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ORKA at Fermilab: Seeking New Physics with Measurements Seeking New Physics with Measurements of the "Golden Kaon" Decay K of the Golden Kaon Decay K Douglas Bryman University of British

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SLIDE 1

ORKA at Fermilab: Seeking New Physics with Measurements Seeking New Physics with Measurements

  • f the "Golden Kaon" Decay K

 

 

  • f the Golden Kaon Decay K

  

Douglas Bryman University of British Columbia

April 25, 2013 Argonne Intensity Frontier Workshop

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SLIDE 2

Precision Flavor Physics in the LHC Era

A small set of crucial rare particle decays extremely sensitive to new physics at high mass scales

High precsion measurments of the ultra-rare K  

Q(L) Flavor Processes to Study NP

p y g 1(2)

  • e Conversion,

, ( )

Q( ) y

e eee K e      

 

   ( ) , 3(3) , B , ... 2

L

K K b s        

 

     ( ) , ,   

Discoveries of new physics at the LHC and elsewhere will require a range of

2

p y q g precision flavor physics experiments to home in on the new interpretation.

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SLIDE 3

in the Standard Model K  

 

The decays are the most precisely predicted FCNC decays . K  

A single effective operator Dominated by top quark

μ L L L μ L

(s γ d )(ν γ ν )

CERN-ESG-005

(charm significant, but controlled) Hadronic matrix element shared with Ke3

Remain clean in most New Physics models

  • 11

SM

B ( ) = (7.8 ± 0.8) x 10 K  

 

Expect total SM theory error ≤6%.

  • 11

SM

B ( ) = (2.43 ± 0.39) x 10

L

K   

30% deviation from the SM would be a 5 signal of NP

  • J. Brod, M. Gorbahn, E. Stamou PRD83,034030(2011)
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SLIDE 4

: High Sensitivity to New Physics K  

B( ) vs. B( )

L

K K    

 

 

High mass scale effects, Warped Extra Dimensions as a Theory of Flavor, Z’, …??

'

' ( 5 30 )

Z

Z m TeV  

11

→π0νν)x101

SM

Br(K0

L→

11

( ) 10 Br K x  

 

4

  • D. M. Straub, arXiv:1012.3893

Buras, De Fazio, Girrbach arXiv:1211.1896

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SLIDE 5

Kamenik and Smith (2012) ( )

“FCNC portals to the dark sector” Dark Sector Decays / compete K B XX    Dark Sector Decays / compete with SM Decays / K B XX K B    

6 2 2 4 2 2

16

n I tI tJ n

m g g V V M

  

Operator Dimensional

4 2 2

16

tI tJ n W

M  

Analysis K decays Highly sensitive for low dimension for low dimension

  • perators

link.springer.com/content/pdf/10.1007/JHEP03(2012)090

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SLIDE 6

Challenges for Measuring K  

 

( ) 64% K   

 

21% K  

 

  • 11

SM

B ( ) = (7.8 ± 0.8) x 10 K  

 

Experimentally weak signature: backgrounds exceed signals by >1010

I II

  • Determine everything possible about the K and p

exceed signals by 10

  • ฀p+/µ+ particle ID better than 106 (p +→ µ + → e+ )
  • Work in the CM system (stopped K+)
  • Eliminate events with extra charged particles or photons
  • * ฀ p0 inefficiency < 10-6
  • Suppress backgrounds well below the expected signal (S/N~10)
  • * Predict backgrounds from data: dual independent cuts

6

  • * Use “Blind analysis” techniques
  • * Test predictions with outside-the-signal-region measurements
  • Evaluate candidate events with S/N function
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SLIDE 7

BNL E949 – 3nd generation

Stop 700 MeV/c K Scintillating fiber tgt.

