on behalf of
The CMS Collaboration

B physics resultsfrom CMS
Alexander Tulupov2
Sergey Polikarpov1,2
1LPI RAS, 2NRNU MEPhIThe work was supported by the Ministry of Scienceand Higher Education of the Russian Federation,
Project "Fundamental properties of elementary
particles and cosmology" No 0723-2020-0041.

Introduction
Recent B Physics and Quarkonia Preliminary
Results at CMS (July 2021):• CMS-PAS-BPH-18-004 - Observation of 𝐵! →
𝜓 2𝑆 𝐾"!𝜋 #𝜋 $ and 𝐵%! → 𝜓 2𝑆 𝐾"! decays• CMS-PAS-BPH-21-004 - Observation of

triple J/ψ meson production in proton-proton
collisions at √s= 13 TeV

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2

I. Observation of! # $!
𝐵 → 𝜓 2𝑆 𝐾" 𝜋 𝜋 and!
!
𝐵% → 𝜓 2𝑆 𝐾" decays
CMS-PAS-BPH-18-004

Motivation
Many exotic states have been observed in the last 15
years, and the nature of most of them is still unclear±→ 𝐽/𝜓 𝜋 " BELLE (10.1103/PhysRevD.88.074026)±±
🌀 𝑍# 4200 → 𝐽/𝜓 𝜋 BaBar (10.1103/PhysRevD.79.112001)
🌀 𝑍# 4430 ± → 𝜓(2𝑆) 𝜋 ± BELLE (10.1103/PhysRevD.80.031104)
🌀 𝑋(3915) → 𝐽/𝜓𝜔 BELLE (10.1103/PhysRevD.81.031103)
🌀 𝑃# 4457 " → 𝐽/𝜓 𝑝 LHCb (10.1103/PhysRevLett.115.072001)
🌀 𝑍#% 4220 " → 𝐽/𝜓 𝐾 " LHCb (CERN-EP-2021-025)
Candidates / (10 MeV)

🌀 𝑍с 3900

700

X (4630)

600

X (4500)

LHCb

X (4700)

700

LHCb

600

700

X NR

500

500

400

X (4140)

400

400

X (4685)300

300

X (4150)

200

200

100

100

300
200

Candidates / (10 MeV)100

X (4274)

Z cs(4000)
Z cs(4220)

700

K 0−

600

K 1+

500
400

1.5

2

0
700

4.2

4.4

4.6

4.8 3.6700

LHCb 600

LHCb 600

K 2+

500

500

K 2−

400

400

300

300

200

200

100

100

100

0

0
2
mφ K + [GeV]

300
200

−

K1

BackgroundTotal fit
Data 9 fb-1

1.5

4.2

4.4

LHCb

600

500

0
4.6
4.8 3.6
mJ/ψ φ [GeV]

Belle

3.8

4

4.2

LHCb

3.8

4

Decays with charmonium
in final states could be agood laboratory for CPviolation measurements.

4.2
mJ/ψ K + [GeV]

20th
LomonosovonFigure 3: Distributions of K + (left), J/(middle) and The
J/ K +(right)invariant masses Conferencefor21.08.2021+ ! J/
the B
K + candidates (black data points) compared with the
fit results (red solidlines) Physics
Elementary
Particleof the default model (top row) and the Run 1 model (bottom row).

4

Introduction

B(B0s ! (2S)K0S )fs ✏ (B0 ! (2S)K0S ) N (B0s ! (2S)K0S )
Rs ⌘
=
·
·
, and
B(B0 ! (2S)K0S )fd ✏ (B0s ! (2S)K0S ) N (B0 ! (2S)K0S )0
B(B0 ! (2S)K0S ⇡ + ⇡ ! )✏ (B0 !!# (2S)KN (B0 ! ! (2S)K0S ⇡ + ⇡ )
$
S) !
We
for0 the new0B →=ψ 2S0 K " π π and
B" →· ψ 2S K0 " decays withR⌘,
⇡ + ⇡ search
0
+
0)
B(B
!
(2S)K
)
✏
(B
!
(2S)K
⇡
⇡
)
N
(B
!
(2S)K
S
S
CMS pp collision 2017-2018
data. The relative
branching fraction S

