[PPT] - Highlights and perspectives from the LHCb experiment Mat Charles PowerPoint Presentation

SLIDE 1

Highlights and perspectives from the LHCb experiment

Mat Charles (Sorbonne Université/LPNHE) representing the LHCb collaboration

1

v3

SLIDE 2

Thank you to the organisers

I know it's not the same as an in-person conference in

Paris*, but this is an important event for our community.

Really, a big thank-you to the organisers. This can't have

been easy to prepare.

... and good luck for LHCP 2021, which I look forward

to attending in person.

2

* e.g. less traffic

SLIDE 3

Highlights and perspectives

It's been a rough few months, but I'm pleased to say that

LHCb has some nice new results to report.

These include some that are brand new for this conference.

No spoilers here: you'll have to go to the talks to find out more.

First, a few words on our status and the ongoing upgrade.

3

SLIDE 4

Reminder: LHC schedule (as of 2019)

Clearly, details will change (especially for 2021).
See this morning's talk by Jose.
See also talk by F. Bordry on 5 May (Indico, slides)
But looking at the big picture...

4

From: https://lhc-commissioning.web.cern.ch/schedule/lhc-long-term.htm

SLIDE 5

LHCb plan

5

From: https://lhc-commissioning.web.cern.ch/schedule/lhc-long-term.htm

Run 3 LHCb upgrade I Run 4 LHCb upgrade Ib Run 5 and beyond LHCb upgrade II

In Run1+2, we accumulated about 9/fb of data. Most LHCb physics scales with

r

, which is roughly linear in the CM energy. In units of "one Run1", the data sample is about: 1 Run1 for Run1 4 Run1 for Run2 => total: 5 Run1 units so far.

σ(b¯ b) σ(c¯ c)

SLIDE 6

LHCb plan

6

From: https://lhc-commissioning.web.cern.ch/schedule/lhc-long-term.htm

Run 3 LHCb upgrade I Run 4 LHCb upgrade Ib Run 5 and beyond LHCb upgrade II

During LS2, we've been doing a major upgrade to the LHCb detector.

All subdetectors updated, and:
Many subdetectors overhauled or replaced.
Completely new trigger strategy: all-software.
Big jump in instantaneous lumi and in trigger

efficiency => much higher signal rates

Increase in output bandwidth, but smarter

computing model to swallow it. Few words on current status shortly.

CERN-LHCC-2012-007

Mark Tobin, Mon 18:00, plenary Vava Gligorov, Tue 15:03, Tools Dorothea vom Bruch, Wed 15:21, Performance

SLIDE 7

LHCb plan

7

From: https://lhc-commissioning.web.cern.ch/schedule/lhc-long-term.htm

Run 3 LHCb upgrade I Run 4 LHCb upgrade Ib Run 5 and beyond LHCb upgrade II

With the new trigger and higher lumi, we expect to take data at a higher rate with a higher efficiency with better alignment and calibration (real-time analysis) Original assumption: 5/fb per year after upgrade, total of 50/fb.  With a crude factor of 2 for removing the hardware trigger, this means: Run3: about 15-20/fb => about 20-25 Run1 units (total 25-30) Run4: about 20-25/fb => about 30-35 Run1 units (total ~ 60)

Mark Tobin, Mon 18:00, plenary

SLIDE 8

LHCb plan

8

From: https://lhc-commissioning.web.cern.ch/schedule/lhc-long-term.htm

Run 3 LHCb upgrade I Run 4 LHCb upgrade Ib Run 5 and beyond LHCb upgrade II

Run2 multiplied previous (Run1) stats by about 5. Run3 will multiply prev. (Run1-2) stats by about 5. Run4 will double previous (Run1-3) stats. Keep lumi doubling time short => plan for a second upgrade in LS4, perhaps with some parts pre-installed to take advantage of longer LS3.  Currently preparing a framework TDR. Goal: 300/fb by Run 6 (i.e. 5x Run1-4 stats)

CERN-LHCC-2018-027

Mark Tobin, Mon 18:00, plenary Nicola Neri, Tue 15:21, Upgrades

SLIDE 9

Ongoing upgrade work

COVID19* situation has caused, and is still causing, delays.
Assembly work at CERN halted during shutdown.
But also delays to work at other labs worldwide, and to transport of

components, and to movement of experts to/from CERN.

Work is now resuming, starting with pilot projects.

Scope will increase as CERN re-opens.

We do not yet know what the overall impact will be.
For more on the LHCb upgrades, see talk by Mark Tobin

this afternoon.

Next slides: a few illustrations of restarted work.
First, new news: decision made that the initial online

reconstruction will be done with a farm of GPU systems (ALLEN project). Some key work done right here in Paris!

9 * L'académie française aurait préféré « la covim ».

Mark Tobin, Mon 18:00, plenary

SLIDE 10

Ongoing upgrade work

10

Freek, Raphael, vacuum group and transport started to install the Velo RF boxes.

Photos courtesy of Rolf Linder

Mark Tobin, Mon 18:00, plenary

SLIDE 11

Ongoing upgrade work

11

Photos courtesy of Rolf Linder

Silvia, Christoph working

n the RICH 2 columns

together with Didier, Antonino and Giovanni Laurent, Danil and Tengiz repairing Maraton power supplies Michael and Jerome cleaning the UT Lukasz plant Oleg installing muon electronics boards Francesco, Karol, Loic, Tommaso, Rainer, Valerien,

Mark Tobin, Mon 18:00, plenary

SLIDE 12

LHCb at LHCP

Vava Gligorov: Triggering and online calibration with machine learning techniques*
Charlotte Barbara

Van Hulse: Soft QCD and Exclusive processes with LHCb

Sook Hyun Lee: Charged hadron production in Z-tagged jets (fragmentation of light quarks)
Jana Crkovská: Multiplicity dependent production of X(3872)
Dorothea

Vom Bruch: Performance of the real-time reconstruction, alignment, and calibration in Run 3 at LHCb

Alex Seuthe: PID performance in Run2 at LHCb
Renata Kopecna: Tracking and vertexing performance and developments over Run2 at LHCb
Benjamin Audurier: Recent results on heavy flavor in small and large systems from LHCb (Wed, Heavy ions)
Mirco Dorigo: CKM metrology and B decays
Guillaume Pietrzyk: CP-violation in charm
Jinlin Fu: CP violation in B decays
Miriam Lucio Martinez: Lepton flavour violation and universality tests at LHCb
Jacco de

Vries: Electroweak penguin decays

Marcin Kucharczyk: Search for long-lived particles in LHCb
Constantin Weisser: Search for dark photon in LHCb (Fri, Dark sectors & BSM)
Menglin Xu: EWK physics: Measurements and prospects from LHCb
Nicola Neri: Physics perspectives for LHCb beyond Run4
Christopher Betancourt: Timing at LHCb post LS4
Liupan An: CINCO: Study of exotic states* (Fri, joint QCD+Flavour)
Mark Tobin: LHCb upgrades
Mark Whitehead: CPV in B-Hadron decays*
Maurizio Martinelli: Charm physics*
William Barter: Precision QCD measurements*

12

A probably incomplete list of talks by LHCb speakers:

Red indicates upcoming result that I will not talk about * = CINCO talk

SLIDE 13

New since LHCP 2019...

