(DM) (SM) (mediator)...Martino Borsato - USC DM signals!3 SM DM SM DM Direct detection Detect...

Dark Matter at

the LHC

Martino Borsato†

†Universida de Santiago de Compostela

on behalf of ATLAS, CMS, LHCb

(SM)(mediator)

(DM)

Martino Borsato - USC

What to look for

๏ Experimental constraints:

• Relic density observed

• (Thermal) DM mass > keV

• Effectively EM neutral

• Cosmologically stable

• No or small self-interaction

!2

Planck, AA 594(2016)A13

e.g. Lovell et al. MNRAS 439(2014)300-317

Stable charged particle and direct detection

"Bullet cluster" AJ 648(2006)L109-L113

or more Slatyer and Wu. PRD95(2017)2,023010

0

1000

2000

3000

4000

5000

6000

DTT

![µK

2]

30 500 1000 1500 2000 2500

!

-60

-30

0

30

60

∆D

TT

!

2 10

-600

-300

0

300

600

Planck 2015

Bullet cluster→ Compelling WIMP scenario


DM signals

!3

SM

DM

SM

DM

Direct detection

Detect interactions of the DM wind

XENON, Panda, Lux, DarkSide, …

Collider search

• Mediator → DM

(holistic search)

• Mediator → SM

(peak search)

Indirect detection

Signals from DM annihilation

FERMI, PAMELA, AMS, HESS, IceCube, CTA, …

Mediator → DM

!4


Mono-X searches at the LHC

๏ Exploit initial state radiation

• Missing energy + large-pT

‣ X = jet, photon, W, Z

๏ Main challenge: measure precisely SM backgrounds

• e.g. Z(νν)+X is irreducible

!5

SM DM

SM DM

X MET

χ

q

χ

q

q

Z′

χ χZ'

ν

q

χ

q

q

Z′

χ νZ


Mono-jet backgrounds

๏ Vector+jet backgrounds

• 50-80% is Z(νν)+jet (irreducible)

๏ Estimate using control regions:

• Z()+jet, removing from event

• W(ν)+jet, removing from event

• γ+jet, removing γ from event

!6

Events

/ G

eV

2−10

1−10

1

10

210

310

410

510

610

(13 TeV)-1

35.9 fb

CMS

monojet

Data

inv.→H(125)

= 2.0 TeVmed

Axial-vector, m

)+jetsννZ(

)+jetsνW(l

WW/WZ/ZZ

Top quark

+jetsγ(ll), γZ/

QCD

Data

/ P

red.

0.8

0.9

1

1.1

1.2

[GeV]miss

Tp

400 600 800 1000 1200 1400

Unc.

(Data

-Pre

d.)

2−

0

2

μuon (2)

μuon (1)Jet

nsMET

Remove µµ

arXiv:1712.02345


+je

tsγ

Z(ll)+

jets

/

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

0.22+jets DataγZ(ll)+jets /

+jets MC γZ(ll)+jets /

(13 TeV)-1

35.9 fb

CMS

monojet

[GeV]T

Hadronic recoil p

400 600 800 1000 1200 1400

Data

/ P

red.

0.5

1

1.5

Mono-jet backgrounds

๏ Ratio dσ(Z+jet)/dσ(W+jet)

and dσ(Z+jet)/dσ(γ+jet)

to simplify modelling

• Control-region to signal-region transfer factors from theory

๏ Progress in theory

• pT dependent NLO QCD+EW corrections of LO MC

• Including pT dependent correlations for corrections

• Ratios stable at few %

๏ Validation test on data

• Jet uncertainties cancel out

๏ Simultaneous fits of control

and signal regions

!7

LONLO QCDNNLO QCD

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

pp →Z(`+`−)+ jet / pp →W(`ν)+ jet @ 13 TeV

Z(`

+`−)+

jet

/W(`

ν)+

jet

100 200 500 1000 30000.9

0.95

1.0

1.05

pT,V [GeV]

R/

RN

LO

QC

D

3000

LONLO QCDNNLO QCD

0.01

0.02

0.03

0.04

0.05

0.06

pp →Z(`+`−)+ jet / pp →γ+ jet @ 13 TeV

Z(`

+`−)+

jet

/γ+

jet

100 200 500 1000 30000.9

0.95

1.0

1.05

pT,V [GeV]

R/

RN

LO

QC

D

)+je

tsν

Z(ll)+

jets

/ W

(l

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

0.22)+jets DataνZ(ll)+jets / W(l

)+jets MCνZ(ll)+jets / W(l

(13 TeV)-1

35.9 fb

CMS

monojet

[GeV]T

Hadronic recoil p

400 600 800 1000 1200 1400

Data

/ P

red.

0.5

1

1.5

arXiv:1712.02345 arXiv:1712.02345

Lindert et al arXiv:1705.04664 Lindert et al arXiv:1705.04664


Mono-jet results

๏ Results on simplified DM models

• Vector, axial-vector, scalar, pseudo-

scalar mediator (s-channel)

• 4 parameters: mDM, mmed, gSM, gDM

๏ Reach for gDM=1, mmed = 3 mDM:

• Up to ~1.6-1.8 TeV for mmed (vector)

• Below gSM ~ 0.1 for low mmed < 1TeV

!8

[GeV]VZm

0 1000 2000

[G

eV

]χ

m

0

500

1000exp

σ 2 ±Expected limit

)exp

σ 1 ±Expected limit (

)PDF, scale

theoryσ 1 ±Observed limit (

Relic Density (MadDM)

ATLAS-1

= 13 TeV, 36.1 fbs

Vector Mediator

Dirac Fermion DM

= 1.0χ

= 0.25, gq

g

95% CL limits

χ

= 2

mVZm

SM DM

SM DMmed

arXiv:1712.02345

arXiv:1711.03301


Mono-X results

๏ Searched in mono-jet, but also

mono-γ and mono-V

๏ No excess in ATLAS+CMS

(36/fb from 2015+2016)

