SLIDE 1
Sensitivity of T2HKK to non-standard interaction Monojit Ghosh - - PowerPoint PPT Presentation
Sensitivity of T2HKK to non-standard interaction Monojit Ghosh - - PowerPoint PPT Presentation
Sensitivity of T2HKK to non-standard interaction Monojit Ghosh Tokyo Metropolitan University Tokyo, Japan 1st Workshop on 2nd HK Detector in Korea Seoul National University, Seoul, Korea November 21-22, 2016 Based on: Fukasawa, Ghosh,
SLIDE 2
SLIDE 3
The T2HKK experiment
T2HK experiment 190+190=380 kt detector at Kamioka, L=295 km, 2.5◦ off-axis beam T2HKK experiment 190 kt detector in Korea, 190 kt detector in Kamioka with L (km)
- ff-axis (degree)
1088 1.3 1100 1.5 1100 2.0 1100 2.5
SLIDE 4
Probability and flux
0.04 0.08 0.12 0.16 0.2 1 2 3 Pµe/Flux E (GeV) Neutrino L=295 km L=1100 km OA 1.3 OA 1.5 OA 2.0 OA 2.5 0.02 0.04 0.06 1 2 3 Pµe/Flux E (GeV) Anti-neutrino L=295 km L=1100 km OA 1.3 OA 1.5 OA 2.0 OA 2.5
- Flux peaks at highest energy for 1.3◦ and lowest energy for
2.5◦
- Flux height is maximum for 2.5◦ and minimum for 1.3◦
- 2.0◦ and 2.5◦ cover only 2nd maxima while 1.3◦ and 1.5◦
cover part of the 1st maxima
SLIDE 5
What is non-standard interaction ?
Neutrino propagating in matter
- Standard NC interaction:
να + f → να + f
- Non-standard NC interaction
να + f → νβ + f can arise from the following four-fermion interaction L = −GFǫf
αβ¯
ναγµνβ¯ f γµf with ǫαβ =
f =e,u,d Nf Ne ǫf αβ
SLIDE 6
NSI in neutrino oscillation
- Evolution equation with standard oscillation
i d dt
- νe
µµ ντ
- =
- Udiag(E1, E2, E3)U−1 +
- A
- νe
µµ ντ
- evolution equation with non-standard oscillation
i d dt
- νe
µµ ντ
- =
- Udiag(E1, E2, E3)U−1 + A
- 1 + ǫee
ǫeµ ǫeτ ǫ∗
eµ
ǫµµ ǫµτ ǫ∗
eτ
ǫ∗
µτ
ǫττ
- νe
µµ ντ
- with A =
√ 2GFNe
SLIDE 7
Analysis
Bounds
|ǫee| < 4 × 100, |ǫeµ| < 3 × 10−1, |ǫeτ | < 3 × 100 , |ǫµµ| < 7 × 10−2 |ǫµτ | < 3 × 10−1, |ǫττ | < 2 × 101 , ǫττ = |ǫeτ |2 1 + ǫee .