13

Will just pick out some recent highlights.

LHCb-PAPER-2019-023: Observation of the Λ0

b → c1(3872)pK decay

LHCb-PAPER-2019-024: Measurement of the ⌘c(1S) production cross-section in pp collisions at √s = 13 TeV LHCb-PAPER-2019-025: Observation of new resonances in the Λ0

b⇡+⇡ system

LHCb-PAPER-2019-027: Determination of quantum numbers for several excited charmed mesons observed in B → D⇤+⇡⇡ decays LHCb-PAPER-2019-028: Search for CP violation and observation of P violation in Λ0

b → p⇡⇡+⇡ decays

LHCb-PAPER-2019-029: Search for the doubly charmed baryon Ξ+

cc

LHCb-PAPER-2019-030: Measurement of the shape of the B0

s → D⇤ sµ⌫µ differential distribution

LHCb-PAPER-2019-031: Search for A0 → µ+µ decays LHCb-PAPER-2019-032: Updated measurement of decay-time-dependent CP asymmetries in D0 → K+K and D0 → ⇡+⇡ decays LHCb-PAPER-2019-033: Measurement of the B

c production fraction and asymmetry in 7 and 13 TeV pp collisions

LHCb-PAPER-2019-034: Observation of the semileptonic decay B+ → p¯ pµ+⌫µ LHCb-PAPER-2019-035: Measurement of Ξ++

cc

production in pp collisions at √s = 13 TeV LHCb-PAPER-2019-036: Measurement of CP violation in B0 → D⇤±D⌥ decays LHCb-PAPER-2019-037: Precision measurement of the Ξ++

cc

mass LHCb-PAPER-2019-038: Strong constraints on the K0

S → µ+µ branching fraction

LHCb-PAPER-2019-039: Isospin amplitudes in Λ0

b → J/ Λ(Σ0) and Ξ0 b → J/ Ξ0(Λ) decays

LHCb-PAPER-2019-040: Test of lepton universality with Λ0

b → pK`+` decays

LHCb-PAPER-2019-041: Measurement of |Vcb| with B0

s → D(⇤) s

µ+⌫µ decays LHCb-PAPER-2019-042: First observation of excited Ω

b states

LHCb-PAPER-2019-043: Search for the lepton flavour violating decay B+ → K+µ⌧ + using B⇤0

s2 decays

LHCb-PAPER-2019-044: Measurement of CP observables in B± → DK± and B± → D⇡± with D → K0

SK⇡ decays

LHCb-PAPER-2019-045: Observation of a new baryon state in the Λ0

b⇡+⇡ mass spectrum

LHCb-PAPER-2019-046: Measurement of the shape of the B0

s → D⇤ s µ+⌫µ differential decay rate

LHCb-PAPER-2020-001: Search for the rare decays B0

s → e+e and B0 → e+e

LHCb-PAPER-2020-002: Measurement of CP-averaged observables in the B0 → K⇤0µ+µ decay LHCb-PAPER-2020-003: Precise measurement of the B+

c meson mass

LHCb-PAPER-2020-004: Observation of new Ξ0

c baryons decaying to Λ+ c K

LHCb-PAPER-2020-005: Measurement of the Λ0

b → J/ Λ angular distribution and the Λ0 b polarisation in pp collisions

LHCb-CONF-2019-003: Measurement of the Z production cross-sections in pPb collisions at √=8 TeV LHCb-CONF-2019-004: Study of prompt D0 meson production in pPb at √sNN = 8.16 TeV at LHCb LHCb-CONF-2019-005: Multiplicity-dependent modification of c1(3872) and (2S) production in pp collisions at √s = 8 TeV

<latexit sha1_base64="TQ46vAF2YVAjwnTGEsnOsHNo7c=">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</latexit><latexit sha1_base64="TQ46vAF2YVAjwnTGEsnOsHNo7c=">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</latexit><latexit sha1_base64="TQ46vAF2YVAjwnTGEsnOsHNo7c=">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</latexit><latexit sha1_base64="TQ46vAF2YVAjwnTGEsnOsHNo7c=">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</latexit>

SLIDE 14

14

Rare & electroweak penguin decays

arXiv:2003.04831: Measurement of

averaged observables in the

decay arXiv:2003.03999: Search for the rare decays and arXiv:2001.10354: Strong constraints on the branching fraction JHEP 2020, 40 (2020): Test of lepton universality with decays

CP B0 → K*0μ+μ− B0

s → e+e−

B0 → e+e− K0

S → μ+μ−

Λ0

b → pK−ℓ+ℓ−

SLIDE 15

Why rare decays?

Look at processes where NP could plausibly enter.
If suppressed in the SM: NP could enter at a rate that's

comparable.

If NP smaller but not vastly smaller, can show up in interference effects
If forbidden in the SM: immediate smoking gun
Focus particularly on processes that are theoretically and

experimentally clean.

no good if uncertainty on SM prediction > experimental precision

15

SLIDE 16

B0

(s) → e+e−

Classic rare decays for which the SM predicted BF is very small

=> any signal would be a sign of NP .

Conceptually similar to, but more suppressed than,
Let's start with

...

