Measurement of the Weinberg angle with low-energy beta-beams

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1 Outline Measurement of the Weinberg angle with low-energy beta-beams University of Wisconsin-Madison, U.S.A. International Workshop on Fundamental Symmetries: From Nuclei and Neutrinos to the Universe ECT* Trento, Italy, June 27, 2007

2 Outline Outline 1 The beta-beam concept 2 Low-energy beta-beams 3 Measuring the 4 Conclusions

3 Outline Outline 1 The beta-beam concept 2 Low-energy beta-beams 3 Measuring the 4 Conclusions

4 Outline Outline 1 The beta-beam concept 2 Low-energy beta-beams 3 Measuring the 4 Conclusions

5 Outline Outline 1 The beta-beam concept 2 Low-energy beta-beams 3 Measuring the 4 Conclusions

6 The beta-beam concept Original idea by P. Zucchelli, Phys. Lett. B 532 (2002): Pure, collimated, well-known neutrino fluxes can be obtained by boosted ions decaying through beta-decay

7 The beta-beam concept Zucchelli, Phys. Lett. B 532 (2002); Autin et al., J. Phys. G 29 (2003) Strong synergy with EURISOL Use CERN existing accelerator Need for a decay ring

8 The beta-beam concept Zucchelli, Phys. Lett. B 532 (2002); Autin et al., J. Phys. G 29 (2003) Strong synergy with EURISOL Use CERN existing accelerator Need for a decay ring

9 The beta-beam concept Zucchelli, Phys. Lett. B 532 (2002); Autin et al., J. Phys. G 29 (2003) Strong synergy with EURISOL Use CERN existing accelerator Need for a decay ring

10 The beta-beam concept Zucchelli, Phys. Lett. B 532 (2002); Autin et al., J. Phys. G 29 (2003) Strong synergy with EURISOL Use CERN existing accelerator Need for a decay ring

11 The beta-beam concept 440 kton H 2 O Čerenkov detector to study CP and T violation through ν oscillations but also supernova neutrinos and proton decay.

12 The beta-beam concept 440 kton H 2 O Čerenkov detector to study CP and T violation through ν oscillations but also supernova neutrinos and proton decay.

13 The beta-beam concept 440 kton H 2 O Čerenkov detector to study CP and T violation through ν oscillations but also supernova neutrinos and proton decay.

14 The beta-beam concept CP-violation phase and θ 13 Explore θ 13 1 and δ 20. M. Mezzetto, Talk at NUFACT05, June 2005, Rome Different regimes Standard γ = 100 High-energy γ >> 100 Low-energy γ = 5 14

15 The beta-beam concept CP-violation phase and θ 13 Explore θ 13 1 and δ 20. M. Mezzetto, Talk at NUFACT05, June 2005, Rome Different regimes Standard γ = 100 High-energy γ >> 100 Low-energy γ = 5 14

16 The beta-beam concept CP-violation phase and θ 13 Explore θ 13 1 and δ 20. M. Mezzetto, Talk at NUFACT05, June 2005, Rome Different regimes Standard γ = 100 High-energy γ >> 100 Low-energy γ = 5 14

17 The beta-beam concept CP-violation phase and θ 13 Explore θ 13 1 and δ 20. M. Mezzetto, Talk at NUFACT05, June 2005, Rome Different regimes Standard γ = 100 High-energy γ >> 100 Low-energy γ = 5 14

18 The beta-beam concept CP-violation phase and θ 13 Explore θ 13 1 and δ 20. M. Mezzetto, Talk at NUFACT05, June 2005, Rome Different regimes Standard γ = 100 High-energy γ >> 100 Low-energy γ = 5 14

19 Low-energy beta-beams C. Volpe, J. Phys. G. 30 (2004) Ions accelerated in PS (γ = 5 14) Small (L SS 700 m) storage ring Near ( 10 m) 1 kton H 2 O Čerenkov detector 18 Ne 18 F + e + + ν e : (ν e, e ) scattering (ν e, 16 O) capture 6 He 6 Li + e + ν e (ν e, e ) scattering (ν e, 16 O) capture (ν e, 1 H) capture

