FYI

Begin forwarded message:

From: Ruben Jaarsma rjaarsma@nikhef.nl Subject: Re: [Theory-wide] Presentation Date: 24 Aug 2016 08:10:31 GMT+2 To: "theory-wide@nikhef.nl" theory-wide@nikhef.nl

Dear all,

Just a reminder for my master thesis presentation, this morning at 10:00 in H320.

Kind regards,

Ruben Jaarsma

Van: Ruben Jaarsma Verzonden: vrijdag 19 augustus 2016 11:37 Aan: theory-wide@nikhef.nl Onderwerp: [Theory-wide] Presentation

Dear all,

On Wednesday at 10:00 a.m. I will give a presentation about my master research project. You’re all invited to attend, details are given below.

Kind regards,

Ruben Jaarsma

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Date: August 24, 2016 Time: 10:00 a.m. Location: H320

Speaker: Ruben Jaarsma Title: New Strategy to Extract the CP-violating Phase phi_s from Bs -> K-K+ Abstract: The Bd -> pi-pi+, Bs -> K-K+ system allows the extraction of the angle gamma of the unitarity triangle and the Bs—Bs-bar mixing phase phi_s. The LHCb collaboration presented first results with a precision at the 7 degree level. Unless there is theoretical progress, it is challenging to reduce this uncertainty below O(5 deg) due to U-spin breaking corrections. A new strategy for the optimal determination of phi_s is proposed. New elements are the semileptonic decays Bd -> pi-l+nu and Bs -> K-l+nu. Moreover, the U-spin symmetry is only applied to theoretically favourable quantities. Corrections from U-spin breaking are determined. A theoretical precision of up to 0.5 degree is possible in the era of Belle II and the LHCb upgrade. As Bs->K-K+ is dominated by penguin topologies, comparison with the SM expectation and alternative determinations such as from Bs -> J/psi phi may reveal new sources of CP violation.

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