LIP-CMS project Joao Varela, LIP & IST ECFA meeting, Coimbra, 15 May 2015

LIP-CMS project

Joao Varela, LIP & IST

ECFA meeting, Coimbra, 15 May 2015

LIP-CMS, ECFA meeting, J. Varela 2

The LIP-CMS group

2007

ECALPPS

Trigger/DAQ

Top quark mass Charged HiggsHiggs in gg

Bs,d→ mm rare decay

15 May 2015


Coordination positions in CMS

• CT-PPS Project Manager (Level-1), since 2014 (J. Varela)• CT-PPS Timing Detector Coordinator (Level-2), since 2014 (M. Gallinaro)

• ECAL Electronics Coordinator (Level-2), since 2011 (J. C. Silva)

• L1 Trigger Project Manager (Level-1), 2007-11 (J. Varela)

• Coordinator HGC software and performance, 2015 (P. Silva*)

• Co-convener (Level-2) of the CMS B Physics Group (B PAG), since 2014 (N. Leonardo)• Co-convener (Level-3) of CP violation and rare decays group, 2013-14 (N. Leonardo)• Co-convener (Level-3) of Quarkonium analysis working group, 2013-2014 (P. Faccioli)

• Editor several top papers: x-section w/taus, Vtb, charged H, since 2102 (M. Gallinaro)• Co-convener (Level-2) of the CMS Top Quark Physics Group (Top PAG), since 2015 (P. Silva *)• Co-convener (Level-3) of top quark mass, 2013-14 (P. Silva*)

• Co-convener (Level-3) of b-tag performance working, since 2012 (P. Silva *)

• Co-convener (Level-2) of the CMS Higgs Physics Group (Higgs PAG), since 2015 (A. Dravid *)• Co-convener (Level-3) Higgs properties, 2013-14 (A. David*)

• Editor of SUSY legacy paper on combined 1&2 lepton stop search, 2014-15 (P. Bargassa)

• Member of Statistics Committee, since 2015 (P. Vischia)• Deputy Spokesperson, 2012-13 (J.Varela)

CT-PPS

ECAL & Trigger

B physics

Top

Higgs

SUSY

Phase 2 Upgrade

General

* now with CERN

15 May 2015


Outline

• Detector operations• Physics

– Higgs– Top– SUSY– B-physics and Heavy Ions

• Detector upgrades• Outreach

15 May 2015


Detector Operations

15 May 2015


CMS detector responsibilities

Main LIP responsibilities in the construction of the CMS Experiment:

• ECAL Data Acquisition System– Full responsibility for design, construction and commissioning of the ECAL Data Acquisition

System– Frontend electronics (ADC chip)

Coordination positions :– ECAL Run Coordinator, 2010-2013 (A. David):– ECAL Electronics Coordinator, since 2010 (J. C. Silva).– ECAL Data Acquisition Coordinator, 2008-10 (A. David) 2011-14 (P. Parracho).

• L1 Trigger System– Contributions to the design, construction and commissioning of the CMS Level-1 Trigger System.

Coordination positions :– L1 Trigger Project Manager, 2007-11 (J. Varela)– L1 Trigger Data Quality Monitoring Coordinator, 2010-12 (J. Pela), 2013 (F. Nguyen)

15 May 2015


ECAL and Trigger operations

CCS Sup

TCC Sup

SLB Sup

DCC Sup

Hardware

OD Mon

ECAL Sup RCMSECAL FM

SRP Sup

TTC Sw

Access lock

DCU Sup

PVSSCondDB

ConfDB

localDAQ

Test Sup

localDQM

Trigger

CDAQ

FE

TCC

SLB

DCC

SRP

TTCci

LTC

FM GUI

Mon UI

ECAL DB

DB GUI

DuckCAD

GenericConf

Laser Sup

TTCf Sup

The LIP group has actively participated in the ECAL and L1 Trigger operations since 2009.

2011

2011

Hardware

Software

15 May 2015


Higgs physics

15 May 2015


Higgs discovery

Higgs in ggDiscovery of the Higgs boson in the di-photon decay channel:• Two members of the LIP group (A. David, P.

