# Phat Srimanobhas
Experimental Particle Physicist @ CMS experiment, CERN LHC
## About me
Hey there! I'm an Assistant Professor at Chulalongkorn University's Physics Department in Thailand. I teach fun stuff like "Physics in Films" and dive into deeper topics like Electromagnetism. I'm part of the Compact Muon Solenoid (CMS) crew, where we explore things like magnetic monopoles and use the CMS detector to seek out four top productions. Besides guiding my students through exciting projects at the Future Circular Collider and diving into machine learning, I also play a role in shaping the next phase of CMS software development. Back home, I take the lead in Thai-CERN research projects. Exciting times ahead!
## Academic career
* **Sep 2025 - Aug 2026:** CERN Scientific Associate
* **Jan - Dec 2024:** LPC Distinguished Researcher, Fermilab
* **Jan 2019 - June 2020:** CERN Scientific Associate
* **Aug 2018 - Present:** Assistant Professor, Department of Physics, Faculty of Science, Chulalongkorn University
* **Jan 2014 - July 2018:** Lecturer, Department of Physics, Faculty of Science, Chulalongkorn University
* **2011:** Ph.D., University of Antwerp, Belgium and Chulalongkorn University, Thailand. Thesis advisors: Albert DE ROECK (UA) and Burin ASAVAPIBHOP (CU). Thesis title: Spin sensitive variables for the decay products of supersymmetric particles.
* **2004:** CERN summer student
* **2003:** B.Sc. (First Class Honors), Mahidol University, Thailand. Senior project advisor: Michael ANTONY ALLEN. Senior project title: The occultation of the asteroids.
## Awards, memberships and roles:
* **2026:** Track convener on “Software, Computing and Data Handling", ICHEP 2026 Natal, Brazil
* **2026:** Chair of the 28th Conference on Computing in High Energy and Nuclear Physics (CHEP2026), Chulalongkorn University, Thailand \[[indico](https://indico.cern.ch/event/1471803/)]
* **2024:** Co-Chair of the Flavor Physics and CP Violation (Bangkok) and Asia-Europe-Pacific School of High Energy Physics (Thailand)
* **2023:** Track convener on “Offline Computing", the 26th International Conference on Computing in High Energy and Nuclear Physics (CHEP), Norfolk, USA
* **Jun 2022 - 2025:** International advisory committee, Flavor Physics and CP violation (FPCP) conferences
* **Jan 2022 - Present:** Principal investigator (PI) for Thai HEP research proposals
* **Since 2018:** Sub-Committee on CERN-DESY-GSI/FAIR Project under the Royal Initiative of Her Royal Highness Princess Maha Chakri Sirindhorn
## Roles at CMS
* **Sep 2024 - Aug 2026:** Level-1 coordinator of Offline Software & Computing (O\&C)
* **Jan 2022 - Present:** Team leader of Chulalongkorn University in CMS collaboration
* **Jan 2021 - Aug 2024:** Level-2 convener of CMS Phase-2 software, Offline and Computing coordination
* **Jul 2018 - Aug 2020:** Level-1 coordinator of Physics Performance and Dataset (PPD) group
* **Sep 2017 - 2023:** CMS School Committee
* **Sep 2013 - Aug 2016:** Level-2 convener of Physics Data-Monte Carlo Validation
* **2013:** Monte Carlo contact person of Higgs-Exotica group
* **2013 - Present:** Official CERN and CMS guides
* **2012 - 2013:** Physics Performance and Dataset (PPD) contact person of Exotica group, and Data Quality Monitoring (DQM) developer, and validator for both JetMET trigger and SUSY groups
* **2011 - 2021:** Deputy team leader of Chulalongkorn University in CMS Collaboration
* **2011 - 2016:** Physics Analysis Tools tutorial team
