CODEX-: opening the book for CODEX-b€¦ · CODEX-b Production data taking • signiﬁcant...

CODEX-β: opening the book for CODEX-b

Philip Ilten

May 25, 2020

C O D E X – b

7th LLP Workshop

Ilten CODEX-b 1 / 25

Introduction

Expression of Interest arXiv:1911.00481 [hep-ex]

• A Compact Detector for Exotics at LHCb• letter of interest released last November, arXiv:1911.00481 [hep-ex]• letter of intent submitted• collaboration growing: 28 contributors and 16 institutes


https://arxiv.org/abs/1911.00481


Introduction

CODEX-b in a Nutshell

x

ϕ

SM

SM

CODEX-b box

UXA shield

shield veto

IP8Pb shield

DELPHI


Introduction

Zooming In


Introduction

A Picture is Worth . . .

cτ

mLLP

←lighter(.10MeV)

heavier(&10GeV)→

←near ∼m far→

Forward(FASER, SHiP,NA62, . . . )

Transvers

e

(CODEX-b,

MATHUSLA, AL3X, . . . )

LHC coverage(ATLAS, CMS, LHCb)

SCHEMATIC


Introduction

A Picture is Worth . . .

√s

mLLP

←lighter(.10MeV)

heavier(&10GeV)→

← lighter ∼ cc, bb, ττ h, t heavier →

LHC coverage(ATLAS, CMS, LHCb)

Forward(FASER, SHiP,

NA62, . . . )

Transverse(CODEX-b,

MATHUSLA, AL3X, . . . )

SCHEMATIC


Introduction

Why CODEX-b?

1 we need a transverse detector at the LHC2 probes a wide range of LLP models; complementary or

competitive with existing/proposed detectors3 accessible zero background location with necessary services,

DELPHI/UXA cavern4 integration with LHCb trigger-less readout5 compact size and modest cost with ability to extend


Introduction

Timing is Key (pre COVID-19)

2020 2021 2022 2023 2024 2025 2026

LS 2 Run 3 LS 3

CODEX-β Production Install data taking Removal

CODEX-b ProductionPartial Install

2027 2028 2029 2030 2031 2032 2033

Run 4 LS 4 Run 5

CODEX-b Productiondata taking

Remaining Install data taking

• significant progress has been made• priority is finalising CODEX-β design and plans• Birmingham (James Glover) working on technical drawings• more detailed design informed from CODEX-β


Reach

Reach


Reach

Model Overview

Vector (A′) hA′A′ F ′F

F ′F yes no reach

Scalar (S) SH†H S2H†H

SH†H yes yes

HNL (N) HLN

HLN yes

ALP (a) ∂µaqγµγ5q aGG aFF a(WW−BB)

yes yes pending pending

Production portalDecay portalUV operator


Reach

Dark Photon

• no sensitivity to inclusive production from EM currents• sensitive to production from H → A′A′ decays

10−5

10−4

10−3

10−2

10−1

10−1 101 103

Br[ℎ

→𝐴

′ 𝐴′ ]

𝑐𝜏 [m]

𝑚𝐴′ = 0.5 GeV

ATLAS 2DVCODEX-bAL3X (100 fb−1)MATHUSLA(200)

10−1 101 103 105

𝑐𝜏 [m]

𝑚𝐴′ = 10 GeV

ATLAS 1DVATLAS 2DVCODEX-b


Reach

Higgs Portalλ = 1.6 × 10−3

0.5 1.0 2.0 5.0

mS (GeV)

10−14

10−12

10−10

10−8

10−6si

n2θ

CODEX-b

300 fb−1

10 fb−1

NA62

CHARM

LHCb, 3 fb−1

LHCb, 300 fb−1

FASER2

SHiP

MATHUSLA

AL3X


Reach

Gluon Coupled ALPs

CODEX-b, 300/fb

CHARM

Excl. 1811.03474

FASER2, 3/ab

REDTop, 1017pot

CODEX-b w/calo

MATHUSLA200, 3/ab,

ϵfloor=10-5

0.05 0.10 0.50 1 5 1010-7

10-6

10-5

10-4

10-3

10-2

10-1

100

10-9

10-8

10-7

10-6

10-5

10-4

10-3

mA[GeV]

c G

1/f PBC[GeV

-1]

ALP w/ gluon couplings, Λ=1TeV


Reach

Heavy Neutral Leptons

10−10

10−8

10−6

10−4

10−2

0.2 1 10

|𝑈𝜏𝑁

|2

𝑚𝑁 [GeV]

NA62B factorySHiPMATHUSLA(200)FASER2CODEX-b


Building CODEX-b

Building CODEX-b


Building CODEX-b

Shielding

Lpre-veto

Lpost-veto

‘downstream’ stopp

ed-parent seco

ndary

rejectedby shield veto

µ

K0, n, . . .