B0

s → μ+μ−

B0

(s) → e+e−

16 arXiv:2003.03999: Search for the rare decays and arXiv:2001.10354: Strong constraints on the branching fraction

B0

s → e+e−

B0 → e+e− K0

S → μ+μ−

Fleischer et al, JHEP 05 (2017) 156

10-16 10-13 10-10 10-7 10-4 10-1

NP could hide here! {

<latexit sha1_base64="hszuCLg3wDxm6JfqLTSWvwf+/84=">ACFXicdVDLSgMxFM3UV62vqks3wSK4GmbG0tZd0Y3LKvYB7VAyaYNzSRDkhHL0D9wq36NO3Hr2p8RM20FK3rgwuGce7n3niBmVGnH+bByK6tr6xv5zcLW9s7uXnH/oKVEIjFpYsGE7ARIEUY5aWqGenEkqAoYKQdjC8zv31HpKC3+pJTPwIDTkNKUbaSDe9tF8sOfZ5reKVK9CxHafqem5GvGr5rAxdo2QogQUa/eJnbyBwEhGuMUNKdV0n1n6KpKaYkWmhlygSIzxGQ9I1lKOIKD+dXTqFJ0YZwFBIU1zDmfpzIkWRUpMoMJ0R0iP128vEv7xuosOan1IeJ5pwPF8UJgxqAbO34YBKgjWbGIKwpOZWiEdIqxNOEtbpNAmGz5c+iQdShSPKL6fFkxg36nA/0nLs13Hdq+9Uv1iEV0eHIFjcApcUAV1cAUaoAkwCMEDeARP1rP1Yr1ab/PWnLWYOQRLsN6/AsNoFk=</latexit><latexit sha1_base64="hszuCLg3wDxm6JfqLTSWvwf+/84=">ACFXicdVDLSgMxFM3UV62vqks3wSK4GmbG0tZd0Y3LKvYB7VAyaYNzSRDkhHL0D9wq36NO3Hr2p8RM20FK3rgwuGce7n3niBmVGnH+bByK6tr6xv5zcLW9s7uXnH/oKVEIjFpYsGE7ARIEUY5aWqGenEkqAoYKQdjC8zv31HpKC3+pJTPwIDTkNKUbaSDe9tF8sOfZ5reKVK9CxHafqem5GvGr5rAxdo2QogQUa/eJnbyBwEhGuMUNKdV0n1n6KpKaYkWmhlygSIzxGQ9I1lKOIKD+dXTqFJ0YZwFBIU1zDmfpzIkWRUpMoMJ0R0iP128vEv7xuosOan1IeJ5pwPF8UJgxqAbO34YBKgjWbGIKwpOZWiEdIqxNOEtbpNAmGz5c+iQdShSPKL6fFkxg36nA/0nLs13Hdq+9Uv1iEV0eHIFjcApcUAV1cAUaoAkwCMEDeARP1rP1Yr1ab/PWnLWYOQRLsN6/AsNoFk=</latexit><latexit sha1_base64="hszuCLg3wDxm6JfqLTSWvwf+/84=">ACFXicdVDLSgMxFM3UV62vqks3wSK4GmbG0tZd0Y3LKvYB7VAyaYNzSRDkhHL0D9wq36NO3Hr2p8RM20FK3rgwuGce7n3niBmVGnH+bByK6tr6xv5zcLW9s7uXnH/oKVEIjFpYsGE7ARIEUY5aWqGenEkqAoYKQdjC8zv31HpKC3+pJTPwIDTkNKUbaSDe9tF8sOfZ5reKVK9CxHafqem5GvGr5rAxdo2QogQUa/eJnbyBwEhGuMUNKdV0n1n6KpKaYkWmhlygSIzxGQ9I1lKOIKD+dXTqFJ0YZwFBIU1zDmfpzIkWRUpMoMJ0R0iP128vEv7xuosOan1IeJ5pwPF8UJgxqAbO34YBKgjWbGIKwpOZWiEdIqxNOEtbpNAmGz5c+iQdShSPKL6fFkxg36nA/0nLs13Hdq+9Uv1iEV0eHIFjcApcUAV1cAUaoAkwCMEDeARP1rP1Yr1ab/PWnLWYOQRLsN6/AsNoFk=</latexit><latexit sha1_base64="hszuCLg3wDxm6JfqLTSWvwf+/84=">ACFXicdVDLSgMxFM3UV62vqks3wSK4GmbG0tZd0Y3LKvYB7VAyaYNzSRDkhHL0D9wq36NO3Hr2p8RM20FK3rgwuGce7n3niBmVGnH+bByK6tr6xv5zcLW9s7uXnH/oKVEIjFpYsGE7ARIEUY5aWqGenEkqAoYKQdjC8zv31HpKC3+pJTPwIDTkNKUbaSDe9tF8sOfZ5reKVK9CxHafqem5GvGr5rAxdo2QogQUa/eJnbyBwEhGuMUNKdV0n1n6KpKaYkWmhlygSIzxGQ9I1lKOIKD+dXTqFJ0YZwFBIU1zDmfpzIkWRUpMoMJ0R0iP128vEv7xuosOan1IeJ5pwPF8UJgxqAbO34YBKgjWbGIKwpOZWiEdIqxNOEtbpNAmGz5c+iQdShSPKL6fFkxg36nA/0nLs13Hdq+9Uv1iEV0eHIFjcApcUAV1cAUaoAkwCMEDeARP1rP1Yr1ab/PWnLWYOQRLsN6/AsNoFk=</latexit>

Giacomo Fedi, Fri 18:00, plenary Jacco De Vries, Tue 15:03, Flavour Miriam Lucio Martinez, Tue 15:21, Flavour

SLIDE 17

B0

(s) → e+e−

Apply reconstruction (incl. brem. recovery), selection
Simultaneous fit by dataset, bremsstrahlung category
No signal => set upper limit (CLs) at 95% CL:

17 arXiv:2003.03999: Search for the rare decays and

B0

s → e+e−

B0 → e+e−

4500 5000 5500 6000 6500

]

2

c ) [MeV/

−

e

+

e ( m

200 400

)

2

c Candidates / ( 120 MeV/

LHCb

2016 data − 2015

−

e

+

e →

s

B full model combinatorial decays

e

ν

+

e D →

+

B decays

−

e

+

e X → B decays

e

ν

−

e

+

h →

b

X decays

−

h'

+

h → B

The places where you don't see a signal

ℬ(B0

s → e+e−) < 11.2 × 10−9

Fleischer et al, JHEP 05 (2017) 156

30x improvement!

