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The role of W-pair production at future linear colliders.

The role of W-pair production at future linear colliders

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The role of W-pair production at future linear colliders

The W-pair production cross-section is an order more then one for fermion pair creation or any other reactions.This reaction is not only a big background but has to be used as main information channel replacing fermion pairs. The reaction is sensitive to new physics, connected with neutral gauge boson Z', and any modifications of gauge group structure. The analysis of decay product of W may even give us possibilities to make some kind of polarization measurement without polarized initial leptons.

V. V. Gilewsky [[email protected]]

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

The σ has to fall with energy

- Gauge principles demand Giγ=GiZ=Gi
- G3 ~ y -3/2
- G5 ~ y -1
To keep σ =const we have to have G1+G2 +1=0;

To have falling σ => G1=1, G2 =-2 (SM value)

For CP-non-invariant form-factors

- G4 ~ y -1
- G7 ~ y -1/2
- G6 ~ const
So, only SM value survive = fine tuning

V.Gilewsky - Role WW on FLC

- We know the increasing role of corrections
- Radiation corrections to angular distrib [T.Riemann at al.]

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

The case λ+=λ- gives un-polarized cross-section with overall coefficient (1-λ2).

For λ- =-1 and λ+=1 cross-section is defined by only s-channels.

Partial polarization gives all in the middle.

V.Gilewsky - Role WW on FLC

- The cross-section of WW production an order more then over ones
- Form-factors by unitary consideration have to be set on SM values
- Control over polarization allows to decries (cancel) the part of diagrams
- The Z’ produces the similar to ff-channel peak
- Even the case of un-polarized initial beams gives us possibility to analyze the polarization of final W by their decay product (vary complicated).

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

V.Gilewsky - Role WW on FLC

- V. Gilevsky, Universality of additional neutral currents, Physics Letters B, 1990, vol. 249, No. 2, p. 243 - 248.
- V.V.Gilewsky, I.S.Satsunkevich, General parameterization of the γγ W+W- interactions and its impact on physics at future colliders, ATL-PHYS-98-121 ; 9 March 1998, (10 p).
- V.V. Gilewsky, I. S. Satsunkevich, On multiboson interactions in 1/Λ2 order, Physics Letters B, 358 (1995) p. 95 - 100.
- V.V. Gilewsky, A.A. Pankov, I.S. Satsunkevich, Z' boson in e+e-→ W+W- , in book ``Physics of Elementary Interactions'', World Scientific 1991, p. 262 - 267.