• Best sensitivity to date

• In the era of precision searches

๏ 40/fb on tape from 2017 and

2018 run happening now

๏ Challenging analysis in future

high-luminosity upgrade

!9

Signature ATLAS CMS

Mono-jet 36/fb 1711.03301 36/fb 1712.02345

Mono-γ 36/fb 1704.03848 13/fb 1706.03794

Mono-V(had) 3.2/fb 1608.02372 36/fb 1712.02345

Mono-Z(lep) 36/fb 1708.09624 36/fb 1711.00431

Mono-H(γγ,ττb,b)36.1/fb 1706.03948,

1707.0130236/fb EXO-16-055

[GeV] medMediator mass M0 500 1000 1500 2000 2500

[G

eV

] D

MD

ark

matter

mass m

0

100

200

300

400

500

600

700

800

900

1000

LHCP 2017 PreliminaryCMS

Axial-vector mediator

Dirac DM = 1.0

DMg

= 0.25q

g

= 0l

gExclusion at 95% CL

Observed

Expected

[EXO-16-048]

)-1 (35.9 fbDM + j/V(qq)

[EXO-16-039]

)-1 (12.9 fbγDM +

[EXO-16-052]

)-1 (35.9 fbDM + Z(ll)

DM = 2 x m

MedM

0.12≥ 2 hcΩ

LHCP 2017 PreliminaryCMS

Axial-vector mediator

Dirac DM = 1.0

DMg

= 0.25q

g

= 0l

g


SUSY searches

๏ SUSY provides a candidate for DM

• χ0 down to 100 GeV still allowed

• Many different searches constraining DM candidate

• Interplay with direct searches investigated with global fits

!10

pMSSM11 EPJC78(2018)3-256

E.Bagnaschi, K.Sakurai, MB, et al

100 101 102 103

mχ0

1[GeV]

10−50

10−48

10−46

10−44

10−42

10−40

10−38

σSI

p[c

m2]

PANDAX-II

XENO

N1T

LUX

XENONnT

XENON1T

LZ

CRESST-II

CDMSlite

CDEX-1

pMSSM11 w/ LHC13 : best fit, 1σ, 2σ, 3σpMSSM11 w/o LHC13 : best fit, 1σ, 2σ, 3σ

µ > 0, Ωχ0

1

= ΩCDM

mAMSB EPJC77(2017)4-268

E.Bagnaschi, MB, K.Sakurai, et al

http://inspirehep.net/record/1633397

http://inspirehep.net/record/1504084


DM from Higgs decays

๏ Powerful search channel if mDM < mH/2

• H(125) only scalar we know, a portal to DM?

๏ Gluon fusion and VH

• Tag with ISR jet or a boson V(hh) or Z()

• Same final state as monoX searches

๏ Vector-boson fusion (VBF)

• Tag using forward jets (large ∆η)

• Low backgrounds (S/B ~ 0.5)

• Most sensitive signature

‣ 13TeV result from CMS BR < 28%(21% exp)

• Z(νν), W(ν) bkgs from control regions

• Shape fit to maximise sensitivity

‣ 8TeV result from ATLAS BR < 28%(31% exp)

• Still competitive, update soon!

!11Combined VBF-tag Z(ll)H-tag V(qq')H-tag ggH-tag

SM

σ inv.)

/→

x B

(H

σ95%

CL u

pper

limit o

n

0

0.2

0.4

0.6

0.8

1

1.2

1.4

Observed

Median expected

68% expected

95% expected

(13 TeV)-1

35.9 fb

CMS Preliminary

Combined limit: 0.24 (0.18)

H(125)

χ

χ

H(125) χ

χ

W/Z∗

H

χ

χ

W/ZggF

VBF

VH

CMS PAS-HIG-17-023ATLAS 1508.07869

CMS PAS-HIG-17-023

http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/HIG-17-023/index.html

https://inspirehep.net/record/1391149

http://cms-results.web.cern.ch/cms-results/public-results/preliminary-results/HIG-17-023/index.html

Mediator → SM

!12


0 500 1000 1500 2000 2500

0.0

0.5

1.0

1.5

2.0

2.5

MZ'B(GeV)

gB

UA2

CDF Run I

CDF 1.1 fb!1

CMS

0.13 fb!1

ATLAS 1 fb!1

CMS

4 fb!1

CMS 5 fb!1

CMS 20 fb!1

ATLAS

13 fb!1

L ∝gB

6Z 0

Bµqγµq

arXiv:1306.2629

Mediator searches

๏ New mediator can decay back to SM

๏ If mmed accessible at LHC could be

key to establish characteristics of

DM interaction

๏ Low sensitivity for light mmed due

to trigger pT thresholds

‣ Recently progress on this front:

1. Boosted dijets (ISR jet tag)

2. Data scouting (trigger-level jets)

!13

SM DM

SM DMmed

SM SM

SM SMmed

Martino Borsato - USCZ' mass (GeV)

50 100 200 300 1000

q'

couplin

g, g

0.02

0.03

0.04

0.1

0.2

0.3

0.4

1CMS

(13 TeV)-135.9 fb

95% CL upper limits

UA2 [13]

CDF Run 1 [18]

CDF Run 2 [19]

[24]-1ATLAS 8 TeV, 20.3 fb

[34]-1CMS 8 TeV, 18.8 fb

[35]-1CMS 13 TeV, 12.9 fb

Z Width (indirect) [71]

ObservedExpected 1 std. deviation±

2 std. deviation±

Mediator searches

Boosted dijets

๏ Require an ISR jet or γ to satisfy trigger threshold

๏ Boosted collimated dijet reconstructed as large-R jet

• Use jet substructure to separate

from single-jet background

๏ Example: CMS JHEP 01(2018)097

• Narrow ISR jet pT > 500 GeV

• Probing m(Z’) down to 50 GeV

• Background from single-jet control regions

(substructure variable uncorrelated from mass)

๏ Example: ATLAS arXiv:1801.08769

• Extending down to m(Z’) = 100 GeV

!14

Events

/ 5

GeV

0

5000

10000

15000

20000

25000Data 3)×W(qq)+jets (

Total SM pred. 3)×Z(qq)+jets (

Multijet pred. 3)×(qq)+jets (tt/t

=135 GeVZ'

=0.17, mq'