## My Git
* My GitHub \[[Link](https://github.com/srimanob)]
* CU e-Science HTC-HPC Cluster and Cloud \[[Link](https://esciencecu-twiki.sc.chula.ac.th/)]
## Selected publications
* A New Higgs Boson with Electron-Muon Flavor-Violating Couplings, Physics Letters **B** 845 (2023) 138129, R. Primulando, J. Julio, N. Srimanobhas, P. Uttayarat
* Evidence for four-top quark production in proton-proton collisions sqrt(s) = 13TeV, CMS collaboration, PLB **844** (2023) 138076 (thesis co-supervisor, with Freya Blekman, of Vichayanun Wachirapusitanand)
* Code Transformation Impact on Compiler-based Optimization: A Case Study in the CMSSW, T. Ploensin (Chulalongkorn U.), K. Piromsopa (Chulalongkorn U.), N. Srimanobhas(Chulalongkorn U.), J.Phys.Conf.Ser. **1936** (2021) 1, 012023. (thesis co-supervisor)
* Search for the production of four top quarks in the single-lepton and opposite-sign dilepton final states in proton-proton collisions at sqrt(s) = 13TeV, CMS collaboration, JHEP **11** (2019) 082. (thesis co-supervisor, with Freya Blekman, of Vichayanun Wachirapusitanand)
* The CMS trigger system, CMS collaboration, JINST **12** (2017) P01020. (author of HLT MET section)
* Search for dark matter and unparticles in events with a Z boson and missing transverse momentum in proton-proton collisions at sqrt(s) = 13 TeV, CMS collaboration, JHEP **03** (2017) 061, Erratum: JHEP 01 (2018) 056. (analysis review committee)
* Searches for third-generation squark production in fully hadronic final states in proton-proton collisions at sqrt(s) = 8 TeV, CMS collaboration, JHEP **06** (2015) 116. (co-author)
* Search for dark matter, extra dimensions, and unparticles in monojet events in proton-proton collisions at sqrt(s) = 8 TeV, CMS Collaboration, Eur. Phys. J. C **75** (2015) 235. (co-author)
* Search for invisible decays of Higgs bosons in the vector boson fusion and associated ZH production modes, CMS Collaboration, Eur. Phys. J. C **74** (2014) 2980. (co-author)
* Search for dark matter and large extra dimensions in monojet events in pp collisions at sqrt(s) = 7 TeV, CMS Collaboration, JHEP **1209**, 094 (2012). (co-author)
* A review of the spin determination of supersymmetric decay chain via neutralino at the LHC, N. Srimanobhas and B. Asavapibhop., J. Phys. G **38**, 075001 (2011). (author, Ph.D. Thesis.)
## Contact me
* Emails: phat.s\[-AT-]cern.ch, Norraphat.S\[-AT-]chula.ac.th
* Post:\
Norraphat SRIMANOBHAS \
Department of Physics, Faculty of Science, Chulalongkorn University,\
254 Phaya Thai Rd, Wang Mai, Pathum Wan, Bangkok,\
THAILAND 10330
# Teaching at Chula
[2023](https://twiki.cern.ch/twiki/bin/view/Main/PhatSrimanobhasTeachingCU2023) | [2022](https://twiki.cern.ch/twiki/bin/view/Main/PhatSrimanobhasTeachingCU2022) | [2021](https://twiki.cern.ch/twiki/bin/view/Main/PhatSrimanobhasTeachingCU2021) | [2020](https://twiki.cern.ch/twiki/bin/view/Main/PhatSrimanobhasTeachingCU2020)
2019 (no class) | 2018 (no class) | [2017](https://twiki.cern.ch/twiki/bin/view/Main/PhatSrimanobhasTeachingCU2017) | [2016](https://twiki.cern.ch/twiki/bin/view/Main/PhatSrimanobhasTeachingCU2016) | [2015](https://twiki.cern.ch/twiki/bin/view/Main/PhatSrimanobhasTeachingCU2015) | [2014](https://twiki.cern.ch/twiki/bin/view/Main/PhatSrimanobhasTeachingCU2014)
# Public talks
* \[9 Jan 2026] Introduction to CERN and High Energy Particle Physics Programs: [Link](https://drive.google.com/drive/folders/1a6nlVxZ5EH5OKEOakSmIAMEwbaGIHr8B?usp=sharing)
