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Mohd Fadeli Md Halid

ROLE OF TRIGGER TO

CAPTURE PHYSIC

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 THE CMS TRIGGERMotivation and LHC challenges

 The CMS mon detecto! and t!igge!

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 The La!ge Had!on Collide!

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 The La!ge Had!on Collide!

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Higgs deca" at the LHC

Fo! lo# mass Higgs$ %est choice o& deca" channel is H'((

Highe! mass Higgs can %e sea!ched &o! sing )) and **channels

+eca" to % ,a!-s ve!" challenging

+eca"s to . ve!" inte!esting &o! Higgs /a!amete!s

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Higgs deca" at CMS

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LHC challenges0 data !ate

• At &ll LHC lminosit" #e have 11 events s/e!im/osed on an"discove!" signal

• 234 events /e! second 5 t"/ical event si6e o& 271 M%"tes 82T9"te:sec

• Eno!mos data !ate;

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Higgs -> 4=

)e #ant to select this t"/e o& event$ &o! e5am/le Higgs to >

mons

LHC t!igge! challenges 7 /ile7/

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Higgs -> 4= +30 MinBias

)e #ant to select this t"/e o& event$ &o! e5am/le Higgs to > mons#hich has this s/e!im/osed on it??So/histicated algo!ithmsnecessa!"

LHC t!igge! challenges 7 /ile7/

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In7time /ile /0 Same c!ossing di@e!ent inte!actions

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LHC challenges0 needle in aha"stac-

C+ c!oss sections a!e o!de!s o&magnitde la!ge! thanelect!o#ea- o! an" e5oticchannels

Event !ates0Inelastic0 234 H6

)'lD 0 233 H6

t7t%a!023 H6

H233 Ge0 3;2 H6

H33 Ge0 3;32 H6

88

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Eno!mos data !ate0 234 H6 → mo!e than

2T9"te:s

Minimm %ias in7time /ile7/ → 11 events /e!%nch c!ossing

Ot7o&7time /ile7/ → events &!om di@e!ent

%nch c!ossings

ove!la"ed

 Tin" c!oss sections &o! Higgs and ne# /h"sics→ selection 202322

All online → cant go %ac- and J5 it; Events a!elost &o!eve!K

Challenges

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CMS T!igge! S"stem

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 The CMS t!igge! s"stem

>3 MH6 in/t !ate to Level 2

Selection cannot %e done in 1ns so /i/elinedt!igge!

233 H6 Level 2 ot/t !ate

233 H6 #!itten at the ot/t Event Si6e 271 M%"tes

Level72 T!igge!0

→ Cstom made ha!d#a!e s"stem

→ The to/ic o& the !est o& this tal-

High Level T!igge!0

→ PC &a!m 2333 nits sing !econst!ction so&t#a!eand event Jlte!s simila! to the oNine anal"sis

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 The CMS Level 2 T!igge!Hge !eection necessa!"

→ so/histicated algo!ithms

2; +etecto! data sto!ed in &!ont7end/i/elines; Pi/elines dee/ enogh &o!21 %nch c!ossings Q;1µs

1; T!igge! decision de!ived &!om t!igge!/!imitives gene!ated on the

detecto!

Q; Regional t!igge!s sea!ch &o! Isolatede$ γ $ µ$ ets and com/te thet!ansve!se and missing ene!g" o& the

event; GCT ⇒ne5t slide;

>; Event selection algo!ithms !n on theglo%al t!igge!s; Mst give a t!igge!decision eve!" 1ns;

Can onl" se CAL and mon s"stems

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Level 2 t!igge! com/onents

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Glo%al mon t!igge!Mon t!igge! s"stem

e : uon c am ers

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e : uon c am ers Yellow: A lot o& I!on K78 Com/act MonSolenoid

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Com%ination o& th!ee

technologies+!i&t t%esCathode st!i/ cham%e!s

Resistive /late cham%e!sFo! t!igge!ing onl"

RedndantCom/lementa!" technologiesGeomet!ic ove!la/

 T!ac-s &!om di@e!ent s"stems com%ined inthe Glo%al Mon T!igge!Com%ination ses o/timal in&o!mation &!om each s"stem and is

less sensitive to %ac-g!onds$ noise$ etc;

L2 mon t!igge!

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P!ovide independent muon tracking toim/!ove mon !econst!ction$ es/eciall" athigh momenta

P!ovide a !o%st$ !edndant$ inde/endentLevel- trigger &o! mons$ a//l" th!esholdsin mon momentm at t!igge! level$ and/e!&o!m 9 identiJcation;

!"e Muon s#stem "as to:

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 The mon t!igge! s"stem

Old ne#

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Barrel:+!i&t7T%es +T$ Resistive7Plate7Cham%e!s RPC

$nd-%aps:Cathode7St!i/7Cham%e!s CSC$ Resistive7

Plate7Cham%e!s RPC

S%7detecto!

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 The +RIFT t%e cham%e!S%7detecto!

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Trigger segments from

each station are matched

together according toproper Look-up-Tables

•pt, position and charge are

assigned

Sea!ch &o! hit alignment in each mon station;

U/ to 1 mon segments /e!station &o! each9

A ghost s//!ession mechanism to !emove

&a-e o! #!ong candidates Pe!&o!med %" elect!onics on the cham%e!s

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 T!igge!ing at the LHC is a hge challenge

 The CMS t!igge! is highl" com/le5

 The GCT is a -e" com/onent in the t!igge!

Unde!standing the t!igge! and ta-ing the !ightdata sam/les #ill %e the -e" to ea!l"discove!" o& ne# /h"sics

)o!-ing on the t!igge! "o get "o! hands on

the data J!st

Conclsion

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E5t!a slideSim/lest t!igge! s"stem

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