ratios are measured using the relations:fs
B(B0s ! (2S)K0S ) fs
✏ (B0 ! (2S)K0S ) N (B0s ! (2S)K0S )
Rs ·
⌘
·
=
·
, and
fd
B(B0 ! (2S)K0S ) fd
✏ (B0s ! (2S)K0S ) N (B0 ! (2S)K0S )B(B0 ! (2S)K0S ⇡ + ⇡ )✏ (B0 ! (2S)K0S )N (B0 ! (2S)K0S ⇡ + ⇡ )R⇡ + ⇡ ⌘=·,B(B0 ! (2S)K0S )✏ (B0 ! (2S)K0S ⇡ + ⇡ )N (B0 ! (2S)K0S )Where N is number of signal events in data, 𝜖 is efficiency.
The 𝐵! → ψ 2S K !" decay is used for the normalization thanks to it’ssimilar topology and kinematics to the decays of interest.
𝑓% /𝑓& – the ratio of the 𝐵%! and 𝐵! production cross sections.

21.08.2021

The 20th Lomonosov Conference on
Elementary Particle Physics

5Selection criteria|M(𝑲𝟎𝑺 ) - MPDG(𝑲𝟎𝑺 )|< 20 MeV𝝅$𝝅#

The reconstructed 𝝍(𝟐𝑺) decays into
two muons that must also satisfy
general muon identification criteria
and basic kinematic requirements to
reduce the combinatorial
background.

𝑲𝟎𝒔
𝝅# 𝝅$

We also apply standard
topological requirement on
the 𝑩𝟎 and 𝑲𝟎𝒔 flight lengths.

Proton beam

𝒔=13 TeV

21.08.2021

𝑩

𝝍(𝟐𝑺)
Proton beam𝝁$𝝁#

The CMS experiment has aperfect muon identification:in dimuon channel, 𝝍(𝟐𝑺)
separates from othercharmonium states by only
requiring mass window:M(𝝍 𝟐𝑺 ) in [3.55, 3.95] GeVPrimary Vertex – the vertex of ppinteraction. It’s the vertex, where Bmeson was born. PV selected as theone with the smallest pointing angle.
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6

Efficiencies
Efficiencies were obtained from phase-space MC samples.
Measured ratios of efficiencies are:𝜖 𝐵! → 𝜓 2𝑆 𝐾%!
= 1.019 ± 0.013;
𝜖( 𝐵%! → 𝜓 2𝑆 𝐾%! )𝜖 𝐵! → 𝜓 2𝑆 𝐾%!
= 2.29 ± 0.03
𝜖(𝐵! → 𝜓 2𝑆 𝐾%! 𝜋 #𝜋 $)🔅 For the 𝐵%! channel efficiency is very close to the one for 𝐵! due tothe same products of the reactions and similar masses of the
decaying particles.
🔅 The efficiency is lower for 𝐵! → 𝜓 2𝑆 𝐾%! 𝜋 #𝜋 $ channel due toadditional track reconstruction.
The ratios agree with our expectations
21.08.2021

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7"𝜓(2𝑆)𝐾! mass distribution
103.7 fb-1 (13 TeV, 2017-2018)

Candidates / 3 MeV

CMS Preliminary
103

Signal yields:
𝑩𝟎 : 16660 ± 140
𝑩𝟎𝒔 : 113 ± 23

Data
Fit
0
B signal
B0s signal
Comb. bkg.

2x Gaus
2x Gaus

2

𝟎

10

𝑩

Exp

5.2σ

Background: exponentialfunction

Signal: 2-x Gaus with common
mean for both peaks.
B L → ψ(2S)K LM parameters arefloating.
𝝈 𝑩𝟎𝒔
𝝈𝑴𝑪 𝑩𝟎𝒔= 𝑴𝑪 𝟎
𝝈 𝑩𝟎
𝝈
𝑩

𝐁𝐬𝟎

10
5.20

5.25

5.30

5.35

5.40

5.45

mψ (2S)K0 [GeV]sFirst
observation!

The obtained significance is 5.2σ and varies in the range 5.1–5.4σ within thevariations of the fit model used in the estimation of the systematic
uncertainties. (See next slides)
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8

" # $
𝜓 2𝑆 𝐾! 𝜋 𝜋 mass distribution
Candidates / 3 MeV

Data
Fit
B0 signal
B0s → ψ (2S)K0sK±πComb. bkg.