Ansatz
A = √ 2GF Ne
- 1 + ǫee
ǫeτ ǫ∗
eτ
|ǫeτ |2/(1 + ǫee)
- Free Parameters: ǫee, |ǫeτ |, φ31 = arg(ǫeτ )
θ23 = 45◦ δCP = −90◦
Objective
Study the sensitivity of T2HKK and comparison with DUNE and HK (atmospheric)
SLIDE 8
Specification
T2HKK
- 280 kt in Kamioka and 280 kt in Korea
- 1.3 MW beam, 15.6 × 1021 pot: 15.6 years of running
- Events calculated as per latest available T2HK configuration
and then scaled for the Korean detector
- ν : ¯
ν = 1 : 1, systematics: 3.3% for ν and 4.2% for ¯ ν DUNE
- 1.2 MW beam, 10 × 1021 pot: 10 years of running
- 35 kt Liquid Argon detector
- ν : ¯
ν = 1 : 1, systematics: 5% for both ν and ¯ ν HK(atm)
- 15 years of running
- 560 kt WC
SLIDE 9
Bounds on ǫee and |ǫeτ|
0.2 0.4 0.6 0.8
- 4
- 3
- 2
- 1
1 2 3 4 NH (εee,εeτ)=(0,0) |εeτ| εee 3σ 1.3 OA 1.5 OA 2.0 OA 2.5 OA DUNE HK 0.2 0.4 0.6 0.8
- 4
- 3
- 2
- 1
1 2 3 4 IH (εee,εeτ)=(0,0) |εeτ| εee 3σ 1.3 OA 1.5 OA 2.0 OA 2.5 OA DUNE HK 0.5 1 1.5
- 4
- 3
- 2
- 1
1 2 3 4 |εeτ| εee T2HK, 3σ NH IH
- T2HKK is far more powerful than T2HK
- For T2HKK, sensitivity is best for 1.3◦
- Sensitivity of 1.3◦ and DUNE is similar in NH but DUNE is
better in IH
- HK(atm) is the best
SLIDE 10
Excluding (ǫee, |ǫeτ|)=(0.8,0.2)
2 4 6 8 10 2 4 6 8 10 12 14 True NH (εee,εeτ)=(0.8,0.2) χ2 Run time Exclusion OA 1.3 OA 1.5 OA 2.0 OA 2.5 DUNE HK 2 4 6 8 10 2 4 6 8 10 12 14 True IH (εee,εeτ)=(0.8,0.2) χ2 Run time Exclusion OA 1.3 OA 1.5 OA 2.0 OA 2.5 DUNE HK 0.1 0.2 0.3 0.4 0.5 2 4 6 8 10 12 14 T2HK (εee,εeτ)=(0.8,0.2) χ2 Run time Exclusion NH IH
- T2HKK is far more powerful than T2HK
- For T2HKK, sensitivity is best for 1.3◦
- Sensitivity of DUNE and HK(atm) is better than T2HKK
SLIDE 11
Events
Why 1.3◦ is better than others ?
- ff-axis (degree)
1.3◦ 1.5◦ 2.0◦ 2.5◦ ν 515 438 368 309 ¯ ν 39 34 25 17
Conclusion
1.3◦ is better due to the maximum number of events as compared to the other off-axis setups
SLIDE 12
Sensitivity to the CP phases
- 180
- 120
- 60
60 120 180
- 180
- 120
- 60
60 120 180 NH (εee,εeτ)=(0.8,0.2) φ31(Test) δCP(Test) 90% C.L. 1.3 OA 1.5 OA 2.0 OA 2.5 OA DUNE HK
- 180
- 120
- 60
60 120 180
- 180
- 120
- 60
60 120 180 IH (εee,εeτ)=(0.8,0.2) φ31(Test) δCP(Test) 90% C.L. 1.3 OA 1.5 OA 2.0 OA 2.5 OA DUNE HK
- True value of NSI: (ǫee, |ǫeτ|)=(0.8,0.2)
- CP sensitivity of T2HKK is better than DUNE
SLIDE 13
But why ?
Because of two-detector setup
- 180
- 120
- 60
60 120 180
- 180
- 120
- 60
60 120 180 NH (εee,εeτ)=(0.8,0.2) φ31(Test) δCP(Test) 1.3 OA, 90% C.L. Kamioka Korea Combined Kamioka(εαβ known)
- 180
- 120
- 60
60 120 180
- 180
- 120
- 60
60 120 180 IH (εee,εeτ)=(0.8,0.2) φ31(Test) δCP(Test) 1.3 OA, 90% C.L. Kamioka Korea Combined Kamioka(εαβ known)
- Detector at Korea (matter effect) measures ǫαβ while the
detector at Kamioka (high statistics) measures the CP phases
Comment
The two detector setup of T2HKK is advantageous for determining CP phases
SLIDE 14
Summary
- In comparison to T2HK, T2HKK is far superior in
constraining the NSI parameters
- Among the possible configurations of T2HKK, 1.3◦ is best
- The two detector setup of T2HKK is advantageous over
DUNE for determining the CP phases
- The sensitivity of HK(atm) is best among all the setups under
consideration (except measuring CP phases in IH)
SLIDE 15
Summary
- In comparison to T2HK, T2HKK is far superior in
constraining the NSI parameters
- Among the possible configurations of T2HKK, 1.3◦ is best
- The two detector setup of T2HKK is advantageous over
DUNE for determining the CP phases
- The sensitivity of HK(atm) is best among all the setups under