µK0, n, . . .‘upstream’ stopped-parent secondarysuppressed by passive shield

CODEX-b UXA wall

shield veto

IP8Pb shield


Building CODEX-b

Background Simulation

1

10−2

102

104

19 21 23 25 27

BG

Flux

/300

fb−

1

𝐿shield [𝜆Pb]

Type; 𝜀veto𝑛; 10−2

𝑛; 10−3

𝑛; 10−4

𝑛; 10−5

15 + 415 + 5

15 + 6

17 + 4 17 + 5 17 + 6

19 + 4 19 + 5 19 + 6

20 + 420 + 5

20 + 6

𝐾0𝐿; 10−2

𝐾0𝐿; 10−3

𝐾0𝐿; 10−4

𝐾0𝐿; 10−5


Building CODEX-b

Background Measurement

0º (1) to beam line

0º (2) and 90º (3) to beam line

0º (4) to beam line

0º (5) and 45º (6) to beam line

Beam line

1

2,3

4

5,6

D3 platform


Building CODEX-b

Background Measurement

• 0.2 Hz hit rate at point 2 indicates Geant4 prediction of 10 Hz isconservative


Building CODEX-b

CODEX-β

• 2× 2× 2 m3 with central layer, each layer with triplet of RPCs• each layer made of 2× 1 m2 RPC block, 42 such layers• expected hardware cost of 150k EUR

1 Demonstrate the ability to detect and reconstruct charged particleswhich penetrate into the DELPHI cavern as well as the decayproducts of neutral particles decaying within the DELPHI cavern.

2 Detect and reconstruct a reasonable rate of neutral particlesdecaying inside the hermetic detector volume.

3 Show that CODEX-b can be integrated into the LHCb DAQ anddemonstrate an ability to give a trigger to LHCb to retain an eventthat looks interesting in CODEX-b.


Building CODEX-b

Triplet Support


Building CODEX-b

Outside Support

1951 mm

1892

mm


Building CODEX-b

Full Structure


Outlook

Outlook


Outlook

Some Thoughts

• forward/beam-dump experiments give us light LLPs withmedium/long lifetimes and low

√s

• LHC detectors give us heavy LLPs with long lifetimes• transverse detectors give us light LLPs with long lifetimes and

high√s

• we need a transverse detector at LHC

• CODEX-b covers does not have world-leading reach . . .• covers significant portions of parameter space• low cost in comparison to other proposals

• clear path forward for building CODEX-b• first steps taken, CODEX-β plans underway

Looking for new collaborators!Ilten CODEX-b 25 / 25

Backups

Backups


Backups

Widening the Net arXiv:1707.04591 [hep-ph]

SIMPs/ELDERS

UltralightDarkMa5er

Muong-2

Small-ScaleStructure

Microlensing

DarkSectorCandidates,Anomalies,andSearchTechniques

HiddenSectorDarkMa5er

SmallExperiments:CoherentFieldSearches,DirectDetecIon,NuclearandAtomicPhysics,Accelerators

GeV TeVkeVeVneVfeVzeV MeVaeV peV µeV meV PeV 30M☉

WIMPsQCDAxion

≈

GeV TeVkeVeVneVfeVzeV MeVaeV peV µeV meV PeV 30M☉

≈

Beryllium-8

BlackHoles

HiddenThermalRelics/WIMPlessDM

AsymmetricDM

Freeze-InDM

Pre-InflaIonaryAxion

Post-InflaIonaryAxion



Backups

Simultaneous Searches

displaced prompt

target

shield detector

beam

detector

beam

• sensitive to long lifetimes• EM background free• difficult to normalise

• sensitive to shorterlifetimes

• bump hunt on large EMbackground

• normalised from sidebands

• do both simultaneously for best of both worlds


Backups

Parameter Space JHEP 06 (2018)

10−2 10−1 100 101

mA′ [GeV]

10−6

10−5

10−4

10−3

10−2

ε

prompt

displaced

outside detector

50 fs

1500 fs

100000 fs



Backups

LHCb Trigger LHCb, JINST 8 (2013)

detector

hardware

software disk

Run�2Run�3

5�TB/s O(10)�GB/s

0.7�GB/s

50�GB/s1�TB/s

• real-time calibration and full event reconstruction in Run 2• inclusive dimuon from threshold and jet triggers in Run 2• full detector readout in Run 3


http://arxiv.org/abs/1211.3055

Backups

Higgs Portal

λ = 0 λ = 1.6 × 10−3

0.5 1.0 2.0 4.0

mS (GeV)