600
500
400
300
200

Signal yield:
𝑩𝟎 : 3498 ± 87

100
0
5.10

103.7 fb-1 (13 TeV, 2017-2018)

5.15

5.20

Background: exponentialfunction

Signal: 2-x Gaus with common±

CMS Preliminary

mean

> 30σ

The significance of the peakexceeds 30σ

First
5.25
5.30
5.35
5.40
mψ (2S)K π π [GeV] observation!
0 + −s

𝑩𝟎𝒔 → 𝝍 𝟐𝑺 𝑲𝟎𝑺 𝑲±𝝅∓: “Reflection” from misreconstructed 𝐵%& → 𝜓 2𝑆 𝐾'& 𝑲± 𝜋 ∓decay with kaon reconstructed as pion. The shape parameters are fixed to theMC values and the normalization is free.
21.08.2021

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Elementary Particle Physics

9In search of exotics
sPlot distributions of six 2-body intermediate invariant masses from the 𝐵 & →𝜓 2𝑆 𝐾'& 𝜋 " 𝜋 ) decay in data compared to MC.
MC

250

Weighted MC

200
150

There may be∗ 892 "
exotics𝐾here

100
50

600

Bkg.-subtracted data

500

MC
Weighted MC

400
300
200

𝐾 ∗ 892 "

100

3.9

4.0

4.1

4.2

4.3

4.4

4.5

0.7

4.6

0.8

0.9

1.0

1.1

1.2

Bkg.-subtracted data

600

MC

500

Weighted MC

400
300
200

CMS Preliminary

1.3

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0
mπ +π − [GeV]

300
200

There may be
0 exotics here

1.4

4.2

4.3

4.4

4.5

4.6

4.7

Bkg.-subtracted data
MC

250

Weighted MC

200
150
100

There may be
exotics here
3.9

4.0

4.1

4.2

4.3

CMS Preliminary

4.9

4.5

4.6
mψ (2S)π + [GeV]-1

103.7 fb (13 TeV, 2017-2018)

600

Bkg.-subtracted data

500

MC
Weighted MC

400
300
200

𝐾 ∗ 892 $

100
4.4

4.8

mψ (2S)K0 [GeV]s00

Weighted MC400103.7 fb-1 (13 TeV, 2017-2018)

300

50

𝜌 770 #

100

MC

s

Candidates / 30 MeV

Candidates / 45 MeV

700

103.7 fb-1 (13 TeV, 2017-2018)

Bkg.-subtracted data

500mK0π − [GeV]mψ (2S)π − [GeV]CMS Preliminary

600

100

0

0

103.7 fb-1 (13 TeV, 2017-2018)

CMS Preliminary

Candidates / 50 MeV

Bkg.-subtracted data

103.7 fb-1 (13 TeV, 2017-2018)

Candidates / 40 MeV

Candidates / 30 MeV

300

CMS Preliminary

Candidates / 40 MeV

103.7 fb-1 (13 TeV, 2017-2018)

CMS Preliminary

0
0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

mK0π + [GeV]s

The data (black) shows clear signs of the known 𝐾 ∗ 892 ± and 𝜌 770 L resonances
in 𝐾SL 𝜋 ± and 𝜋 T𝜋 U systems, but not the exotics like 𝑍VW 4220 T…
21.08.2021

The 20th Lomonosov Conference on
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10In search of exotics
400

103.7 fb-1 (13 TeV, 2017-2018)

CMS Preliminary350

Bkg.-subtracted data

300

MC

250

Weighted MC

200
150
100

𝐾\ 1270 L

50
0
0.8

0.9

1.0

1.1

1.2

1.3

103.7 fb-1 (13 TeV, 2017-2018)

CMS Preliminary

Candidates / 50 MeV

Candidates / 30 MeV

sPlot distributions of four 3-body intermediate invariant masses from the 𝐵 & →𝜓 2𝑆 𝐾'& 𝜋 " 𝜋 ) decay in data compared to MC
500
MC
Weighted MC

300
200

There may be
exotics here

100
0

1.4

1.5
m 0 + − [GeV]

4.4

4.5

4.6

4.7

4.8

CMS Preliminary

103.7 fb (13 TeV, 2017-2018)

Bkg.-subtracted data

600

MC

500

Weighted MC

400

There may be
exotics here

300
200

0

4.0

4.1

4.2

21.08.2021

4.3

4.4

4.5

4.6

4.7
mψ (2S)π +π − [GeV]

