency (kin) and selection acceptance

NI,II = kin×Nsel(Flyo)+Npileup(Flyo)

NI,II = Number of expected events in regions I and II after all the cuts

Nsel(Flyo) = number of events selected in Flyo before the cut on m2miss

Npileup(Flyo) = number of events in Regions I and II due to the beam pileup

Acc = NI,II / Ngen(Flyo)

Expected events:N(+0) = kaon × BR × Acc × (0) = (2.7 ± 0.2) / year– Region I: 1.7 / year– Region II: 1.0 / year– Nngaus ~ 0.5 / year, Npileup ~ 2.2 / year

Photon veto inefficiency:(0) = 2 × 108

Acceptance after all the cuts: Acc=(8 ± 2) × 106

Same procedure as for +0 to extract the acceptance

Expected events:N(K2) = kaon × BR × Acc × Rich() × MAMUD() = (1.2 ±

0.3) / year– Region I: 1.1 / year– Region II: <0.1 / year– Nngaus ~ 0.4 / year, Npileup ~ 0.8 / year

Muon veto inefficiency:MAMUD() = 105 (MAMUD)

RICH() = 5 × 103 (RICH) (conservative)

Assumption: MAMUD and RICH rejection inefficiencies independent

Two body background vs Spibes performances

K2 K2

+0+0

TotalTotal

Spibes ineff(t) Spibes ns

2 body background events 2 body background events

Other backgrounds

Ke3:Acceptance ~12% (Flyo)0 ~ 3×108

Positron ID: LKr × RICH < 103 × 103 (conservative)

NEGLIGIBLE

K3:Acceptance ~17% (Flyo)0 ~ 3×108

Muon ID: RICH × MAMUD < 105 × 102 (conservative)

NEGLIGIBLE

+00:High suppression from kinematics and vetoNEGLIGIBLE

Signal Acceptance

Selection applied on events generated with FF (from CMC)

Effects not taken into account:Random vetoAccidental loss due to hit multiplicity cutsStraw inefficiencyLoss due to cuts in MAMUD for muon ID

BR(+)=8×1011 (SM)

Signal Acceptance

ResultsREGION I: (4.10 ± 0.03) × 10-2

REGION II: (12.88 ± 0.05) × 10-2

Total: (16.98 ± 0.06) × 10-2

Acceptance normalized in the region: 5 m < Zvertex < 65 m

Most important cutsNtrack=1: cuts 8% of events

Geometry: cuts 10% of eventsMomentum: cuts 50% of eventsPile – Up: cuts 12% of events

Signal and backgrounds / year

Total Region I Region II

Signal ~65 ~16 ~49

+0 2.7±0.2 1.7±0.2 1.0±0.1

K2 1.2±0.3 1.1±0.3 <0.1

Ke4 2±2 negligible 2±2++ and 3-

tracks 1±1 negligible 1±1

+0 1.3±0.4 negligible 1.3±0.4

K2 0.4±0.1 0.2±0.1 0.2±0.1Ke3,

K3 ,othersnegligible

Total bkg 9±3 3.0±0.2 6±3

Results: S/B

S/B (Total) = 7.6 ± 2.0S/B (Region I) = 5.2 ± 1.1S/B (Region II) = 8.9 ± 3.6

Some S/B dependence on detector parametersuncorrelated errors

80 ns 200 ns 2%

Hodo time resolution Spibes time resolution Spibes inefficiency

Tentative sharing of construction responsibility (sept. 05)

Beam Line (CERN) CEDAR (CERN) GIGATRACKER (CERN, INFN, Saclay [kabes]) VACUUM TANK (Common fund) ANTI Counters (INFN) STRAW TRACKER (DUBNA, MAINZ) MNP33/2 (Common Fund) CHOD (INFN) RICH (US? + Mexico) LKR (CERN+INFN) MAMUD (INR+Protvino) SAC + IRC (Sofia) Trigger & DAQ (CERN+INFN+?)


