R&D FOR THE ATLAS SEMICONDUCTING TRACKER UPGRADE: CERN SINGLE MODULE SYSTEM ADRYANNA SMITH BAYLOR UNIVERSITY DUKE/TUNL REU

OUTLINE Purpose for traveling to CERN Tasks at the lab Single module tests ttbarV analysis Saint Genis-Pouilly, France 2

WHY WE WERE SENT TO CERN CERN experiments demand enormous collaborations Characterizations and documentation of detector components, performed by many institutions Duke is a primary source of manpower for SCT upgrade Knowledge gained at Duke -> Knowledge helping with CERN setup -> Knowledge for future Duke setup Atlas Detector Controls 3

THE ASSIGNMENT Relocation of electronics and DAQ system to new building Re-commissioning of the new location Lots of wires Lots of power supplies Lots of boards Lots of troubleshooting 4

THE NEW LOCATION 5

THE SINGLE MODULE Stream 1 Stream 0 Stream 1 Hybrid 0 Hybrid 1 One Module Power Supplies and Interlock 6

TESTS iDelay, Strobe Delay, Trim Range, 3 Point Gain, etc. 3 Point Gain Send in 3 levels of charge pulse: 0.52, 1.00, 1.48 fC Pulse comes in… hit registers in a % of channels, depending on the threshold Variance in threshold distribution  “Noise” reading Occupancy vs. Threshold V 50 7

*Result: Higher temperature -> higher noise 8

*Result: Higher HV bias -> lower noise, to an extent 9

FUTURE OF THE CERN Will likely move stations again within SR1 CO 2 lines for cooling stavelets Atlys board will replace HSIO board Connect stavelets and run tests Document the setup and test results Other institutions (such as Duke) can replicate our work Nascent Twiki page 10

V ANALYSIS ttbar V = Vector Boson (Spin 1, force carrier) Duke graduate student Chen Zhou’s analysis: Same Sign Dilepton Decays Interested in looking at Triplepton (3L) Decays using AIDA technique 11

A CLOSER LOOK Uses √s = 8 TeV data from ATLAS detector These cross sections investigate top-EW coupling ttbarZ is particularly interesting Similar to ttbarH decay channel Studying cross section of Higgs interactions is hot topic 2 Major Trilepton Regions: Make further cuts based on E T, isolation (tight/loose), and jets 3L-Z 3L-noZ e- e+ μ- μ+ the lepton options 12

ANALYSIS UPDATE Lots of code to decipher Lots of terms to decipher SCT upgrade work, background reading, and lectures kept us engaged Beginning to make progress… but in the end, the summer ran out ssh -Y 13

ACKNOWLEDGEMENTS Thanks goes to Mark Kruse and Ayana Arce for acting as our advisors. A keen gratitude also towards Chen Zhou for his mentorship at CERN. And of course, the other undergrads, Chloe Lindeman, Bolaji Eniwaye, Shelby Burant, and Matt Tobin! 14

SOURCES Carlos Garcia Argos (2012), Valencia University Procedure for Operating the HSIO DAQ System for Single Modules in the B180 Setup Chen Zhou, et al. (2015), ATLAS Paper Measurement of the ttbarW and ttbarZ production cross sections in pp collisions at √s = 8 TeV with the ATLAS detector Chen Zhou (2015), ATLAS AIDA Group Poster Measurements of the ttbarW/Z production cross sections using events with same-sign leptons from pp collisions at √s = 8 TeV with the ATLAS detector 15

DEEP BURNING QUESTIONS?? You may now ask me and Chloe questions FAQ When did you both first learn that you were spectacular? From a young age. Is physics good for anything? It’s not bad for anything and its study has yet to be linked to cancer (radiation), obesity (#desklife), or deforestation (problem sets). How can CP Violation be resolved? Use a small enough wavelength and you can resolve almost anything. Where is CERN? In an expensive land, far, far away from Taco Bell. 16