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CP VIOLATION in b → s l + l - Transition. Direct CP-Violation . CP non-conservation shows up as a rate difference between two processes that are the CP conjugates of one-another. How can such a rate difference appear?.

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Slide1 l.jpg

CP VIOLATION in b → s l+ l- Transition

Direct cp violation l.jpg

Direct CP-Violation

CP non-conservation shows up as a rate difference between two processes that are the CP conjugates of one-another.

How can such a rate difference appear?

Slide3 l.jpg

This shows that the effect will vanish if the two coupling constants can be made

relatively real. And also if strong phase be zero.

Cp violation in sm l.jpg
CP violation in SM. constants can be made

4 parameters :

Euler angles: ½ n(n-1)=3

Complex Phase: ½ (n-1)(n-2)=1

Unitarity and Properties of CKM

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physics beyond the Standard Model constants can be made will have, in general, possible additional CP-violating parameters. Any further fields, such as any additional Higgs fields, can introduce further CP-violating couplings. Such effects may then enter into B decay physics.

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  • FCNC IN b s(d) TRANSITION : constants can be made

    1 . As a test of SM and beyond SM

    2. As a tool to Det. CKM elements

    such as Vtq(q=d,s,b), Vub

    3. CP- Violation

B s l l l.jpg

b → s l constants can be made+ l-

Vub Vus* + Vtb Vts* + Vcb Vcs* = 0

Using unitary condition of CKM matrix and

neglecting |VubV*us| in comparison to

|VtbV*ts| and |VcbV*cs| Indicate that such decay involves only

CP –Violation in this channel is suppressedby SM.

Beyond the sm l.jpg
Beyond the SM constants can be made

  • The possibility of CP violation the b → s transition has been studied in supersymmetry by [Kruger, et al].

  • The SM with fourth generation [Arhrib et al].

  • In another study, this has been studied with the addition of CP odd phases to Wilson coefficients [Aliev, et al].

The formalism l.jpg
The formalism constants can be made

  • Using general form of 4-Fermi interactions in SM.

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We extend the matrix element of the constants can be made

b → s l+ l- where C9get a new weak phase.

Minimal Extension of the SM:

ΛnewCan be parameterized as :

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Using the expression of the matrix element and neglecting the s-quark mass(ms), we obtain the expression for the differential decay rate as:

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Cp violation asymmetry l.jpg
CP-Violation asymmetry the

  • CP-Violation differential decay width asymmetry is defined:

The differential decay width for the cp conjugated process can be obtain by making the replacements l.jpg

The differential decay width for the the CP conjugated process can be obtain by making the replacements:

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CP the -asymmetry is evaluated to be

Since for any allowed region of s,  << , So, we can ignore the term proportional to in the dominator of equation:

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Numerical analysis the

  • we examine the dependence of ACP on new ..

  • ACP depends on both magnitude and phase of new .

  • The first measurement of the b → s l+ l- decay reported by BELLE

    help us to get an idea about magnitude of new. We assume that:

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In order to eliminate the the sdependence, instead of CP asymmetry in the differential decay width, we study CP asymmetry in the total decay width by doing numerical integration over

sin ACP(s) equation:

Slide18 l.jpg

The figure depicts that the ACP is sensitive to the new weak phase and can reach about 4.5% which is quite measurable at future colliders such as LHCb, BTeV, ATLAS CMS or ILC .

Slide19 l.jpg

In conclusion, this study has presented the CP asymmetry in the b → s l+ l- transition in

the minimal extension of the standard model where C9effreceived extra weak phase new due

to the new physics effects. We imposed 10% of uncertainty to the SM branching ratio of the

b → s l+ l- transition and obtained the bound on a new parameter new . Our predictive model

showed that the CP-violation asymmetry could reach to the order of 4.5% which was not only

entirely measurable in experiments, but also indicated the new physics effects, since in the

SM, this CP asymmetry is near zero.