RS Momentum in DC Energy, range in RS e   

 

DC

RS

6 6

10 suppression 4 Photon Veto >10 suppression     PV

Photon Veto

4 Photon Veto

pp

 

  e  Decay Sequence

  e   

  e  Decay Sequence

  e 

Veto Additional Charged Tracks Veto Additional Charged Tracks

7

e

500 MHz digitizers

    e      e 

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SLIDE 8

Background Suppression: E949 Extreme Photon Detection Efficiency

Rejection vs. Acceptance

0 R j

i 10 10

6 7

j p

0 Rejection: >10

10

6 7

 

  • E949

Possibly the most efficient photon detector built so far.

  • E787

VPI&SU 8

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SLIDE 9

11

Veto and Kinematics (P,R,E...) Background Suppression: 21% <10 Dual cuts:   

  

  K Veto Reversed Veto Applied Range vs. Energy Mome m ntu  

  • Max. veto

Check for correlations

slide-10
SLIDE 10

10

Pion Range vs. Energy

10

(0.78+-0.08)

10

slide-11
SLIDE 11

Experiments History

L

K    pe e ts sto y

L

  

8

2.6 10 x

11

  • J. Ma 2011
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SLIDE 12

Emerging Measurements K  

75 GeV Kaon Decays-in-flight

at CERN K  

 

Proton beam from SPS

  • Builds on NA-31/NA-48
  • Un-separated GHz beam

12

  • Aim: 40-50 events/yr at SM
  • Under construction; start 2013
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SLIDE 13

8 5

Rejection goal: 10 Rejection goal: 10  

13

2

Rejection goal: 10 Rejection goal: 10 / RICH separation up to 35 GeV/c Beam tracking: 40 MHz/cm    

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SLIDE 14

at J-PARC

L

K   

8

Impoved setup based on KEK E391a ( 2.6 10 ) x

  • Improved J-PARC Beam line
  • Upgraded Detector
  • 100 x proton intensity
  • Aim: few events (S/B~1) at SM

14

( )

  • Under construction; start 2013
  • J. Ma 2011
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SLIDE 15

Expected Photon Veto Performance

CsI Calorimeter: t (50 MeV)~500ps 

Principal background:

L

K   

  • J. Ma 2011, T. Yamanaka 2012
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SLIDE 16

ORKA at Fermilab ORKA at Fermilab

  • 17 institutes in six countries: Canada, China, Italy, Mexico, Russia, USA
  • Six US universities
  • Two US National Laboratories
  • Leadership from previous BNL and FNAL US rare kaon decay experiments
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SLIDE 17

th

ORKA at the FNALMain Injector 4 Generation Experiment K  

 

Incremental Improvements

4 Generation Experiment K   

p

  • 600 MeV/c
  • K stopping

rate x5 with bl comparable instantaneous rate

  • Larger solid angle
  • Acceptance x 10

p

  • Fine segmentation,

improved resolutions

Reduced backgrounds: <5% precision

30% deviation from the SM

g p Overall, >100 x sensitivity

would be a 5 signal of NP

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SLIDE 18

ORKA at Fermilab

Main Injector Slow Spill 75 KW 95 GeV/c 44% duty factor (10 s cycle, 4.4 s spill) CDF(B0) collision hall: Existing tunnels and hall, Rad hard, adequate space, existing superconducting magnet superconducting magnet, A0->B0 beamline needed; (required interplay with IARC)

18

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SLIDE 19
  • The ORKA new

detector payload replaces the CDF tracker volume.

E949 Central tracker (similar diameter to ORKA)

19

slide-20
SLIDE 20
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SLIDE 21

Kaon Beamline Design

600 MeV/c separated K beam (K/π~4) Measure kaon decays at rest.

95 GeV Protons

7

10 / 44% . . K s D F

  • T. Kobilarcik, D. Jensen (FNAL), et al.