Z'(qq), g

(13 TeV)-1

35.9 fb

CMS

: 500-600 GeVT

p

(GeV)SDm50 100 150

Data

/Pre

dic

tion

0.9

1

1.1

JHEP 01(2018)097

JHEP 01(2018)097


Mediator searches

Data scouting

๏ Reduce trigger rates at “low" mass

• Online jet reconstruction

• Compact event format

๏ Example: ATLAS arXiv:1804.03496

• Construct jets in HLT from Calorimeter

• Only jets pi and quality to disk (0.5%)

• ET > 100 GeV (29/fb), ET > 75 GeV (3.6/fb)

• Searching down to m(Z’) = 450 GeV

๏ Example: CMS PAS-EXO-16-056

• Calorimeter scouting m > 0.5 TeV:

• Particle-Flow scouting m > 1.25 TeV:

!15 [GeV]Z’

m

400 600 800 1000 1200 1400 1600 1800 2000

qg

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

|y*| < 0.3 |y*| < 0.6

1− 3.6 fb 1− 29.3 fb

ATLAS

= 13 TeVs

95% CL upper limits

TLA Observed

)σ 1-2±TLA Expected (

Dijet Observed

Eve

nts

/ B

in

410

510

610

710

810

2−

02

[GeV]jjm500 600 700 800 9001000 2000

2−

02

Sig

nific

an

ce

ATLAS

, |y*| < 0.3-1Data, 3.6 fbBackground fitBumpHunter interval

x 500σZ’, = 0.1

q = 550 GeV, gZ’m

, |y*| < 0.6-1Data, 29.3 fbBackground fitBumpHunter interval

x 500σZ’, = 0.1

q = 750 GeV, gZ’m

-value = 0.6pBH

-value = 0.42p 2χ

-value = 0.44pBH

-value = 0.13p 2χ

arXiv:1804.03496

arXiv:1804.03496

Martino Borsato - USC.....

.....

.....

......

.....

.....

.....

......

.....

.....

.....

......

.....

.....

.....

......

.....

......

.....

.....

.

50 100 200 300 1000 2000

[GeV]Z'M

1−10

1

qg

'

5% = Z'M / Z'Γ

10% = Z'M / Z'Γ

30% = Z'M / Z'Γ

50% = Z'M / Z'Γ

100% = Z'M / Z'Γ

qq→Z'

95% CL exclusions

~100% < Z'M / Z'Γ[ATLAS-EXOT-2017-01]

ATLAS Boosted Dijet, 13 TeV

[EXO-16-046]

, 13 TeVχCMS Dijet

[ATLAS-EXOT-2016-21]

ATLAS Dijet, 13 TeV

~10% < Z'M / Z'Γ[ATLAS-CONF-2016-030]

ATLAS TLA, 13 TeV

[EXO-16-056]

CMS Dijet, 13 TeV

[ATLAS-CONF-2016-070]

, 13 TeVγATLAS Dijet+ISR

[EXO-14-005]

CMS Dijet, 8 TeV

[ATLAS-CONF-2016-070]

ATLAS Dijet+ISR j, 13 TeV

[EXO-16-057]

CMS Dijet b tagged, 8 TeV[Nucl. Phys. B 400, 3 (1993)]UA2

[EXO-17-001]

CMS Boosted Dijet, 13 TeV[Phys. Rev. D 55, 5263 (1997)]CDF Run1

[Phys. Rev. D 79, 112002 (2009)]CDF Run2

[arXiv:1404.3947]

)Z'

/MZ'

ΓZ width (all

CMS Preliminary

Limits on the universal coupling between a leptophobic boson and quarks [EXO- 6- ] from various dijet analyses from CMS,ATLAS, CDF, and UA . The limits are shown in solid lines, with the excluded area above the lines. The grey dashed lines show thevalues at fixed values of . Most of the analyses, with the exception of Dijet , assume that the intrinsic width is negligiblecompared to the experimental resolution and hence are valid for . The Dijet analysis is valid for

. Also shown is an indirect constraint on from the boson width, which is valid for all values of .

|

boosted dijet

b-tagged

8 TeV

Dijet X

Dijet

Dijet ATLAS

Dijet 8 TeV

boosted dijet

(ATLAS)

UA2

Summary of dijet searches

•Searched also Z’→

‣CMS PAS-EXO-16-031

‣ATLAS arXiv:1707.02424

!16

[PRL 117,031802(2016)]

[JHEP 1801(2018)097]

[arXiv:1802.06149]

[arXiv:1803.08030]

CMS TLA jets

ATLAS

ATLAS TLA, 13 TeV

[arXiv:1804.03496]


Mediator Mass [TeV]

0 0.5 1 1.5 2 2.5 3

DM

Mass [T

eV

]

0.2

0.4

0.6

0.8

1

1.2DM Simplified Model Exclusions Preliminary July 2017ATLAS

= 1DM

= 0, gl

= 0.25, gq

gAxial-vector mediator, Dirac DM

All limits at 95% CL

Pert

urb

ativ

e U

nita

rity

Dije

t

arXiv:1703.09127 [hep-ex]

-1 = 13 TeV, 37.0 fbs

Dijet

Dije

t 8 T

eV

Phys. Rev. D. 91 052007 (2015)

-1 = 8 TeV, 20.3 fbs

Dijet 8 TeVD

ijet T

LA

ATLAS-CONF-2016-030

-1 = 13 TeV, 3.4 fbs

Dijet TLA

Dije

t +

IS

R

ATLAS-CONF-2016-070

-1 = 13 TeV, 15.5 fbs

Dijet + ISR

γ+missTE

Eur. Phys. J. C 77 (2017) 393

-1 = 13 TeV, 36.1 fbs

γ+missTE

+jetmissTE

ATLAS-CONF-2017-060

-1 = 13 TeV, 36.1 fbs

+jetmissTE

+ZmissTE

ATLAS-CONF-2017-040

-1 = 13 TeV, 36.1 fbs

+ZmissTE

DM

Mas

s =

Med

iato

r Mas

s

×2

= 0

.12

2hcΩ

Therm

al R

elic

Mono-X vs mediator searches

!17

gq = 0.25, g = 0 arXiv:1708.09674


Mono-X vs mediator searches

!18

gq = 0.1, g = 0.01

Francesco Lo Sterzo Mediator Mass [TeV]