Element Cost (MCHF) Comments

BEAM LINE 0.4 Modified K12 line

CEDAR 0.5 Replacement of photon detectors

GIGATRACKER 2.7 (1.4) Assuming 0.13 m CMOS technology

VACUUM 1.0 Addition of 20 large diffusion pumps

ANTI 4.2 (4.2) CKM estimate + 40% for the electronics

STRAW TRACKER 2.4 6 straw chambers

MNP33/2 2.5 (1170 + prolongation of He tank)

CHOD 0.9 (0.9) MGG-RPC

LKR 2.0 !!! New supervision system and R/O

RICH 4.0 Indication

MAMUD 1.5 Cost of iron ≈0.5 MCHF

SAC, IRC1 & IRC2 0.4 Shashlik or PbWO4

Trigger & DAQ 1.5 (0.7) L0 HW, L1 SW

TOTAL 24.0 (7.2)

Gigatracker 0.7-1.0 M€ (assumendo 50% sharing)

Anticounters 2.8-3.4 M€

Chod 0.5–0.7 M€

Trigger 0.5-0.8 M€ (assumendo 40% sharing)

TOTALE 4.5-5.9 M€TOTALE 4.5-5.9 M€

(Nella proposta sono quotati 7.2 MCHF = 4.8 M€ )(Nella proposta sono quotati 7.2 MCHF = 4.8 M€ )

Il 27 settembre, verrà presentata all’SPSC una Il 27 settembre, verrà presentata all’SPSC una richiesta di 30 gg di run per il 2006 sulla solita linea di fascio richiesta di 30 gg di run per il 2006 sulla solita linea di fascio K12 principalmente perK12 principalmente per

- misurare l’inefficienza di osservazione dei fotoni con il LKr- misurare l’inefficienza di osservazione dei fotoni con il LKr

- misurare il BKGR da pi/k interagenti con il gas residuo- misurare il BKGR da pi/k interagenti con il gas residuo

- determinare l' alone del fascio- determinare l' alone del fascio

- effettuare i tests necessari sui prototipi dei nuovi rivelatori - effettuare i tests necessari sui prototipi dei nuovi rivelatori (Cedar, hodo, sensori gigatracker …)(Cedar, hodo, sensori gigatracker …)

Nella riunione di Cambridge, lo Steering Committee haNella riunione di Cambridge, lo Steering Committee hadefinito in 93.5 kCHF il Common Fund 2006 di NA48/2.definito in 93.5 kCHF il Common Fund 2006 di NA48/2.

Sulla base del MoU esistente, questo significherebbe Sulla base del MoU esistente, questo significherebbe 93.5*0.3 = 28.05 KCHF 93.5*0.3 = 28.05 KCHF ≈ 19. Keuro (1euro=1.5CHF)≈ 19. Keuro (1euro=1.5CHF)

Common Fund 2006

Richiesti nei moduli 15kRichiesti nei moduli 15k

Nella riunione di Cambridge, lo Steering Committee haNella riunione di Cambridge, lo Steering Committee hadefinito in 165.5 kCHF le spese da sostenere in comunedefinito in 165.5 kCHF le spese da sostenere in comuneper il run 2006, relativo all’R&D di P326.per il run 2006, relativo all’R&D di P326.

Nell’ipotesi di 1/3 a carico INFN, questo significaNell’ipotesi di 1/3 a carico INFN, questo significa165.5/3 = 55.2 KCHF 165.5/3 = 55.2 KCHF ≈ 37.0 Keuro (1euro=1.5CHF)≈ 37.0 Keuro (1euro=1.5CHF)

P326 Run Operating expenditures in 2006

Richiesti nei moduli 20k + 20k (Pool) = 40kRichiesti nei moduli 20k + 20k (Pool) = 40k

Il sistema attuale è obsoleto e non più supportato e richiede già da Il sistema attuale è obsoleto e non più supportato e richiede già da tempo la sua sostituzione, anche perchè la persona che, comunque,tempo la sua sostituzione, anche perchè la persona che, comunque,lo conosceva, è ormai in pensione da tempo. Abbiamo rimandato lo conosceva, è ormai in pensione da tempo. Abbiamo rimandato fino a che è stato possibile, ma ormai l’operazione è divenuta fino a che è stato possibile, ma ormai l’operazione è divenuta

improcrastinabile improcrastinabile per ragioni di sicurezza dell’apparato.

Per passare al nuovo sistema supportato al CERN per LHC, il costo Per passare al nuovo sistema supportato al CERN per LHC, il costo Previsto (hardware + man-power) è di 500 kCHF.Previsto (hardware + man-power) è di 500 kCHF.

Date le ristrettezze finanziarie comuni, vorremmo comunque cercare diDate le ristrettezze finanziarie comuni, vorremmo comunque cercare disbloccare la situazione, attraverso un finanziamento straordinario ad hoc sbloccare la situazione, attraverso un finanziamento straordinario ad hoc

dell’INFN di dell’INFN di 150 k€150 k€ . .

SPARESSPARES

CERN, 7 Settembre 2005 Conference room 40-R-B10 09:30 Iacopini:Introduzione 10:30 Fantechi Status...

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