Musella) had a major role in this analysis• A.David was main editor of the analysis

documentation. • P. Musella became co-coordinator of the CMS

analysis group "Higgs in two-photons".

15 May 2015


Higgs properties

• Mass– Exp. Uncertainties

• Spin– J=0, by excluding alternatives

• Parity– Amplitude decomposition → EFT

• Scalar couplings– κ→ κ(q) → f(q) → EFT

A member of the group (A. David now with CERN) was co-convener of the CMS analysis group "Higgs properties” (2013-14).

Spin 1

Spin 2 prod. via gluon fusion Spin 2 production via qqL

15 May 2015


Top quark related physics

15 May 2015


Top quark measurements

• Cross section: PLB 695(2011)424– Contribution to First measurement at LHC

• Cross section and mass: JHEP 07(2011)049– First mass measurement at LHC

• Cross section with taus: PRD 85(2012)112007– First measurement with top→taus at LHC

• Top quark mass: EPJC 72(2012)2202– Most precise measurement in dilepton channel

• Cross section with taus @8TeV: PLB 739(2014)23– Most precise measurement with taus

• Heavy flavor content (xsec, Vtb, width): PLB 736(2014)33– Most precise measurements of: Vtb, top quark width

The LIP group performed several top quark measurements (M. Gallinaro, P. Silva, P. Vischia, A. Nayak, N. Almeida, M. Jordão, P. Ribeiro, M. Bluj)

15 May 2015


Physics objects

b-tagging efficiency in top quark events

JINST 7 (2012) P01001, JINST 8 (2013) P04013

Tau lepton identification: fake rate/efficiencies

15 May 2015


Search for charged Higgs

The LIP group (P. Vischia, M. Gallinaro, et al.) performed the search for: • a light charged Higgs in decays of the top quark. • a heavy charged Higgs decaying in top quark

The measurement of the LIP group in collaboration with Helsinki provided the best limits in the branching ratio of top decay in charged Higgs.

• Light charged Higgs (mH<mtop ): JHEP 07(2012)143, HIG-12-052• Heavy charged Higgs (mH>mtop): HIG-13-026, HIG-14-023 (paper in preparation)

15 May 2015


Top quark studies at 13 TeV

• Plenty of top quark events in Run 2• Look for deviations to the SM

– Improve systematics, extend to regions limited by statistics

• Tau (mis-)Identification efficiency• Top quark production studies

– Tune identification/bkg algorithms– Cross section: check production mechanism at 13 TeV– Same final state (ttbar), other production modes (BSM)– e.g explore links to Higgs exotic decays– Boosted tops, b-tags, taus, etc.

• Charged Higgs search:– Heavy H+ search limited by statistical unc.– Improve limits, extend to higher masses

from slide by C. Campagnari

“core” ttbar region

event selection

region

15 May 2015


SUSY physics

15 May 2015


Participation in the search for stop pair production in the single-lepton final state (published)

Stop search: 2- & 3-body decays in 1lepton

• Leading team of 6 people through 3 institutes.

• Wrote a sizeable fraction of the single-lepton analysis note (AN-14-067)

• Wrote the single-lepton Physics Analysis Summary (SUS-14-015)

• Editor of the 8 TeV legacy paper, combining the result of 1-lepton + 2-lepton searches (under review)

15 May 2015

Eur. Phys. J. C 73 (2013) 2677

The LIP group (P. Bargassa, L.Lloret) has introduced new methods in the search for stop quark in single lepton channel (2- & 3-body decays) which improved the CMS sensitivity in this channel (on-going):


Motivation:• Search for supersymmetry with compressed mass spectra• m(t1)-m(c0

1)< 80 GeV/c2 leads to the observed Cold Dark Matter density• This is where 4-body decays of the stop dominate

Stop search in 4-body decays

Collaboration with Vienna group in PAS- SUS-14-021.

Pursue the stop search in the 4-body decay at 13 TeV.