0 0.5 1 1.5 2 2.5 3

DM

Ma

ss [

Te

V]

0.2

0.4

0.6

0.8

1

1.2DM Simplified Model Exclusions Preliminary July 2017ATLAS

= 1DM

= 0.01, gl

= 0.1, gq

gVector mediator, Dirac DM

All limits at 95% CL

Dije

tDijet

Phys. Rev. D. 91 052007 (2015)

-1 = 8 TeV, 20.3 fbsDijet 8 TeV

arXiv:1703.09127 [hep-ex]

-1 = 13 TeV, 37.0 fbsDijet

ATLAS-CONF-2016-030

-1 = 13 TeV, 3.4 fbsDijet TLA

ATLAS-CONF-2016-070

-1 = 13 TeV, 15.5 fbsDijet + ISR

+XmissTE

+XmissTE

Eur. Phys. J. C 77 (2017) 393

-1 = 13 TeV, 36.1 fbs γ+

miss

TE

ATLAS-CONF-2017-060

-1 = 13 TeV, 36.1 fbs+jet

miss

TE

Dile

pto

n

CERN-EP-2017-119

-1 = 13 TeV, 36.1 fbs

Dilepton

DM

Mas

s =

Med

iato

r Mas

s

×2

= 0

.12

2hcΩ

Therm

al R

elic

arXiv:1708.09674

Lighter mediators → SM

!19


a

γ

γ

Dark Sectors at the LHC

๏ Address SM problems with light very-

weakly interacting states → Dark Sectors

‣ Can get also DM candidate (e.g. freeze-in)

๏ Dark sector portals:

• Scalar portal (φ)

• Vector portal (A’)

• Neutrino portal (N)

• Axion portal (a)

๏ Search at (low-energy) intensity frontier

• LHC can exploit huge cross-sections

• Main challenge: triggering

!20

portals

Recent review: 1608.08632

φ

h f

f

f

fA0

γ/Z

N ναsin θαN ν

https://arxiv.org/abs/1608.08632


The LHCb potential

๏ Designed to exploit the LHC

intensity frontier to do B physics

๏ Only LHC detector fully

instrumented in forward region

๏ ~10x lower luminosity (low pile-up)

๏ Excellent vertex and mass resolution

๏ Capable of very soft triggers:

• At hardware level (L0):

‣Muons with pT > 1.8 GeV

‣Calo deposits with ET > 3 GeV

• At Software level (HLT):

‣Triggers on detached vertices

!21

Int.J.Mod.Phys. A 30, 1530022 (2015)

LHCb

MS

Cherenkov

drift tube

pixel silicon strip ECAL

HCAL muon

CMS

LHCb 2<η<5

๏ “Trigger-less” upgrade (2021)• Read-out detector in real time• Can trigger on detached vertices,

precise particle ID and more

TDR: [LHCB-TDR-016]

http://cds.cern.ch/record/1701361?ln=en


๏ Look for new hidden-sector bosons

in b→s penguin transitions

๏ World record samples of B→K(*)µµ

• search for narrow µµ peak

๏ Allow detached µµ (within VELO)

• small SM mixing can give lifetime

๏ Constrain on light scalars

• mixing with SM Higgs

• world-best limits below 2mτ

• Complementary to Ship

!22

Dark Bosons from b→sPhys Rev Lett 115 161802 (2015)

Phys Rev D 95, 071101(R) (2017)

b

d

Vtb Vts

s

d

µ−

µ+

t

W+

χ

0 K

d/u d/u

B0(+)

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K∗(+)

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0.5 1.0 2.0 4.0

mϕ (GeV)

10−12

10−10

10−8

10−6

sin2θ

CODEX-bSHiP

MATHUSLA

CHARM

LHCb, 3 fb−1

LHCb, 300 fb−1

Plot from arXiv:1708.09395

B.Batell, M.Pospelov, A.Ritz, PRD 83, 054005 (2011)F.Bezrukov, D.Gorbunov, JHEP05(2010)010, JHEP07(2013)140

as τ ∝ 1=θ2.from Ref. [2].

as BðBþ→ K

þχÞ ∝ θ2,

fraction into muons is directly

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.161802

https://journals.aps.org/prd/abstract/10.1103/PhysRevD.95.071101


310

410

510

210

310

410

510

610

710

m(µµ) [MeV ]

Can

didates/σ[m

(µµ)]/2

LHCb√

s = 13TeVµ+µ−

µ±µ±

prompt-like sample

pT(µ) > 1GeV, p(µ) > 20GeV

Dark Photons at LHCb

!23

๏ Can search for Dark Photons (A') in µµ

‣ Can be very light, produced as γ*

‣ Large fraction in forward region, very soft pT

๏ Data scouting technique in LHCb Run 2:

‣ Online reconstruction and tight µ-ID

‣ Only interesting part of the event to disk → no pre-scale down to threshold 2 mµ

γ*/A'

γ*/A'

PRL 120 (2018) no.6, 061801

Prompt-like dimuon

sample with no pre-scale

down to threshold!

http://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-038.html

Martino Borsato - USC !24

2−10

1−10 1 10

12−10

11−10

10−10

9−10

8−10

7−10

6−10

5−10

4−10

m(A0) [ GeV ]

ε2

LHCb

LHCb

Previous Experiments

90% CL exclusion regions on [m(A0), ε2]

PRL 120 (2018) no.6, 061801


Already competitive below 1 GeV

LHCb


First limits above 10 GeV




๏ Proof of concept for soft µ searches at LHCb

• Multiple dimuons from dark cascade

• Heavy neutral leptons in displaced πµ

!25

2−10

1−10 1 10

12−10

11−10

10−10

9−10

8−10

7−10

6−10

5−10

4−10

m(A0) [ GeV ]

ε2

LHCb

LHCb


90% CL exclusion regions on [m(A0), ε2]

First limits above 10 GeV

PRL 120 (2018) no.6, 061801

Already competitive below 1 GeV

First non-beam-dump long lived A’ sensitivity LHCb


Other analysis filled the gap

A.Pierce et al. arXiv:1708.05389

Can recast to light scalar searches

Haisch et al. 1802.021566 8 10 12 14

m(φ) [GeV]

0

5

10

15

20

σ(gg→

φ)×B(

φ→

µµ)[pb]

Υ(1S)

Υ(2S)

Υ(3S)

LHCb√s = 8TeV

95% CL upper limits

Median expected

68% expected

95% expected

Observed

CMS expected

CMS observed

Today on the arXiv! 1805.09820


https://inspirehep.net/record/1616725


LHCb Upgrade Dark Photon Reach

!26

-

/ /

/

-

-

/ /

-

-

-

-

-

-

-

-

[ ]

≡

α

w-mass BSM searches, including dark photons (predictions assume 15/fb).