10-16 10-13 10-10 10-7 10-4 10-1

Similar story for B0: ℬ(B0 → e+e−) < 2.5 (3.0) × 10−9

Giacomo Fedi, Fri 18:00, plenary Jacco De Vries, Tue 15:03, Flavour Miriam Lucio Martinez, Tue 15:21, Flavour

SLIDE 18

1 2 3 4 B(K0

S → µ+µ−) [×10−10]

2 4 6 8 10 −2∆logL LHCb

90% 95%

Run 1 only Run 2 only Combination

K0

S → μ+μ−

is even cleaner, and we make a lot of KS
Veto background from material interactions in

VELO

Simultaneous fit across bins of BDT, trigger category:

K0

S → μ+μ−

18 arXiv:2001.10354: Strong constraints on the branching fraction

K0

S → μ+μ−

480 500 520 540 560 580 M(µ+µ−) [MeV/c2] 10−2 10−1 100 101 102 Candidates/(1.0 MeV/c2) LHCb

K0

S → µ+µ−

K0

L → µ+µ−

K0

S → π+π−

Combinatorial Total

One example category in simultaneous fit The place where you don't see a signal

at 90% CL (world-best)

ℬ(K0

S → μ+μ−) < 2.1 × 10−10

Room for NP: 102 from SM prediction: (5.18 ± 1.50 ± 0.02) × 10−12

D'Ambrosio & Kitahara, PRL 119, 201802 (2017)

Giacomo Fedi, Fri 18:00, plenary Jacco De Vries, Tue 15:03, Flavour Miriam Lucio Martinez, Tue 15:21, Flavour

SLIDE 19

The anomalies

Various curious effects seen in electroweak penguin decays
and in semileptonic decays; not discussed here
First showed up in angular and

distributions of decays -- but these have significant theory uncertainties.

Solution 1: look at ratios of lepton flavours, e.g.
Solution 2: develop optimised observables to reduce theory errors
No single result is significant -- but we keep seeing small effects,

mostly 2-3𝜏.

And these days, even 2-3𝜏 effects represent hope
Will cover one recent result from each class.
Work ongoing to update other measurements.

q2 b → sμ+μ−

B → Kμ+μ−/B → Ke+e−

19 arXiv:2003.04831: Measurement of

averaged observables in the

decay JHEP 2020, 40 (2020): Test of lepton universality with decays

CP B0 → K*0μ+μ− Λ0

b → pK−ℓ+ℓ−

SLIDE 20

RpK ( )

Λ0

b → pK−ℓ+ℓ−

Measure double ratio to suppress detector effects:

R−1

pK =

ℬ(Λ0

b → pK−e+e−)

ℬ(Λ0

b → pK−J/ψ( → e+e−)) /

ℬ(Λ0

b → pK−μ+μ−)

ℬ(Λ0

b → pK−J/ψ( → μ+μ−))

20 JHEP 2020, 40 (2020): Test of lepton universality with decays

Λ0

b → pK−ℓ+ℓ−

]

2

c ) [GeV/

−

µ

+

µ

−

pK (

ψ / J

m 5.4 5.5 5.6 5.7 5.8

2

c Candidates per 5 MeV/ 2 4 6 8 10 12

3

10 ×

ψ / J − pK → b Λ Combinatorial ψ / J − K + K → s B ψ / J *0 K → B

swap

pK

LHCb ]

2

c ) [GeV/

−

e

+

e

−

pK (

ψ / J

m 5.4 5.6 5.8 6 6.2

2

c Candidates per 9 MeV/ 0.5 1 1.5 2

3

10 ×

ψ / J − pK → b Λ Combinatorial ψ / J − K + K → s B ψ / J *0 K → B

swap

pK

LHCb ]

2

c ) [GeV/

−

µ

+

µ

−

pK ( m 5.4 5.6 5.8

2

c Candidates per 13 MeV/ 20 40 60 80 100 120 140

− µ + µ − pK → b Λ Combinatorial − µ + µ − K + K → s B − µ + µ *0 K → B

LHCb ]

2

c ) [GeV/

−

e

+

e

−

pK ( m 5 5.5 6

2

c Candidates per 50 MeV/ 5 10 15 20 25 30 35 40 45

− e + e − pK → b Λ Combinatorial − e + e π − pK → b Λ ψ / J − pK → b Λ − e + e − K + K → s B − e + e *0 K → B

LHCb

Electrons Muons

6.0<q2<11.0 GeV2 8.41<q2<10.24 GeV2

J/ψ

Rare mode (0.1<q2<6.0 GeV2)

First obs!  > 7𝜏

r−1

J/ψ = 0.96 ± 0.05

R−1

pK = 1.17+0.18 −0.16 ± 0.07

(RpK = 0.86+0.14

−0.11 ± 0.05 < 1)

Double ratio cancels many systematic effects. Powerful crosscheck: measure efficiency-corrected ratio

f

yields, which doesn't benefit from this cancellation.

R−1

pK

J/ψ

Giacomo Fedi, Fri 18:00, plenary Jacco De Vries, Tue 15:03, Flavour Miriam Lucio Martinez, Tue 15:21, Flavour

SLIDE 21

angular analysis

B0 → K*0μ+μ−

Look at angular observables vs q2
Use "optimised" variables to help cancel hadronic effects, e.g. P'5
To pull the information together, use Wilson coefficients:
Main interest in EW penguin operators: C9, C'9, C10, C'10
New this March: Run1+2016 update with B0 → K*0μ+μ−

21

Thanks to C. Langenbruch

Heff = −4GF √ 2 VtbV ∗

ts

e2 16⇡2 X

i

Ci Oi

Wilson coefficient (“effective coupling”) Local operator

∆HNP =  Λ2

NP

Oi

Flavour-violating coupling NP scale

Optimised variables: Descotes-Genon et al, JHEP , 1301:048, 2013, JHEP , 1305:137, 2013

arXiv:2003.04831: Measurement of

averaged observables in the

decay

CP B0 → K*0μ+μ−

Giacomo Fedi, Fri 18:00, plenary Jacco De Vries, Tue 15:03, Flavour Miriam Lucio Martinez, Tue 15:21, Flavour

SLIDE 22

angular analysis

B0 → K*0μ+μ−

Fit to angular distribution in bins of
Work with two different parameterisations
Correct for efficiency
Model background, incl. S-wave under the
Fit results to full set of angular observables

in paper. Illustrating with just one:

q2

K*0

22 arXiv:2003.04831: Measurement of

averaged observables in the

decay

CP B0 → K*0μ+μ−

5200 5400 5600

]

2

c ) [MeV/

−

µ

+

µ

−

π

+

K ( m

100 200 300

2

c Candidates / 5.3 MeV/

LHCb 2016

5200 5400 5600

]

2

c ) [MeV/

−

µ

+

µ

−

π

+

K ( m

100 200 300

2

c Candidates / 5.3 MeV/

LHCb Run 1

2398 ± 57 2187 ± 53

5 10 15

]

4

c /

2

[GeV

2

q

1 − 0.5 − 0.5 1

5

' P

(1S) ψ / J (2S) ψ

LHCb Run 1 + 2016

SM from DHMV

... but one observable alone is not the full story. What is the overall picture?

