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(4)

e ⁺ e ⁻ → νν ^_ ( γ ) N _ν = 4

N _ν = 2

e ⁺ e ⁻ → νν ^_ γ ( γ )

√ ^ s (GeV)

Cross Section (nb)

Thesis

Previous measurements SM prediction (KKMC)

LEP1-LEP2

a)

10 ^-2 10

-1

1 10

100 120 140 160 180 200

√ ^ s (GeV) σ meas / σ SM

Thesis

b)

0.8 1 1.2

190 195 200 205 210

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(9)

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(10)

Recoil Mass (GeV)

Events / 4 GeV

Data N _ν = 4 N _ν = 3 N _ν = 2

0 100 200 300 400

0 50 100 150 200

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(11)

N _ν

−∆ lnL

a)

0 0.5 1 1.5 2

2.8 3 3.2

f _W

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b)

0 0.5 1 1.5 2

0.8 0.9 1 1.1 1.2

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(12)

a) Mean = 2.999 Width = 0.079

N _ν (measured)

Samples/0.001

25 50 75 100 125

2.6 2.8 3 3.2 3.4

b) Mean = 0.078

δN _ν (measured)

Samples/0.0005

100 200 300

0.07 0.075 0.08 0.085 0.09

c)

N _ν (generated) N ν (measured)

2.7 2.8 2.9 3 3.1 3.2 3.3

d)

N _ν (generated) N ν (measured)-N ν (generated)

a = 1.01 ± 0.01 b = − 0.004 ± 0.002

-0.04 -0.02 0 0.02 0.04

2.7 2.8 2.9 3 3.1 3.2 3.3

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(13)

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Chapter Neutrino Production and Searches for New Physics

e + e − → νν _ ( γ ) N ν = 4

N ν = 2

e + e − → νν _ γ ( γ )

√  s (GeV)

Cross Section (nb)

Thesis

Previous measurements SM prediction (KKMC)

LEP1-LEP2

a)

10 -2 10

-1

1 10

100 120 140 160 180 200

√  s (GeV) σ meas / σ SM

Thesis

b)

0.8 1 1.2

190 195 200 205 210

Recoil Mass (GeV)

Events / 4 GeV

Data N ν = 4 N ν = 3 N ν = 2

0 100 200 300 400

0 50 100 150 200

N ν

−∆ lnL

a)

0 0.5 1 1.5 2

2.8 3 3.2

f W

−∆ lnL

b)

0 0.5 1 1.5 2

0.8 0.9 1 1.1 1.2

a) Mean = 2.999 Width = 0.079

N ν (measured)

Samples/0.001

25 50 75 100 125

2.6 2.8 3 3.2 3.4

b) Mean = 0.078

δN ν (measured)

Samples/0.0005

100 200 300

0.07 0.075 0.08 0.085 0.09

c)

N ν (generated) N ν (measured)

2.7 2.8 2.9 3 3.1 3.2 3.3

2.7 2.8 2.9 3 3.1 3.2 3.3

d)

N ν (generated) N ν (measured)-N ν (generated)

a = 1.01 ± 0.01 b = − 0.004 ± 0.002

-0.04 -0.02 0 0.02 0.04

2.7 2.8 2.9 3 3.1 3.2 3.3

e ⁺ e ⁻ → νν ^_ ( γ ) N _ν = 4

N _ν = 2

e ⁺ e ⁻ → νν ^_ γ ( γ )

√ ^ s (GeV)

10 ^-2 10

√ ^ s (GeV) σ meas / σ SM

Data N _ν = 4 N _ν = 3 N _ν = 2

N _ν

f _W

N _ν (measured)

δN _ν (measured)

N _ν (generated) N ν (measured)

N _ν (generated) N ν (measured)-N ν (generated)