Inclusive A’ →μμ @ LHCb

Ilten, Soreq, Thaler, MW, Xue

[1603.08926]

Radiative Charm Decays @ LHCb

Ilten, Thaler, MW, Xue

[1509.06765]

See talk by W.Xue

on Tu evening

Inclusive A’→µµ at LHCbIlten, Soreq, Thaler, Williams, Xue [1603.08926]

Radiative D Decays at LHCbIlten, Thaler, Williams, Xue [1509.06765]

10

10

ε2

10

m(A0) [ GeV ]

Run 3 reach for dark photons

๏Using D*0 → D0A’(ee)

๏With upgraded trigger

expect 300⨉109 D*0 → D0γ

per fb-1 (15/fb in Run 3)


Conclusions

๏ Investigating the origin of Dark Matter is one of the main goals of the LHC program

๏ Different and often complementary searches:

• Mediator → DM (holistic)

‣ Mono-X searches

‣ Higgs to invisible searches

• Mediator → SM (peak search)

‣ Searching structure in dijet (dilepton) spectrum

‣ Data scouting and boosted jets to reach lower masses

• Lighter mediators → SM (dark sectors)

‣ LHCb recently demonstrated to be very sensitive

!27

BACKUP

!28


Theory uncertainties for mono-X

!29

Uncertainty source Process (magnitude) Correlation

Fact. & renorm. scales (QCD)Z → νν/W → `ν (0.1 – 0.5%)Z → νν/γ+jets (0.2 – 0.5%)

Correlated between processes;and in pT

pT shape dependence (QCD)Z → νν/W → `ν (0.4 – 0.1%)Z → νν/γ+jets (0.1 – 0.2%)


Process dependence (QCD)Z → νν/W → `ν (0.4 – 1.5%)Z → νν/γ+jets (1.5 – 3.0%)


Effects of unknown Sudakov logs (EW)Z → νν/W → `ν (0 – 0.5%)Z → νν/γ+jets (0.1 – 1.5%)


Missing NNLO effects (EW)Z → νν (0.2 – 3.0%)W → `ν (0.4 – 4.5%)γ+jets (0.1 – 1.0%)

Uncorrelated between processes;correlated in pT

Effects of NLL Sudakov approx. (EW)Z → νν (0.2 – 4.0%)W → `ν (0 – 1.0%)γ+jets (0.1 – 3.0%)

Uncorrelated between processes;correlated in pT

Unfactorized mixed QCD-EW correctionsZ → νν/W → `ν (0.15 – 0.3%)Z → νν/γ+jets (<0.1%)


PDFZ → νν/W → `ν (0 – 0.3%)Z → νν/γ+jets (0 – 0.6%)


CMS mono-X arXiv:1712.02345


HNL in B→π+µ−µ−

๏ Lepton number violating B−→π+µ−µ− can

proceed via on-shell Majorana neutrinos

๏ Look for B mass peak, then extract limit

as a function of mN

๏ Limit set on N(πµ) lifetimes up to 1000 ps

๏ Constraints on mixing angle Vµ4

• Recently revisited

๏ Also searched in charm D+→π−µ+µ+

!30

Neutrino mass [MeV]

1000 2000 3000 4000 5000

Upper

lim

it

-910

-810

-710

-610 1 ps

10 ps

100 ps

200 ps

500 ps

1000 ps

LHCb

W

+

+

u N

W

b

B

Can be displaced

Phys Rev Lett 112 131802 (2014)

B Shuve, ME Peskin, PRD94 (2016) no.11, 113007

PLB 724 (2013) 203-212B → ×

B(D+→ π−µ+µ+) < 2.2 (2.5)× 10−8,

B(D+s→ π−µ+µ+) < 1.2 (1.4)× 10−7.