Giacomo Fedi, Fri 18:00, plenary Jacco De Vries, Tue 15:03, Flavour Miriam Lucio Martinez, Tue 15:21, Flavour

SLIDE 23

−2.0 −1.5 −1.0 −0.5 0.0 0.5 1.0 1.5 2.0

∆Re(C9)

−2.0 −1.5 −1.0 −0.5 0.0 0.5 1.0 1.5 2.0

∆Re(C10)

flavio v2.0.0

LHCb

Run 1 2016 Run 1 + 2016

−2.0 −1.5 −1.0 −0.5 0.0 0.5 1.0 1.5 2.0

∆Re(C9)

5 10 15 20 25 30 35

−2∆logL

flavio v2.0.0

LHCb

Run 1 2016 Run 1 + 2016

angular analysis

B0 → K*0μ+μ−

"What is the overall picture?"

Caution:

Depends on your "SM" model and its theory uncertainties
Depends on what variations you consider (what degrees of freedom).

23

Varying and

Re(C9) Re(C10)

Disclaimer: 2016-only contours are for illustration purposes and contains no systematic uncertainties or bias and coverage corrections

SM Varying only :

(or if excluding )

Re(C9) 3.3σ

2.7σ 6 < q2 < 8 GeV/c2

Disclaimer: 2016-only contours are for illustration purposes and contains no systematic uncertainties or bias and coverage corrections

arXiv:2003.04831: Measurement of

averaged observables in the

decay

CP B0 → K*0μ+μ−

Giacomo Fedi, Fri 18:00, plenary Jacco De Vries, Tue 15:03, Flavour Miriam Lucio Martinez, Tue 15:21, Flavour

SLIDE 24

24

CKM & CPV

SLIDE 25

in

|Vcb| B0

s → D(*)− s

μ+νμ

Key idea: differential decay rate goes like:

25

Decay amplitude can be expressed as sum of helicity amplitudes
... which can be expressed in terms of form factors that depend on

(or w)

... whose evolution can be parameterised (CLN, BGL).
So: assume FF parameterisation, fit yield as function of
r w, deduce
in practice, measure relative to control modes
Problem:

and w can't be measured  directly.

Solution: measure instead

: fully  reconstructed and correlated with w

H+,−,0,t q2 q2 |Vcb| B0 → D(*)−μ+νμ q2 = m2(μ+νμ) p⊥(D(s))

d4Γ(B → D∗µν) dw dcos θµ dcos θD dχ = 3m3

Bm2 D∗G2 F

16(4π)4 η2

EW|Vcb|2|A(w, θµ, θD, χ)|2,

Ds(*) μ ν Bs PV SV Ds(*)+μ

p⊥(Ds)

PRD 101, 072004 (2020): Measurement of with decays

|Vcb| B0

s → D(*)− s

μ+νμ

Mark Whitehead, Fri 17:30, plenary Mirco Dorigo, Thu 15:25, Flavour

SLIDE 26

in

|Vcb| B0

s → D(*)− s

μ+νμ

26 PRD 101, 072004 (2020): Measurement of with decays

|Vcb| B0

s → D(*)− s

μ+νμ

4 4.5 5 5.5

]

2

c [GeV/

corr

m

5 10 15 20 25 30 35

3

10 ×

2

c Candidates per 0.1 GeV/

µ

ν

+

µ

s −

D →

s

B

µ

ν

+

µ

s − *

D →

s

B

Phys. bkg.
Comb. bkg.

LHCb

0.5 1 1.5 2 2.5

] c ) [GeV/

s −

D ( p

2 4 6 8 10 12 14 16 18 20 22

3

10 ×

c Candidates per 0.115 GeV/

LHCb

Multidimensional fit to and corrected mass mcorr

p⊥(D(s))

10 20 30 40

]

3 −

| [10

cb

V |

ALEPH [PLB 395, 373 (1997)] CLEO [PRL 82, 3746 (1999)] Belle [PRD 93, 032006 (2016)] BaBar [PRD 79, 012002 (2009)] BaBar [PRL 104, 011802 (2010)] ALEPH [PLB 395, 373 (1997)] CLEO [PRL 89, 081803 (2002)] OPAL [PLB 482, 15 (2000)] OPAL [PLB 482, 15 (2000)] DELPHI [PLB 510, 55 (2001)] DELPHI [EPJ C33, 213 (2004)] BaBar [PRD 77, 032002 (2008)] BaBar [PRL 100, 231803 (2008)] BaBar [PRD 79, 012002 (2009)] Belle [PRD 100, 052007 (2019)] BaBar [PRL 123, 091801 (2019)] LHCb [LHCb-PAPER-2019-041] CLN BGL CLN BGL CLN BGL CLN BGL Exclusive average (HFLAV 2019) Inclusive average (HFLAV 2019)

CLN:   BGL:

First measurement of

with decays

Novel method (use of

) can be applied more broadly, esp. to measure in decays.

|Vcb| = (41.4 ± 0.6 ± 0.9 ± 1.2) × 10−3 |Vcb| = (42.3 ± 0.8 ± 0.9 ± 1.2) × 10−3 |Vcb| B0

s

p⊥ |Vcb| B0,+

Mark Whitehead, Fri 17:30, plenary Mirco Dorigo, Thu 15:25, Flavour

SLIDE 27

27

Spectroscopy

arXiv:2002.05112: Observation of a new baryon state in the mass spectrum PRL 124, 082002 (2020): First observation of excited states arXiv:2003.13649 : Observation of new baryons decaying to

Λ0

b π+π−

Ω−

b

Ξ0

c

Λ+

c K−

SLIDE 28

Excited Ω−

b → Ξ0 bK−

Reconstruct
Study

mass spectrum, identify several peaks

Common fit to WS, RS samples

to constrain background shape

Accounting for LEE, two peaks

have significance above

All peaks narrow (

  at 90% CL)

Ξ0

b → Ξ+ c π−, Ξ+ c → pK−π+

m(Ξ0

bK−) − m(Ξ0 b)

5σ Γ < 3.1 MeV

28

) [MeV]

b

Ξ ( M ) -

+

K

b

Ξ ( M

500 550 600

Number of candidates / 1 MeV

10 20 30

LHCb

Data Full fit Background

) [MeV]

b

Ξ ( M ) -

−

K

b

Ξ ( M

500 550 600

Number of candidates / 1 MeV

10 20 30

LHCb

Data Full fit Signals Background

6.7σ 6.2σ 2.6σ 2.1σ

Peak of δM Width Signal Significances [σ] [MeV] [MeV] yield Local Global 523.74 ± 0.31 0.00 + 0.7

− 0.0

15 +6

− 5

3.6 2.1 538.40 ± 0.28 0.00 + 0.4

− 0.0

18 + 6

− 5

3.7 2.6 547.81 ± 0.26 0.47 + 0.6

− 0.5

47 + 11

− 10

7.2 6.7 557.98 ± 0.35 1.4 + 1.0

− 0.8

57 + 14

− 13

7.0 6.2

PRL 124, 082002 (2020): First observation of excited states

Ω−

b

Will Barter, Tue 17:30, plenary

SLIDE 29

Excited Ω−

b → Ξ0 bK−

Note qualitative similarity:

spectrum in and  spectrum in .