20 Low-energy beta-beams C. Volpe, J. Phys. G. 30 (2004) Ions accelerated in PS (γ = 5 14) Small (L SS 700 m) storage ring Near ( 10 m) 1 kton H 2 O Čerenkov detector 18 Ne 18 F + e + + ν e : (ν e, e ) scattering (ν e, 16 O) capture 6 He 6 Li + e + ν e (ν e, e ) scattering (ν e, 16 O) capture (ν e, 1 H) capture

21 Low-energy beta-beams C. Volpe, J. Phys. G. 30 (2004) Ions accelerated in PS (γ = 5 14) Small (L SS 700 m) storage ring Near ( 10 m) 1 kton H 2 O Čerenkov detector 18 Ne 18 F + e + + ν e : (ν e, e ) scattering (ν e, 16 O) capture 6 He 6 Li + e + ν e (ν e, e ) scattering (ν e, 16 O) capture (ν e, 1 H) capture

22 Low-energy beta-beams C. Volpe, J. Phys. G. 30 (2004) Ions accelerated in PS (γ = 5 14) Small (L SS 700 m) storage ring Near ( 10 m) 1 kton H 2 O Čerenkov detector 18 Ne 18 F + e + + ν e : (ν e, e ) scattering (ν e, 16 O) capture 6 He 6 Li + e + ν e (ν e, e ) scattering (ν e, 16 O) capture (ν e, 1 H) capture

23 Low-energy beta-beams C. Volpe, J. Phys. G. 30 (2004) Ions accelerated in PS (γ = 5 14) Small (L SS 700 m) storage ring Near ( 10 m) 1 kton H 2 O Čerenkov detector 18 Ne 18 F + e + + ν e : (ν e, e ) scattering (ν e, 16 O) capture 6 He 6 Li + e + ν e (ν e, e ) scattering (ν e, 16 O) capture (ν e, 1 H) capture

24 Low-energy beta-beams C. Volpe, J. Phys. G. 30 (2004) Ions accelerated in PS (γ = 5 14) Small (L SS 700 m) storage ring Near ( 10 m) 1 kton H 2 O Čerenkov detector 18 Ne 18 F + e + + ν e : (ν e, e ) scattering (ν e, 16 O) capture 6 He 6 Li + e + ν e (ν e, e ) scattering (ν e, 16 O) capture (ν e, 1 H) capture

25 Low-energy beta-beams C. Volpe, J. Phys. G. 30 (2004) Ions accelerated in PS (γ = 5 14) Small (L SS 700 m) storage ring Near ( 10 m) 1 kton H 2 O Čerenkov detector 18 Ne 18 F + e + + ν e : (ν e, e ) scattering (ν e, 16 O) capture 6 He 6 Li + e + ν e (ν e, e ) scattering (ν e, 16 O) capture (ν e, 1 H) capture

26 Low-energy beta-beams C. Volpe, J. Phys. G. 30 (2004) Ions accelerated in PS (γ = 5 14) Small (L SS 700 m) storage ring Near ( 10 m) 1 kton H 2 O Čerenkov detector 18 Ne 18 F + e + + ν e : (ν e, e ) scattering (ν e, 16 O) capture 6 He 6 Li + e + ν e (ν e, e ) scattering (ν e, 16 O) capture (ν e, 1 H) capture

27 Low-energy beta-beams C. Volpe, J. Phys. G. 30 (2004) Ions accelerated in PS (γ = 5 14) Small (L SS 700 m) storage ring Near ( 10 m) 1 kton H 2 O Čerenkov detector 18 Ne 18 F + e + + ν e : (ν e, e ) scattering (ν e, 16 O) capture 6 He 6 Li + e + ν e (ν e, e ) scattering (ν e, 16 O) capture (ν e, 1 H) capture