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.131802


Future HNL at LHCb

๏ Inclusive search

๏ Can also search higher masses using

on-shell W−→jet µ−µ−

!31

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µ+

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µ+


π−

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PV (SV) TV

p<latexit sha1_base64="W/km4v70f5ZOHnM2DbTiziC6ch0=">AAAB53icdVA9SwNBEJ3zM8avaEqbxRCwOu4ugcQuYGOZgGcCyRH2NnvJmr0PdveEcKSzs7FQsfUv2dn5U9zkIqjog4HHezPMzPMTzqSyrHdjbX1jc2u7sFPc3ds/OCwdHV/LOBWEuiTmsej5WFLOIuoqpjjtJYLi0Oe0608vFn73lgrJ4uhKzRLqhXgcsYARrLTUSYalimU6dadZq6OcOI0VqdnINq0lKq1y9e4DANrD0ttgFJM0pJEiHEvZt61EeRkWihFO58VBKmmCyRSPaV/TCIdUetny0DmqamWEgljoihRaqt8nMhxKOQt93RliNZG/vYX4l9dPVdD0MhYlqaIRyRcFKUcqRouv0YgJShSfaYKJYPpWRCZYYKJ0NkUdwten6H/iOua5aXd0GE3IUYATOIUzsKEBLbiENrhAgMI9PMKTcWM8GM/GS966ZqxmyvADxusnJmyO2g==</latexit><latexit sha1_base64="f4iqZQHIoyzijSISsKvotJ5Kzp8=">AAAB53icdVDLSsNAFJ3UV62vapduBkvBVUjSQuuu4MZlC8YW2lAm00k7djIJMxOhhO7cuXGh4taf8QPc6Qf4BX6A06aCih64cDjnXu69x48ZlcqyXo3cyura+kZ+s7C1vbO7V9w/uJBRIjBxccQi0fWRJIxy4iqqGOnGgqDQZ6TjT07nfueKCEkjfq6mMfFCNOI0oBgpLbXjQbFsmU7NaVRrMCNOfUmqNrRNa4Fys1S5/nh+f2sNii/9YYSTkHCFGZKyZ1ux8lIkFMWMzAr9RJIY4QkakZ6mHIVEeuni0BmsaGUIg0jo4gou1O8TKQqlnIa+7gyRGsvf3lz8y+slKmh4KeVxogjH2aIgYVBFcP41HFJBsGJTTRAWVN8K8RgJhJXOpqBD+PoU/k9cxzwx7bYOowEy5MEhOALHwAZ10ARnoAVcgAEBN+AO3BuXxq3xYDxmrTljOVMCP2A8fQKdz5F0</latexit><latexit sha1_base64="f4iqZQHIoyzijSISsKvotJ5Kzp8=">AAAB53icdVDLSsNAFJ3UV62vapduBkvBVUjSQuuu4MZlC8YW2lAm00k7djIJMxOhhO7cuXGh4taf8QPc6Qf4BX6A06aCih64cDjnXu69x48ZlcqyXo3cyura+kZ+s7C1vbO7V9w/uJBRIjBxccQi0fWRJIxy4iqqGOnGgqDQZ6TjT07nfueKCEkjfq6mMfFCNOI0oBgpLbXjQbFsmU7NaVRrMCNOfUmqNrRNa4Fys1S5/nh+f2sNii/9YYSTkHCFGZKyZ1ux8lIkFMWMzAr9RJIY4QkakZ6mHIVEeuni0BmsaGUIg0jo4gou1O8TKQqlnIa+7gyRGsvf3lz8y+slKmh4KeVxogjH2aIgYVBFcP41HFJBsGJTTRAWVN8K8RgJhJXOpqBD+PoU/k9cxzwx7bYOowEy5MEhOALHwAZ10ARnoAVcgAEBN+AO3BuXxq3xYDxmrTljOVMCP2A8fQKdz5F0</latexit><latexit sha1_base64="wS1jWt03+ojTamNFPbJOjzGtn8c=">AAAB53icdVBNS8NAEJ34WetX1aOXxSJ4CklaaL0VvHhswdhCG8pmu2nXbjZhdyOU0F/gxYOKV/+SN/+N2zaCij4YeLw3w8y8MOVMacf5sNbWNza3tks75d29/YPDytHxrUoySahPEp7IXogV5UxQXzPNaS+VFMchp91werXwu/dUKpaIGz1LaRDjsWARI1gbqZMOK1XH9upes1ZHK+I1ClJzkWs7S1ShQHtYeR+MEpLFVGjCsVJ910l1kGOpGeF0Xh5kiqaYTPGY9g0VOKYqyJeHztG5UUYoSqQpodFS/T6R41ipWRyazhjrifrtLcS/vH6mo2aQM5FmmgqyWhRlHOkELb5GIyYp0XxmCCaSmVsRmWCJiTbZlE0IX5+i/4nv2Ze223GqrWaRRglO4QwuwIUGtOAa2uADAQoP8ATP1p31aL1Yr6vWNauYOYEfsN4+AaZ0jP4=</latexit>


N2<latexit sha1_base64="zFpMC0YgcmGD5gIEbU4ALIW6DqQ=">AAAB6XicdVBNS8NAEJ3Ur1q/qoIXL4tF8BSStNB6K3rxJC1aW2hD3Ww37dLNB7sboYT+BC8eVLz6j7x58be4bSqo6IOBx3szzMzzYs6ksqx3I7e0vLK6ll8vbGxube8Ud/duZJQIQlsk4pHoeFhSzkLaUkxx2okFxYHHadsbn8/89h0VkkXhtZrE1A3wMGQ+I1hp6eqy7/SLJct0Kk6tXEEZcaoLUraRbVpzlOoHzY9bAGj0i2+9QUSSgIaKcCxl17Zi5aZYKEY4nRZ6iaQxJmM8pF1NQxxQ6abzU6foWCsD5EdCV6jQXP0+keJAykng6c4Aq5H87c3Ev7xuovyam7IwThQNSbbITzhSEZr9jQZMUKL4RBNMBNO3IjLCAhOl0ynoEL4+Rf+TlmOemnZTh3EGGfJwCEdwAjZUoQ4X0IAWEBjCPTzCk8GNB+PZeMlac8ZiZh9+wHj9BCjXj3A=</latexit><latexit sha1_base64="5yIK94qaiELvoSmHoC5hazs8Wls=">AAAB6XicdVDLSsNAFJ3UV62vquDGzWARXIUkLbTuSt24khaNLbShTKaTduhkEmYmQgn9BDcuVNy69i/8Andu/BanTQUVPXDhcM693HuPHzMqlWW9G7ml5ZXVtfx6YWNza3unuLt3LaNEYOLiiEWi4yNJGOXEVVQx0okFQaHPSNsfn8389g0Rkkb8Sk1i4oVoyGlAMVJaurzoO/1iyTKdilMrV2BGnOqClG1om9YcpfpB64O+NF6b/eJbbxDhJCRcYYak7NpWrLwUCUUxI9NCL5EkRniMhqSrKUchkV46P3UKj7UygEEkdHEF5+r3iRSFUk5CX3eGSI3kb28m/uV1ExXUvJTyOFGE42xRkDCoIjj7Gw6oIFixiSYIC6pvhXiEBMJKp1PQIXx9Cv8nrmOemnZLh9EAGfLgEByBE2CDKqiDc9AELsBgCG7BPXgwmHFnPBpPWWvOWMzsgx8wnj8BeFyRLA==</latexit><latexit sha1_base64="5yIK94qaiELvoSmHoC5hazs8Wls=">AAAB6XicdVDLSsNAFJ3UV62vquDGzWARXIUkLbTuSt24khaNLbShTKaTduhkEmYmQgn9BDcuVNy69i/8Andu/BanTQUVPXDhcM693HuPHzMqlWW9G7ml5ZXVtfx6YWNza3unuLt3LaNEYOLiiEWi4yNJGOXEVVQx0okFQaHPSNsfn8389g0Rkkb8Sk1i4oVoyGlAMVJaurzoO/1iyTKdilMrV2BGnOqClG1om9YcpfpB64O+NF6b/eJbbxDhJCRcYYak7NpWrLwUCUUxI9NCL5EkRniMhqSrKUchkV46P3UKj7UygEEkdHEF5+r3iRSFUk5CX3eGSI3kb28m/uV1ExXUvJTyOFGE42xRkDCoIjj7Gw6oIFixiSYIC6pvhXiEBMJKp1PQIXx9Cv8nrmOemnZLh9EAGfLgEByBE2CDKqiDc9AELsBgCG7BPXgwmHFnPBpPWWvOWMzsgx8wnj8BeFyRLA==</latexit><latexit sha1_base64="47xBygJwTP031YuHu3KBa/IPs2o=">AAAB6XicdVBNS8NAEJ3Ur1q/qh69LBbBU0jSQuut6MWTVDS20Iay2W7apZtN2N0IpfQnePGg4tV/5M1/47aNoKIPBh7vzTAzL0w5U9pxPqzCyura+kZxs7S1vbO7V94/uFNJJgn1ScIT2QmxopwJ6mumOe2kkuI45LQdji/mfvueSsUScasnKQ1iPBQsYgRrI91c9b1+ueLYXs1rVGtoSbx6Tqoucm1ngQrkaPXL771BQrKYCk04VqrrOqkOplhqRjidlXqZoikmYzykXUMFjqkKpotTZ+jEKAMUJdKU0Gihfp+Y4lipSRyazhjrkfrtzcW/vG6mo0YwZSLNNBVkuSjKONIJmv+NBkxSovnEEEwkM7ciMsISE23SKZkQvj5F/xPfs89s99qpNM/zNIpwBMdwCi7UoQmX0AIfCAzhAZ7g2eLWo/VivS5bC1Y+cwg/YL19ApwVjYs=</latexit>