5.0

5.1

-1

CMS Preliminary

103.7 fb (13 TeV, 2017-2018)500
Bkg.-subtracted data

400

MC
Weighted MC

300
200

There may be
exotics here

100

100

4.9

mψ (2S)K0π − [GeV]s-1

Candidates / 50 MeV

Candidates / 45 MeV

K sπ π700

The data (black)shows a hint of the𝐾\ 1270 L → 𝐾SL𝜋 T𝜋 U
but not the narrowexotic structure…

Bkg.-subtracted data

400

0

4.4

4.5

4.6

4.7

4.8

4.9

5.0

5.1

mψ (2S)K0π + [GeV]s

The 20th Lomonosov Conference on
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11

Systematic
uncertainties
Table 1: Systematic uncertainties (in %) of the measured branchin
The systematic uncertainty related to the
choice of the fit model is evaluated by testing
different fit models: the largest deviation in
the measured ratio from the baseline value istaken as systematic uncertainty.
MC samples have finite volume

SourceRs

R⇡ + ⇡

Background model
Signal model
Shape of reflection
Finite size of MCIntermediate resonances
Tracking eﬃciency

2.5
1.5
�
1.3
�
�

0.8
0.8
0.5
1.1
5.0
4.2

MC simulation does not take into
account the intermediate resonancestructure, leading to significant disagreement
Total
3.2
6.7
between data and MC in intermediate mass
distributions, what leads to a potential bias in
the efficiency. To estimate the corresponding
For the ratio 𝑅]$]% , we consider0systematic uncertainty, the MC sample
fs is B(Bs an! additional(2S)K0S ) uncertainty
fs
due to
R
·
=
·
=
(0.69
±
0.14 (stat) ± 0.02
s data,reweighted to be consistent with the0) fefficiencyof2
additionalfd
B(B0 tracking! (2S)Kd
S
and the difference between the baseline
pions of 4.2%
efficiency and the efficiency obtainedon theB(B0s !
(2S)K0S )Rs == (3.33 ± 0.69 (stat) ± 0.11 (syst) ± 0.74
weighted MC is taken as a systematic
B(B0 ! (2S)K0S )uncertainty.
21.08.2021

B(B0 ! (2S)K0S ⇡ + ⇡ )= (48.0 ± 1.3 (stat) ± 3.2
R⇡ + ⇡ =0 ! (2S)K0 )B(BThe 20th Lomonosov Conference on
S
Elementary Particle Physics

12Results
The first observation of the decays 𝑩𝟎𝒔 → 𝝍 𝟐𝑺 𝑲𝟎𝑺 and
𝟎 → 0𝝍 𝟐𝑺 𝑲𝟎 𝝅0# 𝝅$ and estimation the branchingfs 𝑩 B(B𝑺 S ) fss ! (2S)K=fraction·= (0.69 ± 0.14 (stat) ± 0.02 (syst))%,ratios:00
fd
B(B ! (2S)K ) fd
S

0 0
0
(2S)K
fs
B0sfs! B(B
(2S)K
)
s !
S)
S
=
(0.69±±0.11
0.14(syst)(stat)±±0.74(f0.02 (syst))%,= (3.330±·0.69=(stat)s /fd ))%, and
000(2S)KS ) fd
B fd! B(B
(2S)K!
S)

0 0
B0s ! B(B(2S)K!S ) (2S)K0S ⇡ + ⇡ )+⇡= (3.33 ±0 0.69 =(stat)
±±
0.11
=
(48.0
1.3(syst)(stat)±±0.74(f
3.2 (syst))%.
s /fd ))%, and00
B ! (2S)KB(B S )! (2S)KS )+⇡B(B0 ! (2S)K0S ⇡ + ⇡ )Inspectionof the phase-space
distributionsof the== (48.0 ± 1.3(stat) ± 3.2 (syst))%.
0
0
𝐵! →B(B𝜓 2𝑆!𝐾 !(2S)K𝜋 #𝜋 $S )decay does not reveal any"

additional exotic narrow structure.
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The 20th Lomonosov Conference on
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13II. Observation of
triple J/ψ meson productionin proton-proton collisions at√s = 13 TeV
CMS-PAS-BPH-21-004

Motivation• Study unknown energy evolution of transverse(impact parameter b) proton shape• Probe generalized PDFs (x,Q2 and b) of the proton• Control backgrounds for rare SM resonance decays& BSM production of multiple heavy particles.
• Studies so far focused on double-parton scatterings(DPS), triple-parton scatterings (TPS) process neverobserved so far

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15

Introduction
This work presents the first observation of the production of three J/ψ
mesons in pp collisions, using 133 fb−1 of data collected at √s = 13 TeV
by the CMS experiment.
The J/ψ mesons are reconstructed in their dimuon decay mode.
The extracted cross section iscompared to theoretical
expectations based on SPS,
DPS, and TPS contributions,and the effective DPS crosssection σeff,DPS associated tothe process is derived.