28 Low-energy beta-beams Rich physics program Neutrino-nucleus interactions: J. Serreau and C. Volpe, PRC 70 (2004); A. Bueno, M. C. Carmona, J. Lozano and S. Navas, PRD 74 (2006); Neutrino magnetic moment: G. C. McLaughlin and C. Volpe, PLB 591 (2004); Electroweak tests (this talk): A. B. Balantekin, JHJ and C. Volpe, PLB 634 (2006); CVC tests (next talk): A. B. Balantekin, JHJ, R. Lazauskas and C. Volpe, PRD 73 (2006); Supernova neutrino spectra (tomorrow): N. Jachowicz and G. C. McLaughlin, PRL 96 (2006); Off-axis neutrinos (next talk): R. Lazauskas, A.B. Balantekin, JHJ and C. Volpe, hep-ph/

29 Measuring sin 2 θ W at low-energy beta-beams Figure credits: K. Jungmann APV and Møller scattering consistent with SM prediction; NuTEV anomaly: NC/CC in (ν µ, N) and (ν µ, N) DIS disagrees with the SM prediction by 3σ; Probing sin 2 θ W through additional experiments would be very useful.

30 Measuring sin 2 θ W at low-energy beta-beams Figure credits: K. Jungmann APV and Møller scattering consistent with SM prediction; NuTEV anomaly: NC/CC in (ν µ, N) and (ν µ, N) DIS disagrees with the SM prediction by 3σ; Probing sin 2 θ W through additional experiments would be very useful.

31 Measuring sin 2 θ W at low-energy beta-beams Figure credits: K. Jungmann APV and Møller scattering consistent with SM prediction; NuTEV anomaly: NC/CC in (ν µ, N) and (ν µ, N) DIS disagrees with the SM prediction by 3σ; Probing sin 2 θ W through additional experiments would be very useful.

32 Measuring sin 2 θ W at low-energy beta-beams Figure credits: K. Jungmann APV and Møller scattering consistent with SM prediction; NuTEV anomaly: NC/CC in (ν µ, N) and (ν µ, N) DIS disagrees with the SM prediction by 3σ; Probing sin 2 θ W through additional experiments would be very useful.

33 Measuring sin 2 θ W at low-energy beta-beams C. Volpe, J. Phys. G. 30 (2004) Ions accelerated in PS (γ = 5 14) Small (L 700 m) storage ring Near ( 10 m) 1 kton H 2 O Čerenkov detector 18 Ne 18 F + e + + ν e : (ν e, e ) scattering (ν e, 16 O) capture 6 He 6 Li + e + ν e (ν e, e ) scattering (ν e, 16 O) capture (ν e, 1 H) capture

34 Neutrino-electron scattering dσ (ν,e) dt e ( ) ( ) ( gv 2 + g2 A + gv 2 g2 A 1 T e E ν ) 2 + g V = 1/2 + 2 sin 2 θ W + g A = ±1/2 + Integrating over T e and averaging over the neutrino flux φ ν σ (ν,e) g V (g V + g A ) m e φ ν + 4 ) (gv g2 A + g V g A E ν At low-energy beta-beams, the number of (ν, e) events is N (ν,e) (ions/s) t σ (ν,e)

35 Neutrino-electron scattering dσ (ν,e) dt e ( ) ( ) ( gv 2 + g2 A + gv 2 g2 A 1 T e E ν ) 2 + g V = 1/2 + 2 sin 2 θ W + g A = ±1/2 + Integrating over T e and averaging over the neutrino flux φ ν σ (ν,e) g V (g V + g A ) m e φ ν + 4 ) (gv g2 A + g V g A E ν At low-energy beta-beams, the number of (ν, e) events is N (ν,e) (ions/s) t σ (ν,e)

36 Neutrino-electron scattering dσ (ν,e) dt e ( ) ( ) ( gv 2 + g2 A + gv 2 g2 A 1 T e E ν ) 2 + g V = 1/2 + 2 sin 2 θ W + g A = ±1/2 + Integrating over T e and averaging over the neutrino flux φ ν σ (ν,e) g V (g V + g A ) m e φ ν + 4 ) (gv g2 A + g V g A E ν At low-energy beta-beams, the number of (ν, e) events is N (ν,e) (ions/s) t σ (ν,e)