µ+




PV

µ+


SVjet

<latexit sha1_base64="Dei97lZYwkWVZ0J9IMTgOImrZgk=">AAAB7nicdVBNS8NAEJ34WetXtUcvi6XgKSRpofVW8OKxgrWFNpTNdtOu3Xy4uxFK6M1f4MWDild/jzdv/hQ3TQUVfTDweG+GmXlezJlUlvVurKyurW9sFraK2zu7e/ulg8MrGSWC0A6JeCR6HpaUs5B2FFOc9mJBceBx2vWmZ5nfvaVCsii8VLOYugEeh8xnBCst9QYiQNdUFYelimU6dadZq6OcOI0lqdnINq0FKq1y9e4DANrD0ttgFJEkoKEiHEvZt61YuSkWihFO58VBImmMyRSPaV/TEAdUuuni3jmqamWE/EjoChVaqN8nUhxIOQs83RlgNZG/vUz8y+snym+6KQvjRNGQ5Iv8hCMVoex5NGKCEsVnmmAimL4VkQkWmCgdURbC16fof9JxzFPTvtBhNCFHAY7gGE7Ahga04Bza0AECHO7hEZ6MG+PBeDZe8tYVYzlThh8wXj8BjfyRWA==</latexit><latexit sha1_base64="TsAfS0yt8gvSF5uR1mGbF3jPdC4=">AAAB7nicdVDLSsNAFJ3UV62vapduBkvBVUjSQuuu4MZlBWMLbSiT6aQdO5PEmYlQQnd+gRsXKm79Ej/AnX6AX+AHOG0qqOiBC4dz7uXee/yYUaks69XILS2vrK7l1wsbm1vbO8XdvXMZJQITF0csEh0fScJoSFxFFSOdWBDEfUba/vh45reviJA0Cs/UJCYeR8OQBhQjpaVOT3B4QVShXyxbplNzGtUazIhTX5CqDW3TmqPcLFWuP57f31r94ktvEOGEk1BhhqTs2lasvBQJRTEj00IvkSRGeIyGpKtpiDiRXjq/dworWhnAIBK6QgXn6veJFHEpJ9zXnRypkfztzcS/vG6igoaX0jBOFAlxtihIGFQRnD0PB1QQrNhEE4QF1bdCPEICYaUjmoXw9Sn8n7iOeWTapzqMBsiQB/vgABwCG9RBE5yAFnABBgzcgDtwb1wat8aD8Zi15ozFTAn8gPH0CQVuk/I=</latexit><latexit sha1_base64="TsAfS0yt8gvSF5uR1mGbF3jPdC4=">AAAB7nicdVDLSsNAFJ3UV62vapduBkvBVUjSQuuu4MZlBWMLbSiT6aQdO5PEmYlQQnd+gRsXKm79Ej/AnX6AX+AHOG0qqOiBC4dz7uXee/yYUaks69XILS2vrK7l1wsbm1vbO8XdvXMZJQITF0csEh0fScJoSFxFFSOdWBDEfUba/vh45reviJA0Cs/UJCYeR8OQBhQjpaVOT3B4QVShXyxbplNzGtUazIhTX5CqDW3TmqPcLFWuP57f31r94ktvEOGEk1BhhqTs2lasvBQJRTEj00IvkSRGeIyGpKtpiDiRXjq/dworWhnAIBK6QgXn6veJFHEpJ9zXnRypkfztzcS/vG6igoaX0jBOFAlxtihIGFQRnD0PB1QQrNhEE4QF1bdCPEICYaUjmoXw9Sn8n7iOeWTapzqMBsiQB/vgABwCG9RBE5yAFnABBgzcgDtwb1wat8aD8Zi15ozFTAn8gPH0CQVuk/I=</latexit><latexit sha1_base64="XcUGiKFXg2RI7Dllusu/L6PJJAI=">AAAB7nicdVBNS8NAEJ34WetX1aOXxSJ4CklaaL0VvHisYGyhDWWz3bRrN5u4uxFK6J/w4kHFq7/Hm//GbRtBRR8MPN6bYWZemHKmtON8WCura+sbm6Wt8vbO7t5+5eDwRiWZJNQnCU9kN8SKciaor5nmtJtKiuOQ0044uZj7nXsqFUvEtZ6mNIjxSLCIEayN1O3LGN1SXR5Uqo7t1b1mrY6WxGsUpOYi13YWqEKB9qDy3h8mJIup0IRjpXquk+ogx1Izwums3M8UTTGZ4BHtGSpwTFWQL+6doVOjDFGUSFNCo4X6fSLHsVLTODSdMdZj9dubi395vUxHzSBnIs00FWS5KMo40gmaP4+GTFKi+dQQTCQztyIyxhITbSKah/D1Kfqf+J59brtXTrXVLNIowTGcwBm40IAWXEIbfCDA4QGe4Nm6sx6tF+t12bpiFTNH8APW2ycOE498</latexit>