The LIP(CMS) group will contribute through the following directions to this search:• New discriminating variables• Testing simple versus MVA selection• Reshaping the signal regions • Add the 1e+jet(s) final state• Systematic uncertainty studies

15 May 2015

PAS- SUS-14-021


B-physics & heavy ions

15 May 2015


Measurements in Run 1

• Steering the CMS B Physics Group

• Major role in flagship measurement Bs,Bμμ

• Participation of LIP members in Heavy Ions studies:

• Led measurement of Y(nS) cross sections in pp• Led measurement of Y(nS) suppression in PbPb• Led measurement of Psi(nS) and Y(nS)

polarizations

15 May 2015


Perspectives in Run 2

• Plan to perform first measurements of b-hadron and onia production at 13 TeV

• Bulk of the measurements will be performed with the larger datasets

– Precision measurements– Search for very rare decays

• Planned focus of LIP involvement– B and Onia production

– Rare decays: Bd→μμ, t→μμμ

Lepton flavor Violation process

15 May 2015


Detector Upgrades

15 May 2015


L1 Trigger upgrade

• Contribution to the new L1 Trigger System (Phase 1 Upgrade), with full responsibility in developing the high-speed optical links that interface the ECAL electronics to the Trigger System.

• Coordination positions :– Chief engineer of the oSLB/oRM link project, since

2012 (J. C. Silva).

15 May 2015

CMS-TOTEM Proton Spectrometer

p p → p + X + p

Xi

j

p

p

TECHNICAL DESIGN REPORT

CT-PPS Project Coodinator: J. Varela


Detector concept

CT-PPS concept:

1) Proton spectrometer making use of machine magnets

2) Two tracking stations with 3D pixel detectors

2) One stations with timing detectors

Exclusive WW

Inclusive WW

10 ps

• Use timing to reject pileup background– time difference of two protons is

correlated to collision vertex

ToF vs. z-vertex

15 May 2015


CT-PPS physics motivations

• Measure gg W+W- , e+e-, m+m-, t+t-

• Search for AQGC with high sensitivity• Search for SM forbidden ZZ , gg gggg couplings

QC

DE

WK

LHC used as a photon-photon collider

QCD physics

BS

M Search for new resonances and dark matter • Clean events (no underlying pp event)• Independent mass measurement by pp system

Dijet mass fraction

• Test of pQCD mechanisms of exclusive production.• Gluon jet samples with small component of quark jets

15 May 2015


R&D in CMS upgrade program

• Phase I Upgrade– L1 Trigger upgrade: optical links (on-going)– CT-PPS: timing detector (on-going)

• aiming at 10 ps time resolution• high rate and high radiation environment

• Phase II Upgrade (HL-LHC)– LIP participation is under discussion– ECAL Trigger/DAQ backend system

• contribution to DAQ hardware

– Endcap calorimeter: frontend electronics• challenging silicon high-granularity 3D calorimeter• exploit possibility of ~ 50 ps time resolution per Si pad

15 May 2015


Training & Outreach

15 May 2015


Thesis

• Data Acquisition and Filtering in the Electromagnetic Calorimeter of the CMS Experiment, PhD• Physics Reconstruction and Simulation in the CMS Experiment: study of UED models , Master• Studies of the discovery potential for Minimal Universal Extra Dimensions in the four-lepton

final state in proton-proton collisions at the Large Hadron Collider with the CMS detector, PhD• Towards the measurement of the ttar cross section in the tau dilepton channel in pp collisions,

Master• Search for the charged Higgs boson using the CMS Detector, Master• Multi-Lepton Final States in the Search for New Physics at the Large Hadron Collider, Master• Measurement of the inclusive photon production cross section and study of associated W-

photon production in proton-proton collisions at the LHC, PhD• Probing the Heavy Flavor of Top quark decays produced in proton-proton collisions at the

Large Hadron Collider with the CMS experiment, PhD• Study of top quark properties and tests of the Standard Model at the LHC with the CMS

detector, PhD (on-going)• Search for the supersymmetric stau lepton, PhD (on-going)• Search for charged Higgs in top events, PhD (on-going)• Development of high-performance timing detectors for the CMS forward proton spectrometer,

PhD (on-going)

15 May 2015

8 PhD, 4 Master thesis


Outreach

Information to students

15 May 2015

18 weekly lecturesOrganised since 2012

Documents

LIP-CMS project Joao Varela, LIP & IST ECFA meeting, Coimbra, 15 May 2015