Properties consistent with low-

lying L=1 resonances (but TBC)

Ω−

b

m(Ξ0

bK−)

Ω0

c

m(Ξ+

c K−)

29

) [MeV]

−

K

+ c

Ξ ( m 3000 3100 3200 3300 Candidates / (1 MeV) 100 200 300 400 LHCb

) [MeV]

b

Ξ ( M ) -

−

K

b

Ξ ( M

500 550 600

Number of candidates / 1 MeV

10 20 30

LHCb

Data Full fit Signals Background

PRL 118, 182001 (2017) PRL 124, 082002 (2020): First observation of excited states

Ω−

b

Will Barter, Tue 17:30, plenary

SLIDE 30

Excited Ξ0

c → Λ+ c K−

Three states observed with high significance
First two (2923, 2939) could be resolved peaks of

structure previously reported by BABAR (PRD 77:031101, 2008), Belle (EPJC 78, 252 (2018))... but needs further study.

Third (2965) likely related to

previously reported by BABAR & Belle, but mass & width in tension; needs further study.

Ξc(2930)0 Ξc(2970)

30 arXiv:2003.13649 : Observation of new baryons decaying to

Ξ0

c

Λ+

c K−

100 200 300

) [MeV]

−

K ( m ) -

+ c

Λ ( m ) -

−

K

+ c

Λ ( m

500 1000 1500 2000

Candidates / (1 MeV)

LHCb (a)

−

K

+ c

Λ → (2923)

c

Ξ

−

K

+ c

Λ → (2939)

c

Ξ

−

K

+ c

Λ → (2965)

c

Ξ

+

π

−

K

+ c

Λ →

+

(2923)

c

Ξ

−

K )

+

π

+ c

Λ → (

++ c

Σ →

+

(3055)

c

Ξ

−

K ) π

+ c

Λ → (

+ c

Σ → (3055)

c

Ξ

−

K )

+

π

+ c

Λ → (

++ c

Σ →

+

(3080)

c

Ξ

−

K ) π

+ c

Λ → (

+ c

Σ → (3080)

c

Ξ Background Additional component

Γ(Ξc(2923)0) = 7.1 ± 0.8 ± 1.8 MeV Γ(Ξc(2939)0) = 10.2 ± 0.8 ± 1.1 MeV Γ(Ξc(2965)0) = 14.1 ± 0.9 ± 1.3 MeV

<latexit sha1_base64="x5r/glpji4w14yCun2oW7xDRQ=">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</latexit><latexit sha1_base64="x5r/glpji4w14yCun2oW7xDRQ=">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</latexit><latexit sha1_base64="x5r/glpji4w14yCun2oW7xDRQ=">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</latexit><latexit sha1_base64="x5r/glpji4w14yCun2oW7xDRQ=">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</latexit>

m(Ξc(2923)0) = 2923.04 ± 0.25 ± 0.20 ± 0.14 MeV/c2 m(Ξc(2939)0) = 2938.55 ± 0.21 ± 0.17 ± 0.14 MeV/c2 m(Ξc(2965)0) = 2964.88 ± 0.26 ± 0.14 ± 0.14 MeV/c2

<latexit sha1_base64="ZoW0lrkJzxN87GTcN2K3b0QVtI=">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</latexit><latexit sha1_base64="ZoW0lrkJzxN87GTcN2K3b0QVtI=">AEXicbZPLjtMwFIbdhMtQbh1YsrGoZtRBKCTpfYE0gVskAaJdio1ncpx3da2Am2g6i7tkCT8MOseUJeBYkhNOmM2laS1Z+HdvfOeP7UcBlcq2/5QM8bNW7cP7pTv3rv/4GHl8FfhrHApIfDIBQDH0kSUE56iqADCJBEPMDcu5fvk7Xz8RIWnIP6hFREYMzTidUoyUDo0PS389n8woT8hHjoRAi2fLMqt5AzrGNbfr1k8u7JPjl8cw1ZbdgF7EoG25zY2wM+E0IPSeQ48hNRcseUf6yxf4woWel8PVuykOrn1jtW8wjgbTHs/D+4Htpo5YKthdTobYOuacy328Moe4ZN80c7fkAde4MYQwVbVmnb1qb0dWon/W7kJZcJOScHS1BYSzU+o+Rq5p3FVRjdj1HcYGlDodVyp2pa9GnBXOJmogmycjSv/vEmIY0a4wgGScujYkRolSCiKA7Ise7EkEcKXaEaGWnLEiBwlq1u6hEc6MoHTUOjJFVxF8ycSxKRcMF/vTMuWxbU0uG9tGKtpZ5RQHsWKcLxONI0DqEKYXnk4oYJgFSy0QFhQXSvEcyQVvphbGURodLvgs+2OklmAkVzij+vDHOK9uyKvmvpn+q8d6unrzLrDsAT8BTUgAPa4BS8BWegB7DhG1+Mr8Y387v5w/xp/lpvNUrZmcdga5i/wNyCi/h</latexit><latexit sha1_base64="ZoW0lrkJzxN87GTcN2K3b0QVtI=">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</latexit><latexit sha1_base64="ZoW0lrkJzxN87GTcN2K3b0QVtI=">AEXicbZPLjtMwFIbdhMtQbh1YsrGoZtRBKCTpfYE0gVskAaJdio1ncpx3da2Am2g6i7tkCT8MOseUJeBYkhNOmM2laS1Z+HdvfOeP7UcBlcq2/5QM8bNW7cP7pTv3rv/4GHl8FfhrHApIfDIBQDH0kSUE56iqADCJBEPMDcu5fvk7Xz8RIWnIP6hFREYMzTidUoyUDo0PS389n8woT8hHjoRAi2fLMqt5AzrGNbfr1k8u7JPjl8cw1ZbdgF7EoG25zY2wM+E0IPSeQ48hNRcseUf6yxf4woWel8PVuykOrn1jtW8wjgbTHs/D+4Htpo5YKthdTobYOuacy328Moe4ZN80c7fkAde4MYQwVbVmnb1qb0dWon/W7kJZcJOScHS1BYSzU+o+Rq5p3FVRjdj1HcYGlDodVyp2pa9GnBXOJmogmycjSv/vEmIY0a4wgGScujYkRolSCiKA7Ise7EkEcKXaEaGWnLEiBwlq1u6hEc6MoHTUOjJFVxF8ycSxKRcMF/vTMuWxbU0uG9tGKtpZ5RQHsWKcLxONI0DqEKYXnk4oYJgFSy0QFhQXSvEcyQVvphbGURodLvgs+2OklmAkVzij+vDHOK9uyKvmvpn+q8d6unrzLrDsAT8BTUgAPa4BS8BWegB7DhG1+Mr8Y387v5w/xp/lpvNUrZmcdga5i/wNyCi/h</latexit>

5400 ± 400 10400 ± 600 11700 ± 600

Will Barter, Tue 17:30, plenary

SLIDE 31

Excited Ξ0

c → Λ+ c K−

Also some curious structure at lower mass, ~100 MeV (red).
Could be additional feed-downs; could be additional state(s).
Described by empirical model (single Gaussian); effects on other

peaks in the fit are small & included as systematic uncertainties.

