Sudakov Electroweak effects in transversely polarized beams

Abstract:We compute the leading-order evolution of parton distribution functions for all the Standard Model fermions and bosons up to energy scales far above the electroweak scale, where electroweak symmetry is restored. Our results include the 52 PDFs of the unpolarized proton, evolving according to the SU(3), SU(2), U(1), mixed SU(2)×U(1) and Yukawa interactions. We illustrate the numerical effects on parton distributions at large energies, and show that this can lead to important corrections to parton luminosities at a future 100 TeV collider.

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“…Summing over possible loops, one has 24) where j∈f,h is a sum over all fermions and Higgs bosons which are not antiparticles, and…”

Section: Jhep08(2017)036mentioning

confidence: 99%

Standard Model parton distributions at very high energies

Bauer

Ferland

Webber

2017

J. High Energ. Phys.

118

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“…Then, our structure functions are labeled by (T, Y, CP ). Furthermore, we have to consider the "mixed cases": left fermion-right fermion when we are in presence of transverse polarized initial beams [20], B − W 3 mixing when the asymptotic states are γ's or transverse Z [14] and h − φ 3 for longitudinal Goldstone modes [15]. While we refer to the cited works for details, here we stress the fact that we work in the (φ 1 , φ 2 , φ 3 , h) rather than the 1, 2,1,2 basis used in [15] The scalar evolution equations, using definitions (44-60) and eqs.…”

Section: B3mentioning

confidence: 99%

“…We write here an example in order to clarify this procedure; an analysis at the leading double log level has already been done [15,16,14,20]. We discuss the change of basis for the structure functions F , but things work in exactly the same way for the overlap matrix.…”

Section: B3mentioning

confidence: 99%

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Electroweak evolution equations

Ciafaloni¹,

Comelli²

2005

J. High Energy Phys.

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Enlarging a previous analysis, where only fermions and transverse gauge bosons were taken into account, we write down infrared-collinear evolution equations for the Standard Model of electroweak interactions computing the full set of splitting functions. Due to the presence of double logs which are characteristic of electroweak interactions (Bloch-Nordsieck violation), new infrared singular splitting functions have to be introduced. We also include corrections related to the third generation Yukawa couplings.

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“…Ref. [19]. It would be interesting to actually carry out a study to see how these effects could mimic effects arising from NP of this type.…”

Section: Discussionmentioning

confidence: 99%

Top-spin analysis of new scalar and tensor interactions ine+e−collisions with beam polarization

2011

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We utilize top polarization in the process e þ e À ! t " t at the International Linear Collider (ILC) with transverse beam polarization to probe interactions of the scalar and tensor type beyond the standard model and to disentangle their individual contributions. Ninety percent confidence level limits on the interactions with realistic integrated luminosity are presented and are found to improve by an order of magnitude compared to the case when the spin of the top quark is not measured. Sensitivities of the order of a few times 10 À3 TeV À2 for real and imaginary parts of both scalar and tensor couplings at ffiffi ffi s p ¼ 500 and 800 GeV with an integrated luminosity of 500 fb À1 and completely polarized beams are shown to be possible. A powerful model-independent framework for inclusive measurements is employed to describe the spin-momentum correlations, and their C, P, and T properties are presented in a technical appendix.

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Sudakov Electroweak effects in transversely polarized beams

Cited by 21 publications

References 51 publications

Standard Model parton distributions at very high energies

Standard Model parton distributions at very high energies

Electroweak evolution equations

Top-spin analysis of new scalar and tensor interactions ine+e−collisions with beam polarization

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