W+

<latexit sha1_base64="khczDvfVNWcrZYn/Bf6NagnUTCg=">AAAB6XicdZDLSsNAFIZP6q3WW9Wlm8EiCEJI2kLryoIbl/USW2hjmUwn7dDJhZmJUEIfwY0LFbe+hCsfwp1v47SpoKI/DHz8/znMOceLOZPKsj6M3MLi0vJKfrWwtr6xuVXc3rmWUSIIdUjEI9H2sKSchdRRTHHajgXFgcdpyxudTvPWLRWSReGVGsfUDfAgZD4jWGnrsnVz1CuWLLNcLdcrVZRBuTaHio1s05qpdPL2egFazV7xvduPSBLQUBGOpezYVqzcFAvFCKeTQjeRNMZkhAe0ozHEAZVuOht1gg6000d+JPQLFZq53ztSHEg5DjxdGWA1lL+zqflX1kmUX3dTFsaJoiHJPvITjlSEpnujPhOUKD7WgIlgelZEhlhgovR1CvoIX5ui/8Epm8emfW6VGnXIlIc92IdDsKEGDTiDJjhAYAB38ACPBjfujSfjOSvNGfOeXfgh4+UTVy2PiQ==</latexit><latexit sha1_base64="fCUL13KFWtJ44Ve5Lc9se2669nI=">AAAB6XicdZDNSsNAFIUn9a/Wv6pLQQaLIAghSQutKwtuXLZobKGNZTKdtEMnkzAzEUrp0qUbFypufYmufAh3PoMv4bSpoKIHBj7OuZe59/oxo1JZ1ruRWVhcWl7JrubW1jc2t/LbO1cySgQmLo5YJJo+koRRTlxFFSPNWBAU+ow0/MHZNG/cECFpxC/VMCZeiHqcBhQjpa2LxvVxJ1+wTKfkVIolmIJTnkPRhrZpzVQ4fZ3UP273J7VO/q3djXASEq4wQ1K2bCtW3ggJRTEj41w7kSRGeIB6pKWRo5BIbzQbdQwPtdOFQST04wrO3O8dIxRKOQx9XRki1Ze/s6n5V9ZKVFDxRpTHiSIcpx8FCYMqgtO9YZcKghUbakBYUD0rxH0kEFb6Ojl9hK9N4f/gOuaJadetQrUCUmXBHjgAR8AGZVAF56AGXIBBD9yBB/BoMOPeeDKe09KMMe/ZBT9kvHwCXuORzg==</latexit><latexit sha1_base64="fCUL13KFWtJ44Ve5Lc9se2669nI=">AAAB6XicdZDNSsNAFIUn9a/Wv6pLQQaLIAghSQutKwtuXLZobKGNZTKdtEMnkzAzEUrp0qUbFypufYmufAh3PoMv4bSpoKIHBj7OuZe59/oxo1JZ1ruRWVhcWl7JrubW1jc2t/LbO1cySgQmLo5YJJo+koRRTlxFFSPNWBAU+ow0/MHZNG/cECFpxC/VMCZeiHqcBhQjpa2LxvVxJ1+wTKfkVIolmIJTnkPRhrZpzVQ4fZ3UP273J7VO/q3djXASEq4wQ1K2bCtW3ggJRTEj41w7kSRGeIB6pKWRo5BIbzQbdQwPtdOFQST04wrO3O8dIxRKOQx9XRki1Ze/s6n5V9ZKVFDxRpTHiSIcpx8FCYMqgtO9YZcKghUbakBYUD0rxH0kEFb6Ojl9hK9N4f/gOuaJadetQrUCUmXBHjgAR8AGZVAF56AGXIBBD9yBB/BoMOPeeDKe09KMMe/ZBT9kvHwCXuORzg==</latexit><latexit sha1_base64="fpbWSJIMcQ28FtNOPZUs1HQsS+0=">AAAB6XicdVBNS8NAEJ3Ur1q/qh69LBZBEEKSFlpvBS8eKxpbaGPZbDft0s0m7G6EUvoTvHhQ8eo/8ua/cdtGUNEHA4/3ZpiZF6acKe04H1ZhZXVtfaO4Wdra3tndK+8f3Kokk4T6JOGJ7IRYUc4E9TXTnHZSSXEcctoOxxdzv31PpWKJuNGTlAYxHgoWMYK1ka7bd2f9csWxvZrXqNbQknj1nFRd5NrOAhXI0eqX33uDhGQxFZpwrFTXdVIdTLHUjHA6K/UyRVNMxnhIu4YKHFMVTBenztCJUQYoSqQpodFC/T4xxbFSkzg0nTHWI/Xbm4t/ed1MR41gykSaaSrIclGUcaQTNP8bDZikRPOJIZhIZm5FZIQlJtqkUzIhfH2K/ie+Z5/b7pVTaTbyNIpwBMdwCi7UoQmX0AIfCAzhAZ7g2eLWo/VivS5bC1Y+cwg/YL19ApqnjYI=</latexit>

b → Xµ+µ+π−

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0.1 1 10 10010-12

10-10

10-8

10-6

10-4

0.01

1

MN HGeVL

VmN

2

BBN Seesaw

KÆmn

E949

NuTeV

DELPHI

L3

CMS

ATLAS

LHC14

SHiPFCC-ee

CHARM

FMMF

EWPD

PS191

BEBC

NA3

KÆmmp

LHCb

Belle

LBNE

arXiv:1502.06541

B(b → Xµ+ν)

B(B+ → µ+ν)> 105

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u/c

W−

N

µ− µ−

π+

W−

W+

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(DM) (SM) (mediator)...Martino Borsato - USC DM signals!3 SM DM SM DM Direct detection Detect...

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