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The 20th Lomonosov Conference on
Elementary Particle Physics

16Prompt and non prompt
contributions
The analysis of the 6µ final state offers a very clean experimental signature for triple-J/ψ
production, including prompt and non prompt J/ψ mesons

prompt21.08.2021

detached

The 20th Lomonosov Conference on
Elementary Particle Physics

17

Selection & Reconstruction
𝑝𝑝 → 𝐽/𝝍 𝐽/𝝍 𝐽/𝝍 𝑋
6𝜇Each of the reconstructed
𝐉/𝝍 decays into two
oppositely charged muons.
No muon is shared between
2 J/ψ candidates

For all muons
For all J/y mesons

21.08.2021

The CMS experiment has aperfect muon identification:in dimuon channel, 𝐉/𝝍
separates from othercharmonium states by only
requiring mass window:
𝟐. 𝟗 𝑮𝒆𝑽 < 𝒎 𝝁& 𝝁' < 𝟑. 𝟑 GeV

pT > 3.5 GeV for |h | < 1.2
pT > 2.5 GeV for 1.2 < |h | < 2.4
pT > 6 GeV and |y| < 2.4
2.9 < mµ+ µ < 3.3 GeV

Eliminating the possibility ofaccidental combinations ofmuons from different pp
pileup collisions

Each of the candidates have tooriginate from a common vertex witha probability greater than 0.5%, as
determined by a Kalman vertex fit.

The 20th Lomonosov Conference on
Elementary Particle Physics

18

Signal extraction
The signal is extracted with a three-dimensional unbinned extended
maximum likelihood fit, in the three dimuon invariant mass
𝑚 𝜇" 𝜇) 1,2,3 variables.

s=13 TeV, L = 133 fb-1

CMS Preliminary

9

Data

8

Total

7

J/ψ J/ψ J/ψ signal

6

10

CMS Preliminarys=13 TeV, L = 133 fb-1

9

Data

8

Total

7

J/ψ J/ψ J/ψ signal

6

𝟓. 𝟎#𝟐.𝟔$𝟏.𝟗
eventsEvents / 50 MeV

10Events / 50 MeV

Events / 50 MeV

Signal: gaussian with resolution fixed from MC fit and mean fixed to PDG(%,-./0)(%,-./0)(%,-./0)J/ψ mass - 𝐽/𝜓*∩ 𝐽/𝜓2∩ 𝐽/𝜓3Background: exponential function – 7 rest of the combinations of the three
J/ψ to be signal or background10

CMS Preliminary

9

Data

8

Total

7

J/ψ J/ψ J/ψ signal

6

5

5

4

4

3

3

3

2

2

2

1

1

1

0
2.9

3

3.1

3.2
+ −

3.3

m[µ µ ] [1] [GeV]

21.08.2021

0

2.6

2.8

5
4

3

3.2
+ −

m[µ µ ] [2] [GeV]

The 20th Lomonosov Conference on
Elementary Particle Physics

s=13 TeV, L = 133 fb-1

0

> 𝟓𝝈

2.6

2.8

3

3.2
+ −

m[µ µ ] [3] [GeV]

