Mo r e f u n w i t h j e t s Mo r e f u n w i t - - PowerPoint PPT Presentation

SLIDE 1

Doktoranddag June 19, 2018 Eva Hansen 1

Mo r e f u n w i t h j e t s Mo r e f u n w i t h j e t s

E v a B r

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tu m a n n H a n s e n E v a B r

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tu m a n n H a n s e n D

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a n d d a g D

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a n d d a g 1 9 . J u n e 2 1 8 1 9 . J u n e 2 1 8

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Doktoranddag June 19, 2018 Eva Hansen 2

Quick overview

• 1

. 7 5 y e a r s i n t

• m

y P h D

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a i n t h e m e : D a r k m a tu e r s e a r c h e s w i t h j e t fj n a l s t a t e s i n A T L A S

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i n c e l a s t D

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a y : M

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m a n c e a n d u p g r a d e w

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k

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r

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~ n

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: M

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t l y a n a l y s i s a n d u p g r a d e w

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k ( H

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e f u l l y )

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Doktoranddag June 19, 2018 Eva Hansen 3

In-situ combination - 1

γ + j e t M u l t i

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e t γ Z + j e t Z

• I

n

• s

i t u m e t h

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s a r e u s e d t

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s t r a i n d i s c r e p a n c i e s i n j e t r e s p

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s e b e t w e e n d a t a a n d M C

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E S : p T b a l a n c e

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j e t a g a i n s t a w e l l c a l i b r a t e d

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j e c t

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M S : T r a c k j e t s a n d t

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/ W e v e n t s

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n l y d

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e f

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l a r g e

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j e t s

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y j

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: C

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b i n e t h e m e a s u r e m e n t s t

• c
• v

e r m

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e p h a s e s p a c e

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u r r e n t l y w

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k i n g

• n

a p a p e r

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l a r g e

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i n

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i t u c a l i b r a t i

• n
• L

a t e s t a n d g r e a t e s t r e c

• m

m e n d a t i

• n

s f

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s m a l l

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j e t s s c h e d u l e d t

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e c

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p l e t e d t h i s s u m m e r

Performance

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Doktoranddag June 19, 2018 Eva Hansen 4

In-situ combination - 2

• We

h a v e s e e n t h a t h i g h

• s

t a t i s t i c s m a k e s a n a l y s e s s e n s i t i v e t

• s

t r u c t u r e s i n t h e j e t c a l i b r a t i

• n
• A

n a l t e r n a t i v e c

• m

b i n a t i

• n

p r

• c

e d u r e w a s d e v e l

• p

e d a n d u s e d f

• r

t h e D i j e t t r i g g e r l e v e l a n a l y s i s w h i c h e n s u r e s a s m

• t

h c a l i b r a t i

• n

c u r v e

• C
• m

b i n a t i

• n

p r

• c

e d u r e b a s e d

• n

a p

• l

y n

• m

i a l fj t i n s t e a d

• f

i n t e r p

• l

a t i n g s p l i n e s

Performance

SLIDE 5

Doktoranddag June 19, 2018 Eva Hansen 5

General Feature Extractor (gFEX) - 1

• Module the phase-1 upgrade of the Level 1

Calorimeter Trigger

• Entire η (and φ) range available in one

module

• Enables identification of large radius jets

and substructure in real time → Capture Lorentz boosted W/Z/Higgs/top → TLA with boosted object

• Other global event variables:
• Missing transverse energy
• Centrality in heavy ion collision
• Event-by-event pile-up energy density

→ Local pileup suppression using baseline subtraction techniques

Upgrade

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Doktoranddag June 19, 2018 Eva Hansen 6

General Feature Extractor (gFEX) - 2

• My job: Control Software
• Prepare for run, configure links, load

from database, etc.

• Current status:
• “Skeleton” software package based
• n L1Topo control software
• Include few simple methods
• Hardware emulators are set up and

ready for testing and development

• Many specifications still need to be

determined by firmware engineers

Upgrade

SLIDE 7

Doktoranddag June 19, 2018 Eva Hansen 7

4-jets - Motivation

• Paired dijet resonances are predicted in many SM extensions
• Supersymmetry with R-parity violating (RPV) couplings allows

the lightest supersymmetric particle (LSP) to decay to two jets

• Models with Dirac gauginos, additional gluinos
• Axigluons, colorons, compositeness, topcolor
• Naturalness suggests higgsinos and

top squarks below 1 TeV

• Top squarks in R-parity conserving

scenarios have been thoroughly searched for and are ~excluded below 1 TeV

• Allowing RPV couplings significantly

relaxes existing bounds on mass

Analysis

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Doktoranddag June 19, 2018 Eva Hansen 8

4-jets – Results and outlook

• First iteration was published in EPJ C with

2015 data

• Focus was on SUSY with RPV couplings

allowing the lightest supersymmetric particle to decay to two jets

• Second iteration (Full run-2) is about to start
• More model independent
• Increase acceptance
• Background fit as primary method for

background estimation

• Fat jets with substructure

Analysis

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Doktoranddag June 19, 2018 Eva Hansen 9

Wavelets for emerging jets

• Emerging jets are are an interesting

signature which ~no LHC analyses are currently sensitive to

• Wavelets might be a model-independent way
• f picking up the structure of such object
• Very preliminary study of the possibility of

targeting emerging jets with wavelet techniques was slightly positive

• More thorough studies indicate wavelets

might not be efficient

• Substructure techniques could be more

fruitful

• Might be a master thesis project

Analysis/performance

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Doktoranddag June 19, 2018 Eva Hansen 10

Recommendations

• G
• t
• t

h e I n t e r n a t i

• n

a l S c h

• l
• f

T r i g g e r a n d D a t a A c q u i s i t i

• n

( I S O T D A Q ) , i f y

• u

a r e i n t e r e s t e d i n T D A Q s

• f

t w a r e a n d h a r d w a r e

• T

e a c h t h e l a b

• f

I n t r

• d

u c t i

• n

t

• P

a r t i c l e P h y s i c s , i f y

• u

l i k e t

• p

l a y w i t h N I M m

• d

u l e s a n d

• s

c i l l

• s

c

• p

e s a n d w a n t t

• k

n

• w

t h e m u

• n

l i f e t i m e

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Back up

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Jet calibration chains

Anti-kt R=0.4 EM jets Anti-kt R=1.0 LCW jets