31 arXiv:2003.13649 : Observation of new baryons decaying to

Ξ0

c

Λ+

c K−

100 200 300

) [MeV]

−

K ( m ) -

+ c

Λ ( m ) -

−

K

+ c

Λ ( m

500 1000 1500 2000

Candidates / (1 MeV)

LHCb (a) 100 200 300

) [MeV]

−

K ( m ) -

+ c

Λ ( m ) -

−

K

+ c

Λ ( m

500 1000 1500 2000

Candidates / (1 MeV)

LHCb (b)

− K + c Λ → (2923) c Ξ − K + c Λ → (2939) c Ξ − K + c Λ → (2965) c Ξ + π − K + c Λ → + (2923) c Ξ − K ) + π + c Λ → ( ++ c Σ → + (3055) c Ξ − K ) π + c Λ → ( + c Σ → (3055) c Ξ − K ) + π + c Λ → ( ++ c Σ → + (3080) c Ξ − K ) π + c Λ → ( + c Σ → (3080) c Ξ Background Additional component −

K

+ c

Λ → (2923)

c

Ξ

−

K

+ c

Λ → (2939)

c

Ξ

−

K

+ c

Λ → (2965)

c

Ξ

+

π

−

K

+ c

Λ →

+

(2923)

c

Ξ

−

K )

+

π

+ c

Λ → (

++ c

Σ →

+

(3055)

c

Ξ

−

K ) π

+ c

Λ → (

+ c

Σ → (3055)

c

Ξ

−

K )

+

π

+ c

Λ → (

++ c

Σ →

+

(3080)

c

Ξ

−

K ) π

+ c

Λ → (

+ c

Σ → (3080)

c

Ξ Background Additional component

Will Barter, Tue 17:30, plenary

SLIDE 32

Last words

Upgrade work has been paused, but is now ramping back up.
Analysis work continuing
Results presented in several areas:
Searches for NP with rare & electroweak penguin decays
Precision CKM & CPV studies
Spectroscopy
... and there is much more I did not have time for
... heavy ions, electroweak, dark photon searches, isospin, ...
Anomalies are still there, still tantalising, still not close to

for individual tests of the SM.

More details in LHCb talks throughout the conference!

5σ

32

SLIDE 33

33

˜ t

SLIDE 34

Excited Λ0

b → Λ0 bπ+π−

Selection is key. Separate BDT classifiers for studying low-mass

and high-mass regions.

Train with MC as signal, same-sign data as background
Also require

in high-mass region

Low-mass region is straightforward. Simultaneous fit to 6 spectra:

pt(π+π−) > 250 MeV

34 arXiv:2002.05112: Observation of a new baryon state in the mass spectrum

Λ0

b π+π−

5.91 5.92 5.93 100 200 300 400 5.91 5.92 5.93 20 40 5.91 5.92 5.93 20 40

Λb(5912)0 Λb(5920)0 background total

Candidates/(0.4 MeV) mΛ0

bππ

[GeV] Λ0

b → Λ+ c π−

Λ0

bπ+π−

Λ0

bπ+π+

Λ0

bπ−π−

LHCb

5.91 5.92 5.93 50 100 5.91 5.92 5.93 10 20 5.91 5.92 5.93 10 20

Λb(5912)0 Λb(5920)0 background total

Candidates/(0.4 MeV) mΛ0

bππ

[GeV] Λ0

b → J/ψpK−

Λ0

bπ+π−

Λ0

bπ+π+

Λ0

bπ−π−

LHCb

Known and

bserved, properties

remeasured. Natural widths of both states consistent with zero.

Λb(5912)0 Λb(5920)0

ΓΛb(5912)0 < 0.25 (0.28) MeV ΓΛb(5920)0 < 0.19 (0.20) MeV

mΛb(5912)0 = 5912.21 ± 0.03 ± 0.01 ± 0.21 MeV , mΛb(5920)0 = 5920.11 ± 0.02 ± 0.01 ± 0.21 MeV ,

mΛb(5920)0 − mΛb(5912)0 = 7.896 ± 0.034 MeV

Excited Λ0

b → Λ0 bπ+π−

Now the high-mass region:

35 arXiv:2002.05112: Observation of a new baryon state in the mass spectrum

Λ0

b π+π−

5.95 6 6.05 6.1 6.15 6.2 50 100 150 5.95 6 6.05 6.1 6.15 6.2 200 400 600 5.95 6 6.05 6.1 6.15 6.2 50 100 150 5.95 6 6.05 6.1 6.15 6.2 50 100 150

Λ∗∗0

b

Λb(6146)0 Λb(6152)0 Σbπ Σ∗

bπ

comb. background

total background total

Candidates/(2 MeV) mΛ0

bππ

[GeV] Λ0

b → Λ+ c π−

Λ0

bπ+π−

Λ0

bπ+π+

Λ0

bπ−π−

LHCb

5.95 6 6.05 6.1 6.15 6.2 50 100 150 200 5.95 6 6.05 6.1 6.15 6.2 50 100 5.95 6 6.05 6.1 6.15 6.2 50 100

Λ∗∗0

b

Λb(6146)0 Λb(6152)0 Σbπ Σ∗

bπ

comb. background

total background total

Candidates/(4 MeV) mΛ0

bππ

[GeV] Λ0

b → J/ψpK−

Λ0

bπ+π−

Λ0

bπ+π+

Λ0

bπ−π−

LHCb

cut suppresses events at low mass

pt(π+π−) > 250 MeV

Broad structure interpreted as resonance.