37 Neutrino-electron scattering dσ (ν,e) dt e ( ) ( ) ( gv 2 + g2 A + gv 2 g2 A 1 T e E ν ) 2 + g V = 1/2 + 2 sin 2 θ W + g A = ±1/2 + Integrating over T e and averaging over the neutrino flux φ ν σ (ν,e) g V (g V + g A ) m e φ ν + 4 ) (gv g2 A + g V g A E ν At low-energy beta-beams, the number of (ν, e) events is N (ν,e) (ions/s) t σ (ν,e)

38 The Weinberg angle at beta-beams N(γ)E 0 (γ) g 2 A m e = 4 3 ( ) [ ga 2 + g2 V + g E(γ) V g A φ(γ) 3 ] 4 m e The slope tells us about sin 2 θ W ; Neutrino flux dependence on γ; N(γ)E 0 (γ) independent of intensity of ions and duration of measurement... σ NE0 depends on those; [ ] Ndata (γ) N exp (γ) 2 χ 2 (f, t) γ t = s σ data (γ) (a.k.a one year) ν (He) : f = ions/s ν (Ne) : f = ions/s

39 The Weinberg angle at beta-beams N(γ)E 0 (γ) g 2 A m e = 4 3 ( ) [ ga 2 + g2 V + g E(γ) V g A φ(γ) 3 ] 4 m e The slope tells us about sin 2 θ W ; Neutrino flux dependence on γ; N(γ)E 0 (γ) independent of intensity of ions and duration of measurement... σ NE0 depends on those; [ ] Ndata (γ) N exp (γ) 2 χ 2 (f, t) γ t = s σ data (γ) (a.k.a one year) ν (He) : f = ions/s ν (Ne) : f = ions/s

40 90 N(γ)E 0 (γ) - g A 2 me [MeV] neutrinos antineutrinos slope g V 2 + ga 2 + gv g A <E ν (γ)>/<φ tot (γ)> - (3/4)m e [MeV]

41 The Weinberg angle at beta-beams N(γ)E 0 (γ) g 2 A m e = 4 3 ( ) [ ga 2 + g2 V + g E(γ) V g A φ(γ) 3 ] 4 m e The slope tells us about sin 2 θ W ; Neutrino flux dependence on γ; N(γ)E 0 (γ) independent of intensity of ions and duration of measurement... σ NE0 depends on those; [ ] Ndata (γ) N exp (γ) 2 χ 2 (f, t) γ t = s σ data (γ) (a.k.a one year) ν (He) : f = ions/s ν (Ne) : f = ions/s

42 Φ tot (E ν ) [MeV -1 s -1 ] γ=7 γ= E ν [MeV]

43 90 N(γ)E 0 (γ) - g A 2 me [MeV] neutrinos antineutrinos γ=7 γ= <E ν (γ)>/<φ tot (γ)> - (3/4)m e [MeV]

44 The Weinberg angle at beta-beams N(γ)E 0 (γ) g 2 A m e = 4 3 ( ) [ ga 2 + g2 V + g E(γ) V g A φ(γ) 3 ] 4 m e The slope tells us about sin 2 θ W ; Neutrino flux dependence on γ; N(γ)E 0 (γ) independent of intensity of ions and duration of measurement... σ NE0 depends on those; [ ] Ndata (γ) N exp (γ) 2 χ 2 (f, t) γ t = s σ data (γ) (a.k.a one year) ν (He) : f = ions/s ν (Ne) : f = ions/s

45 The Weinberg angle at beta-beams N(γ)E 0 (γ) g 2 A m e = 4 3 ( ) [ ga 2 + g2 V + g E(γ) V g A φ(γ) 3 ] 4 m e The slope tells us about sin 2 θ W ; Neutrino flux dependence on γ; N(γ)E 0 (γ) independent of intensity of ions and duration of measurement... σ NE0 depends on those; [ ] Ndata (γ) N exp (γ) 2 χ 2 (f, t) γ t = s σ data (γ) (a.k.a one year) ν (He) : f = ions/s ν (Ne) : f = ions/s

46 N(γ)E 0 (γ) - g A 2 me [MeV] Short measurement duration Low intensity of ions neutrinos antineutrinos <E ν (γ)>/<φ tot (γ)> - (3/4)m e [MeV]