19

3.4%, respectively, and assigned as corresponding systematicon) indicates that the five measured triple-J/y signal events
ng from the muon reconstruction efficiency are examined byeing consistent with “2 nonprompt + 1 prompt J/y”, plus onof each (pT , h) bin to float within their assigned precision, an
rompt + 2 prompt J/y”, “3 nonprompt J/y”, or “3 prompt J/ysection extraction. The maximal variation observed is ±1.0%.
section used
for triple-J/yproduction measured
in theefficiency
fiducial reg
tssamplefor the determinationof the trigger
is
3J/y
3
only
components,
leadingtoapropagatedonthed via s(pp ! J/y J/y J/y X) = Nsig /(e Lintuncertainty
BJ/y
)
,
whe
+
!µ µ
uncertainty
fromintegrated
the integrated
luminosity
meas
d%signal
events,isLadded
the
total
luminosity,
and
e
=
int
l 3.0%Number
uncertainty
isreconstruction,
assigned due tothesimulation sampleofomposedof trigger,
andidentification
compons
extracted
signal
=(5.961± 0.033)%efficiencies
value propagates
into
±
1.7%
on
the
+
"𝟐.𝟔
3
!ationµ µ andreconstruction
areextracted
withthe(5.96% ± 0.03%) ta
events - 𝟓. 𝟎)𝟏.𝟗+in
ources of systematic
uncertainties
are summarizedTable
2.
correction
factors total
from
the
large
inclusive
J/y
!
µ
µ
data
sa
efficiency coming
y
of
the
cross
sectionmeasurement
6.2%,
obtained are
by additotal
pend on the pT andof themuons,isthethecorrections
prop
from htrigger(84%),
integrated
reconstruction (78% )rature.
via two-dimensional maps, yielding eluminosity
The trigger
reco = 0.78.
- 133 fb-1
.84 from a crossstudy sectionof the MCmeasured
for samples.
triple J/y production, within the

Cross section measurement

1, is s(pp ! J/yJ/yJ/y X) = 272+141(stat) ± 17 (syst) fb.
104
1: Definition of the fiducial phase space for the triple-J/y cross
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The 20th Lomonosov Conference on
For all muonspT > 3.5 GeV for |h20| < 1.2
Elementary Particle Physics

Are J/ψ prompt or from b hadron
decays?

A classification of prompt and non prompt events is attempted via
2 approaches using J/ψ’s proper decay length (𝐿1/3 ):1.

Cut on 𝐿1/3 at 60µm

2.

Fit all individual measurements with prompt and nonprompt
templates derived from MC.

Both methods leads to same classification:
1 event

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1 event

2 events

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1 event

21

3.4%, respectively, and assigned as corresponding systematicng from the muon reconstruction efficiency are examined byof each (pT , h) bin to float within their assigned precision, an
section extraction. The
maximalvariationobserved
is±1.0%.
Table 2: Contributions to the systematic uncertainty of the s(pp ! J/y J/y J/y X)
ment,
in percent. The last row gives
thethesum intrigger
quadrature of allcomponents.
t sample
used
for
the
determinationofefficiency
is
Alternatives:
SourceRelative uncertainty
Crystal ballonly•• components,
leadingtoapropagateduncertainty
on theGaussian with floating resolution
J/y meson signal shape
0.8%
Dimuonbackground shape
3.4%% uncertainty
is added fromthecontinuum
integrated
luminositymeas• first- order polynomial
Muon reconstruction efficiency
1.0%• zeroth-order polynomial
l 3.0%
uncertainty
is assigned
due
tomeasurement
the simulation3.4%sample s
Trigger
efficiency
Obtainedas the largest deviation
MC sample size
3.0%
while varying the composition of=event(5.961
propagates
into ±1.7%
Integrated
luminosity
1.6% on thesample± 0.033)% value!µ + theµ MC
Branching fraction
1.7%
ources of systematic uncertainties
aresummarized
inTable 2.
Total
6.2%
y of the cross section measurement is 6.2%, obtained by addi
Discussion
the crossresultssection measurement is
The total systematic uncertainty
ofoftherature.
The total fortriple-J/ycrossJ/ψ
sectionproduction,is expected to correspondto thethesum ofthe contributi
6.2%. Measured cross section
triplewithinfiducial

Systematic uncertainties

region is

the SPS, DPS, and TPS processes schematically shown in Fig. 1, each of which containcombinations of prompt (p) and nonprompt (np) J/y contributions,

measured cross section for triple J/y production, within the=s+ s ++
s
=
141
⇣ 272
⌘± 17 (syst) fb.
1, is s(pp ! J/yJ/yJ/y Xs ) =(stat)
104= s +s
+s
+s
+
3J/y
tot

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3J/y
SPS
3p
SPS

3J/y
DPS
2p1np
SPS

3J/y
TPS
1p2np
SPS

3 np
SPS

⇣
⌘ ⇣
⌘
3p
2p1np
1p2np
3 np
3p
2p1np
1p2np
3 np
+ sDPS + sDPS + sDPS + sDPS + sTPS + sTPS + sTPS + sTPS .

