Asset Details
Do you wish to reserve the book?
B-decay discrepancies after Moriond 2019
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
B-decay discrepancies after Moriond 2019
Do you wish to request the book?
B-decay discrepancies after Moriond 2019
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Journal Article
B-decay discrepancies after Moriond 2019
2020
Overview
Following the updated measurement of the lepton flavour universality (LFU) ratio
R
K
in
B
→
K
ℓ
ℓ
decays by LHCb, as well as a number of further measurements, e.g.
R
K
∗
by Belle and
B
s
→
μ
μ
by ATLAS, we analyse the global status of new physics in
b
→
s
transitions in the weak effective theory at the
b
-quark scale, in the Standard Model effective theory above the electroweak scale, and in simplified models of new physics. We find that the data continues to strongly prefer a solution with new physics in semi-leptonic Wilson coefficients. A purely muonic contribution to the combination
C
9
=
-
C
10
, well suited to UV-complete interpretations, is now favoured with respect to a muonic contribution to
C
9
only. An even better fit is obtained by allowing an additional LFU shift in
C
9
. Such a shift can be renormalization-group induced from four-fermion operators above the electroweak scale, in particular from semi-tauonic operators, able to account for the potential discrepancies in
b
→
c
transitions. This scenario is naturally realized in the simplified
U
1
leptoquark model. We also analyse simplified models where a LFU effect in
b
→
s
ℓ
ℓ
is induced radiatively from four-quark operators and show that such a setup is on the brink of exclusion by LHC di-jet resonance searches.
Publisher
Springer Berlin Heidelberg,Springer,Springer Nature B.V,Springer Verlag (Germany),SpringerOpen