47 N(γ)E 0 (γ) - g A 2 me [MeV] Long measurement duration High intensity of ions neutrinos antineutrinos <E ν (γ)>/<φ tot (γ)> - (3/4)m e [MeV]

48 The Weinberg angle at beta-beams N(γ)E 0 (γ) g 2 A m e = 4 3 ( ) [ ga 2 + g2 V + g E(γ) V g A φ(γ) 3 ] 4 m e The slope tells us about sin 2 θ W ; Neutrino flux dependence on γ; N(γ)E 0 (γ) independent of intensity of ions and duration of measurement... σ NE0 depends on those; [ ] Ndata (γ) N exp (γ) 2 χ 2 (f, t) γ t = s σ data (γ) (a.k.a. one year) ν (He) : f = ions/s ν (Ne) : f = ions/s

49 The Weinberg angle at beta-beams N(γ)E 0 (γ) g 2 A m e = 4 3 ( ) [ ga 2 + g2 V + g E(γ) V g A φ(γ) 3 ] 4 m e The slope tells us about sin 2 θ W ; Neutrino flux dependence on γ; N(γ)E 0 (γ) independent of intensity of ions and duration of measurement... σ NE0 depends on those; [ ] Ndata (γ) N exp (γ) 2 χ 2 (f, t) γ t = s σ data (γ) (a.k.a. one year) ν (He) : f = ions/s ν (Ne) : f = ions/s

50 The Weinberg angle at beta-beams N(γ)E 0 (γ) g 2 A m e = 4 3 ( ) [ ga 2 + g2 V + g E(γ) V g A φ(γ) 3 ] 4 m e The slope tells us about sin 2 θ W ; Neutrino flux dependence on γ; N(γ)E 0 (γ) independent of intensity of ions and duration of measurement... σ NE0 depends on those; [ ] Ndata (γ) N exp (γ) 2 χ 2 (f, t) γ t = s σ data (γ) (a.k.a. one year) ν (He) : f = ions/s ν (Ne) : f = ions/s

51 4 antineutrinos γ=7,12 3 χ σ = 12.3% neutrinos sin 2 θ W

52 4 γ=12 γ=7,12 3 γ=7,8,9,10,11,12 χ % 12.3% 7.1% sin 2 θ W

53 4 γ=12 γ=7,12 3 γ=7,8,9,10,11,12 χ % 12.3% 7.1% sin 2 θ W

54 4 γ=12 γ=7,12 3 γ=7,8,9,10,11,12 χ % 12.3% 7.1% sin 2 θ W

55 1σ uncertainty in sin 2 θ W [%] Measurement duration for each γ [s] 2e+07 4e+07 6e+07 8e+07 1e+08 1 year one γ two γ s six γ s 2.7x10 12 ions/s 3 1e+12 3e+12 5e+12 7e+12 9e He intensity at the storage ring [ions/s]

56 28 1σ uncertainty in sin 2 θ W [%] LSND 01 one γ two γ s six γ s Systematic error at each γ [%]

57 Conclusions Low-energy beta-beams provide clean single type neutrino fluxes plus a range of E ν. They can be used to measure the Weinberg angle at Q 10 2 GeV to a better precision than LSND. A factor of three increase in the intensity of the ions (plus controlled systematics) can bring the 1σ uncertainty in the Weinberg angle down to 7% 10%.

58 Conclusions Low-energy beta-beams provide clean single type neutrino fluxes plus a range of E ν. They can be used to measure the Weinberg angle at Q 10 2 GeV to a better precision than LSND. A factor of three increase in the intensity of the ions (plus controlled systematics) can bring the 1σ uncertainty in the Weinberg angle down to 7% 10%.

59 Conclusions Low-energy beta-beams provide clean single type neutrino fluxes plus a range of E ν. They can be used to measure the Weinberg angle at Q 10 2 GeV to a better precision than LSND. A factor of three increase in the intensity of the ions (plus controlled systematics) can bring the 1σ uncertainty in the Weinberg angle down to 7% 10%.

60 ... THE END!

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