The 20th Lomonosov Conference on

Under themost economical
assumption of factorization of multiple hard22scattering p
Elementary
Particle Physics
ties in terms of SPS cross sections, the DPS and TPS contributions to triple-J/y produc

DPS cross section
3;/=

Using the obtained result (𝜎9:9 ),theoretical predictions and MC
modeling, in a baseline “geometric”
approach that ignores parton
correlations, one can extract thevalue of the effective DPS crosssection:

CMS Preliminary

133 fb-1 (13 TeV)
CMS, s=13 TeV, J/ψ +J/ ψ +J/ ψ
CMS, s=8 TeV, J/ψ +J/ ψ
Phys.Rept. 889 (2020) 1-106

ATLAS, s=8 TeV, J/ψ +J/ ψ
Eur.Phys.J.C 77 (2017) 2, 76

LHCb, s=13 TeV, J/ψ +J/ ψ
JHEP 10 (2017) 068

D0, s=1.96 TeV, J/ψ +J/ ψ
Phys.Rev.D 90 (2014) 11, 111101

D0, s=1.96 TeV, J/ψ +Y
Phys.Rev.Lett. 117 (2016) 6, 062001

ATLAS, s=8 TeV, Z+b→J/ψ
Nucl.Phys.B 916 (2017) 132-142

ATLAS, s=8 TeV, Z+J/ψ
Phys.Rept. 889 (2020) 1-106

ATLAS, s=8 TeV, W+J/ ψ
Phys.Lett.B 781 (2018) 485-491<:.>
𝜎344,678 = 2.7<:.=
9:.; 𝑒𝑥𝑝 9:.; 𝑡ℎ𝑒𝑜 𝑚𝑏,

D0, s=1.8 TeV, γ +3-jet
Phys.Rev.D 81 (2010) 052012

CDF, s=1.8 TeV, γ +3-jet
Phys.Rev.D 56 (1997) 3811-3832

UA2, s=640 GeV, 4-jet
Physics Letters B 268 (1991) 145-154

where the first uncertainty is dueto the experimental precision3;/=of 𝜎9:9 and the second one isdue to the propagation of all
sources of theoreticaluncertainties

21.08.2021

CDF, s=1.8 TeV, 4-jet
Phys. Rev. D47 (1993) 4857-4871

CMS, s=7 TeV, 4-jet
Eur.Phys.J.C 76 (2016) 3, 155

CMS, s=7 TeV, 4-jet
Eur.Phys.J.C 76 (2016) 3, 155

CMS, s=13 TeV, 4-jet
SMP-20-007

CMS, s=7 TeV, W+2-jet
JHEP 03 (2014) 032

ATLAS, s=7 TeV, W+2-jet
New J.Phys. 15 (2013) 033038

CMS, s=13 TeV, WW
Eur.Phys.J.C 80 (2020) 1, 41

0

20

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60
σeff,DPS [mb]23

= (5.961 ± 0.033)% value propagates into ±1.7% on the curces Resultsof systematic uncertainties are summarized in Table 2. Tof the cross section measurement is 6.2%, obtained by addin
ature.
• The first observation of the concurrent production of 3 𝐽/𝜓 mesonsµ+µ• The fiducial
sectionbemeasuredcross crosssectionforis measured
triple J/yto production,
within the
1, is s(pp ! J/yJ/yJ/y X) = 272+141
104 (stat) ± 17 (syst) fb.
• Under “geometric” approach that ignores parton correlations,effective DPS cross section parameter is obtained
VT.X
𝜎MNN,PQR = 2.7VT.W
𝑒𝑥𝑝
ST.U
ST.U 𝑡ℎ𝑒𝑜 𝑚𝑏,
Within its large uncertainty, this value is consistent with similarly
extracted parameters from double-quarkonium measurements,
but significantly smaller than the effective DPS cross sections
derived from double-particle final states that include high-pT jets,
photons, and electroweak bosons.
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Conclusion
The CMS collaboration is still continuing theinvestigations in the B-physics and quarkonia
sector.
With RUN III data we will have great opportunities
for researching possible BSM processes.
More CMS publications here:
https://cms-results.web.cern.ch/cms-results/public-results/publications

Thank you foryour attention
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