G4Beamline studies

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SLIDE 22

Evolution to 4th Generation Detector

  • &

underway on detector refinements R D

  • Simulations studies

y

  • Efficient photon detectors
  • Adriano (INFN), Shashlyik
  • Solid state photo-sensors -- SiPMs
  • ILCroot framework established
  • Range stack segmentation and readout
  • Photon veto geometry and function
  • Target segmentation and readout
  • Range stack tracking -- GEM
  • Low mass drift chamber design

g g

  • Drift chamber parameters
  • Kaon beam line: G4Beamline
  • Preliminary engineering concepts
  • Detector support in CDF magnet
  • Installation issues
  • Power, cooling and cabling issues
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SLIDE 23

ILCroot Simulations ILCroot Simulations

BNL/FNAL/INFN/TRIUMF-UBC

slide-24
SLIDE 24

ORKA Detector improvements

Incremental increases in signal acceptance based largely on E787/E949 measurements. Additional acceptance gains expected from trigger improvements.

24

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SLIDE 25

 

  e  Decay Sequence

 

  e  Decay Sequence

  e    e 

25

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SLIDE 26

ORKA

 

  e  Decay Sequence

 

  e  Decay Sequence

ORKA

    e      e 

26

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SLIDE 27

ORKA ORKA ORKA

K Decay Time K Decay Time

ORKA

K 

2 ns

  K 

2 ns

 

1 ns

27

2 ns 2 ns

1 ns

slide-28
SLIDE 28

 

  Kinematics

 

  Kinematics

ORKA

 

 

ORKA ORKA

28

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SLIDE 29

Scintillating Fiber Target

E949 3.1 m long, single ended readout ORKA 1 m long, double ended readout, SiPMs Acceptance Increase: 1.06±0.06

Beam Instrumentation Beam Instrumentation

MPPC

  K

K

Target Instrumentation

K

Target Instrumentation

MPPC

Target Fibers

29

slide-30
SLIDE 30

Photon Veto Improvements E949 1 7.3 Radiation Lengths ORKA 23 0 R di ti L th

0.39 0.18

ORKA 23.0 Radiation Lengths Acceptance Increase : 1.65

Estimate based on simulated KOPIO PV performance Adjusted to agree with E949 PV efficiency.

Shashlyk – Calorimeter Candidate for ORKA

30

slide-31
SLIDE 31

Shashlyk Beam Measurements

Simulation: Combined Energy Resolution

2.7%   ( ) E GeV  

slide-32
SLIDE 32

Comparison of ORKA and Comparison of ORKA and BNL E949

E949 ORKA Pp (GeV/c) 21.5 95 Duty Factor (%) 41 44 PK (MeV/c) 710 600 Fraction of kaons that Fraction of kaons that stop in target (%) 21 54 Average rate of stopping kaons/s (106) 0 69 4 78 kaons/s (106) 0.69 4.78 Accidental loss (%) 23 28 Events/yr (SM) 1 3 210 Events/yr (SM) 1.3 210

1050 Events at SM→<5% precision

slide-33
SLIDE 33

ORKA Sensitivity vs Time ORKA Sensitivity vs. Time

ORKA

1050 Events at SM

33

slide-34
SLIDE 34

Selected ORKA Physics Opportunities

E787/E949: 42 publications 26 Theses E787/E949: 42 publications, 26 Theses KTEV: 50 publications, 32 Theses

slide-35
SLIDE 35

Prospects K  

K   

K  

 

L

K   

8

B( ) 2.6 10

:

L

K x

Now

 

 

1.15 10 1.05

: B( ) 1.73 10 (7 t ) Now K x  

    

 

K   

Goals KOTO* Proj X  

11

: Sensitivity at SM 2.5 .4 10 Future x

Goals NA62

ORKA Proj X

10

(7 events) : Sensitivity at SM (0.78 0.08) 10 Future x

Goals KOTO* J-PARC Proj.X

FNAL Events/yr

1 “200”

Goals NA62

CERN

ORKA Proj.X FNAL

Events/ 50

210 500

Events/yr ~1

“200” S/N ~1 5-10

yr

50 500 S/N 5 5 5

Precision

5%

Precision 10%

5% 3%

35

* J-PARC plans a phase II to reach higher sensitivity. >30% deviation→ >5 signal of NP