10−14

10−12

10−10

10−8

10−6

sin

2θ

10 fb−1

CODEX-b

300 fb−1

NA62

SHiP

MATHUSLA

FASER 2

CHARM

LHCb, 3 fb−1

LHCb, 300 fb−1

AL3X

0.5 1.0 2.0 5.0

mS (GeV)

10−14

10−12

10−10

10−8

10−6

sin

2θ

CODEX-b

300 fb−1

10 fb−1

NA62

CHARM

LHCb, 3 fb−1

LHCb, 300 fb−1

FASER2

SHiP

MATHUSLA

AL3X

b

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Backups

Fermion Coupled ALPs

CODEX-b, 300/fb

LHCb, B→Kμμ

LHCb, B→K*μμ

CHARM

REDTop, 1017 pot

E949

FASER2, 3/ab

KLEVER, 5·1019pot

MATHUSLA200, 3/ab w/ ϵfloor=10-5

0.05 0.10 0.50 1 5 1010-7

10-6

10-5

10-4

10-3

10-2

10-1

100

10-7

10-6

10-5

10-4

10-3

10-2

10-1

mA[GeV]

c f g Y

ALP w/ universal fermion couplings, Λ=1TeV


Backups


10−10

10−8

10−6

10−4

10−2

0.2 1 10

|𝑈𝑒𝑁

|2

𝑚𝑁 [GeV]

NA62DUNESHiPMATHUSLA(200)FASER2CODEX-b


Backups


10−10

10−8

10−6

10−4

10−2

0.2 1 10

|𝑈𝜇

𝑁|2

𝑚𝑁 [GeV]

NA62DUNESHiPMATHUSLA(200)FASER2CODEX-b


Backups

R-parity Violating Supersymmetry

• study from Dercks, Vries, Dreiner, and Wang in PRD 99 055039(2019)

benchmark coupling production decay products1 λ′122, λ

′112 D±s → χ0

1 + e± η, η′, φ,K0,± + νe, e∓

4 λ′131, λ′121 B0,± → χ0

1 +X0,± D±, D∗± + e∓




Backups

R-parity Violating Supersymmetry

• study from Helo, Hirsch, and Wang in JHEP 07 056 (2018)

2 5 10 200.1 0.2 0.5 1 5010

-4

10-3

10-2

10-1

1

101

102

103

104

105

106

107

mχ10 [GeV]

cτ[m

]

Br(Z→2χ1

0)=10-5

MATHUSLA

CODEX-b

FASERR

2 5 10 200.1 0.2 0.5 1 5010

-4

10-3

10-2

10-1

1

101

102

103

104

105

106

107

mχ10 [GeV]

cτ[m

]

Br(Z→2χ1

0)=10-3

MATHUSLA

CODEX-b

FASERR



Backups

Neutral Naturalness

• consider fraternal twin Higgs model and search for glueball

0 5 10 15 20 25

600

800

1000

1200

1400

1600

1800

2000

m0 (GeV)

mT(GeV

)CODEX-b

MATHUSLA

ATLAS 1DV

ATLAS 2DV

LHCb

substruct.h→invisible


Backups

Dark Matter Models

• a number of models considered including inelastic, co-scattering,co-annihilation, etc.

105 4020

10-4

10-3

10-2

mχ1(GeV)

Sin

θ

mZD = 0.6 mχ1

ϵ = 10-3

α = 1α = 4π

CODEX-b (α=4π)

CODEX-b (α=1)

MATHUSLA (α=4π)

MATHUSLA (α=1)

Coannihilation(α=1)

Coannihilation(α=4π

)


Backups

Backgrounds

• 1014 neutrons and K0L per 300 fb−1

• this requires 32λ of shielding• 7λ from UXA wall, 25λ from lead shield• expect ≈ 109 muons per 300 fb−1 which can produce secondaries• 103 K0

L per 300 fb−1 pass through the shield• need active layer in shield for vetoing• update of previous studies with detailed Geant4 study


CODEX-: opening the book for CODEX-b€¦ · CODEX-b Production data taking • signiﬁcant...

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Transcript of CODEX-: opening the book for CODEX-b€¦ · CODEX-b Production data taking • signiﬁcant...