Λ**0

b

Λb(2S)0

> 14σ > 7σ

∆mΛ∗∗0

b

= 452.7 ± 2.9 ± 0.5 MeV ΓΛ∗∗0

b

= 72 ± 11 ± 2 MeV mΛ∗∗0

b

= 6072.3 ± 2.9 ± 0.6 ± 0.2 MeV

Excited Λ0

b → Λ0 bπ+π−

Nice coincidence: on the same day* that this analysis was shown

as a preliminary result (22 Jan 2020, Bormio), a related study by CMS appeared on the arXiv (PLB 803 (2020) 135345).

36

In addition, a broad excess of events is observed in the region 6040–6100 MeV, not present in the same-sign Λ0

bπ±π± distribution. If it is fit with a single Breit-Wigner function, the returned

mass and width are 6073 ± 5 (stat) MeV and 55 ± 11 (stat) MeV. However, it is not excluded that this enhancement is an overlap of more than one state with close masses or is created by the partially reconstructed decays of higher-mass states. More data are needed to elucidate the nature of this excess. 6σ in the baseline fit, and varies between 5.4 and 6.5σ with the changes in the fit range and the model used to estimate the systematic uncertainties, as detailed in Section 6. The broad enhancement has a local statistical significance of about 4σ. Resonances with masses between 6200 and 6400 MeV have been also considered in the fit model and no significant excess was

6.0 6.1 6.2 6.3 6.4

[GeV]

−

π

+

π

b

Λ

m

20 40 60 80 100 120 140

Candidates / 5 MeV

Data Fit Signals

Comb. bkg.

(13 TeV)

1

up to 140 fb

CMS

M(Λb(5912)0) = 5912.32 ± 0.12 ± 0.01 ± 0.17 MeV, M(Λb(5920)0) = 5920.16 ± 0.07 ± 0.01 ± 0.17 MeV, M(Λb(6146)0) = 6146.5 ± 1.9 ± 0.8 ± 0.2 MeV, M(Λb(6152)0) = 6152.7 ± 1.1 ± 0.4 ± 0.2 MeV,

... i.e. CMS also sees excess with local significance of 4σ

CMS results

* CMS e-print submitted 17 Jan but due to weekend & holiday didn't appear until the early hours of 22 Jan.

Will Barter, Tue 17:30, plenary

SLIDE 37

CPV observables in and with

B± → DK± B± → Dπ± D → K0

SK±π∓

Uses CLEO model-independent input for
Reports several inputs for measurements
... but not enough constraints in this analysis alone to get useful value of
Several disjoint subsamples of events, splitting like:
vs
vs
Same-sign

vs opposite-sign

inside or outside

region (±100 MeV around mass)

reconstructed from long vs downstream tracks

D → K0

SK±π∓

γ

γ B → DK B → Dπ B+ B− B → D(K0

SK±π∓)π±

B → D(K0

SK∓π±)π±

m(K0

Sπ)

K*+ K*+ K0

S

37 arXiv:2002.08858: Measurement of

bservables in

and with decays

CP B± → DK± B± → Dπ± D → K0

SK±π∓

Mark Whitehead, Fri 17:30, plenary Mirco Dorigo, Thu 15:25, Flavour

SLIDE 38

with

B± → D(K/π)± D → K0

SK±π∓

38 arXiv:2002.08858: Measurement of

bservables in

and with decays

CP B± → DK± B± → Dπ± D → K0

SK±π∓

non-K∗+ region K∗+ region N DK±

SS

266 ± 27 715 ± 37 N DK±

OS

336 ± 27 217 ± 22 N Dπ±

SS

3304 ± 73 8977 ± 106 N Dπ±

OS

4686 ± 76 3471 ± 66

−0.10 −0.05 0.00 0.05 0.10

ADπ

SS

LHCb

Expected ±1σ ±2σ

−0.10 −0.05 0.00 0.05 0.10

ADπ

OS

−0.4 −0.2 0.0 0.2 0.4

ADK

SS

−0.4 −0.2 0.0 0.2 0.4

ADK

OS

0.04 0.05 0.06 0.07 0.08 0.09 0.10

RDK/Dπ

SS

0.04 0.05 0.06 0.07 0.08 0.09 0.10

RDK/Dπ

OS

2.00 2.25 2.50 2.75 3.00 3.25 3.50

RSS/OS

π

Yields (summed over charge) Measured observables, compared to SM expectations (from world-avg inputs) for region

K*+

ADπ

SS = −0.020 ± 0.011 ± 0.003 ,

ADπ

OS =

0.007 ± 0.017 ± 0.003 , ADK

SS =

0.084 ± 0.049 ± 0.008 , ADK

OS =

0.021 ± 0.094 ± 0.017 , RSS/OS = 2.585 ± 0.057 ± 0.019 , RDK/Dπ

SS

= 0.079 ± 0.004 ± 0.002 , RDK/Dπ

OS

= 0.062 ± 0.006 ± 0.003 , ADπ

SS = −0.034 ± 0.020 ± 0.003 ,

ADπ

OS =

0.003 ± 0.015 ± 0.003 , ADK

SS =

0.095 ± 0.089 ± 0.018 , ADK

OS = −0.038 ± 0.075 ± 0.011 ,

RSS/OS = 0.706 ± 0.019 ± 0.009 , RDK/Dπ

SS

= 0.081 ± 0.008 ± 0.004 , RDK/Dπ

OS

= 0.073 ± 0.006 ± 0.002 .

region

K*+

non- region

K*+

Mark Whitehead, Fri 17:30, plenary Mirco Dorigo, Thu 15:25, Flavour

SLIDE 39

with

B± → D(K/π)± D → K0

SK±π∓

Examples (just a subset!) for same-sign decays; fits inside

region

K*+

39 arXiv:2002.08858: Measurement of

bservables in

and with decays

CP B± → DK± B± → Dπ± D → K0

SK±π∓

5200 5400 5600 m([K0

SKπ+]DK) [MeV/c2]

25 50 75 100 125 Candidates / (15 MeV/c2) LHCb

Data Total B± ! Dπ± B± ! DK± Combinatorial

Part. reco.

Charmless B0

s ! DK±π

5200 5400 5600 m([K0

SK+π−]DK+) [MeV/c2]

25 50 75 100 125 Candidates / (15 MeV/c2) LHCb 5200 5400 5600 m([K0

SK−π+]Dπ−) [MeV/c2]

500 1000 1500 2000 Candidates / (15 MeV/c2) LHCb 5200 5400 5600 m([K0

SK+π−]Dπ+) [MeV/c2]

500 1000 1500 2000 Candidates / (15 MeV/c2) LHCb

Mirco Dorigo, Thu 15:25, Flavour Mark Whitehead, Fri 17:30, plenary