Long-distance effects in $B\rightarrow K^*\ell \ell $ from analyticity - INSPIRE

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Long-distance effects in $B\rightarrow K^*\ell \ell$ from analyticity

Christoph Bobeth
(
- Munich, Tech. U. and
- Munich, Tech. U., Universe
)
,
Marcin Chrzaszcz
(
- Cracow, INP and
- Zurich U.
)
,
Danny van Dyk
(
- Zurich U.
)
,
Javier Virto
(
- Munich, Tech. U. and
- MIT, Cambridge, CTP
)

Jul 23, 2017

10 pages

Published in:

Eur.Phys.J.C 78 (2018) 6, 451

Published: Jun 5, 2018

e-Print:

1707.07305 [hep-ph]

DOI:

10.1140/epjc/s10052-018-5918-6

Report number:

EOS-2017-01,
MIT-CTP-4918,
TUM-HEP-1087-17,
ZU-TH-17-17

View in:

ADS Abstract Service

reference search174 citations

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Abstract: (Springer)

We discuss a novel approach to systematically determine the dominant long-distance contribution to

B\rightarrow K^*\ell \ell

decays in the kinematic region where the dilepton invariant mass is below the open charm threshold. This approach provides the most consistent and reliable determination to date and can be used to compute Standard Model predictions for all observables of interest, including the kinematic region where the dilepton invariant mass lies between the

J/\psi

and the

\psi (2S)

resonances. We illustrate the power of our results by performing a New Physics fit to the Wilson coefficient

C_9

. This approach is systematically improvable from theoretical and experimental sides, and applies to other decay modes of the type

B\rightarrow V\ell \ell

,

B\rightarrow P\ell \ell

and

B\rightarrow V\gamma

.

Note:

10 pages, 5 figures

B: semileptonic decay
B: radiative decay
dilepton: production
dilepton: final state
dilepton: mass spectrum
decay: flavor changing
neutral current: flavor changing
scattering amplitude: analytic properties
B --> K*(892) lepton antilepton
B --> K*(892) photon

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