# Open positions
## รับสมัครงาน สายวิศวะคอมพิวเตอร์และวิทยาการคอมพิวเตอร์ ปฎิบัติงาน ณ ประเทศสวิสเซอร์แลนด์!!
Feb 10, 2024
รับสมัครผู้จบป.ตรี ป.โททางด้าน Computer Science หรือ Computer Engineering ที่สนใจงาน site support operator หน้าที่หลักเพื่อคอยตรวจสอบการทำงานของ computing infrastructure และ central services ปฎิบัติงาน ณ การทดลอง CMS, CERN ประเทศสวิสเซอร์แลนด์
ผู้สนใจโปรดส่ง CV มาที่ ภายในวันที่ 28 ก.พ. 2567 อนึ่ง การคัดเลือกเป็นการสัมภาษณ์ร่วมกับผู้เชี่ยวชาญจากเซิร์น
### Requirements
* bachelor degree in computer science or engineering or similar
* experience with Linux service management and administration
* experience with python and shell scripting
* fluent in English and good communication skills
These technical competencies are not a requirement but certainly a plus:
* experience with common web technologies like html, cgi, and JavaScript
* experience with ticketing systems and computing service support
* experience with batch systems and high throughput computing on Grid/Cloud
* experience with Nagios and/or Grafana - experience with software development and code design
ข้อมูลเกี่ยวกับ Job description โดยละเอียดรวมถึงเบื้องต้นเกี่ยวกับ CMS, CERN สามารถอ่านได้ท้ายประกาศนี้
เงินเดือน: ประมาณ 160,000 บาท (จ่ายเป็น CHF) รวมถึงสนับสนุนค่าตั๋วเครื่องบินเดินทางไปกลับเจนีวา, ประกันสุขภาพ และค่าใช้จ่ายเพื่อเตรียมตัวก่อนออกเดินทาง
งานนี้เป็นงานประจำ ทำงานที่ European Organization for Nuclear Research, CERN, Geneva Switzerland สัญญา 1 ปี และสามารถต่อได้ 1 ปี สามารถเริ่มงานได้เร็วที่สุดประมาณเดือนเม.ย. 2567
### Job description
We are looking for one scientist/engineer at CERN to join a team of experts that monitors the health of the distributed computing infrastructure and central services of CMS. The successful candidate will operate, maintain, and enhance the testing infrastructure that assesses the readiness of sites in a quantitative way. Communication via ticketing systems and email is of high importance as CMS sites are in various time zones. The successful candidate will provide coverage during the European time zone and work with admins from the data centers around the world to help optimize resource usage, and debug site issues. She/he will be trained in all aspects of the distributed computing infrastructure of CMS and the technical details of grid computing. The successful candidate will operate time critical tasks and services and take over mission critical monitoring responsibilities. A contribution to the development efforts of the computing monitoring infrastructure is envisioned. The monitoring infrastructure for sites and services is provided by CERN and shared by all LHC experiments. It is based on Nagios, HDFS, ElasticSearch, InfluxDB, Kibana, and Grafana. Probes are experiment specific and the successful candidate is expected to contribute to maintenance, enhancing, and development of additional probes. เกี่ยวกับ CMS และ Computing Infrastructure The Compact Muon Solenoid (CMS) is an experiment that investigates high energy particle collisions of the Large Hadron Collider (LHC) at CERN in Geneva, Switzerland. The CMS collaboration operates a large and distributed computing infrastructure to record, process and analyze CMS data and simulations at petabyte scales. Institutes around the world at about 70 sites provide computing and storage resources to this activity.
Computer services and data transfers between the various sites are based on grid technologies and use sophisticated software to achieve the required high scales of transfer volumes and processing throughput. State of the art programming technologies are used for the different systems. The processing infrastructure is based on distributed state-machines that handle job submission and tracking. The data transfers are based on a highly performant agent infrastructure. Systems use the latest database technologies, both relational and NoSQL.
Central services use a hierarchical http cache infrastructure to provide access to alignment and calibration constants of the detector to jobs running on the grid. To check the performance of the sites, a sophisticated test suite is probing the different services of each grid site regularly and allows for early discovery and mitigation of problems. The uninterrupted service of all sites and central services is the basis for successful delivery of all centrally produced samples to the CMS Collaboration and to guarantee analysis access for all physicists to produce high quality physics results. Expert operators are needed to continually monitor site performance as workflows are time critical and very important for the overall success of the CMS Experiment. A good overview is shown in the following movie: