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Jet Energy Correction: Startup Needs and Plans for Calibration and Data Analysis

This document outlines the requirements and action items for the startup phase of Jet Energy Correction efforts, including factorized corrections, offset determinations, and noise corrections. Key tasks involve analyzing pile-up samples, fine-tuning pT dependence in jet and photon triggers, and acquiring essential simulation inputs before the beam. Collaboration with physics analysis groups (PAGs) is critical for optimizing thresholds and refining calibrations across various samples. Personnel needs for successful execution are also highlighted, ensuring a robust approach to precision jet energy corrections.

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Jet Energy Correction: Startup Needs and Plans for Calibration and Data Analysis

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  1. Jet Energy Correction: Startup Needs • Factorized corrections (above) have the following needs. • Work we need to do before beam. • Make more progress on our plan (AN-2007 / 055) • Offset (L1) • Determine the first simple offset corrections from pile-up samples (MC needed). • Determine the noise corrections from the calorimeter global runs (in progress). • pT dependence (L3) • Deeper understanding of g/Z + jet pT balance using the MC (in progress). • Inputs needed from DPG before beam. • We critically need a simulation tuned to reproduce the testbeam p response. • Ability to reset p response at ± 1s uncertainty to estimate jet energy error. • We are encouraged that a Calorimeter Simulation Task Forced has formed. Robert Harris, CMS Jet Energy Correction Meeting

  2. Jet Energy Correction: Startup Plans • Work with the first 10 pb-1 and needed triggers • Offset from noise and pile-up in zero-bias triggers (beam crossings). • Underlying event from min-bias & jet triggers. • Dijet pT balance with HLT dijet pT triggers which use (pT1 + pT2)/ 2. • We will need to optimize threshold values and trigger on uncorrected jet pT. • g + jet pT balance with photon triggers • Will need many more thresholds & prescales: g PT ~ 10, 20, 40, 80 GeV. • Z + jet pT balance with both Z gmm and Z g ee. • Need somebody on the Z g ee + jet channel now. Want to use the first Z signals. • Links to the PAGs with 10 pb-1 • Provide to PAGs the required corrections for each sample / period. • Advise PAGs on the optional corrections. Provide some MC corrections before data. • Work with PAGs on feedback to jet corrections that come from jet analysis • Topics like inclusive Jet pT, dijets, photon + jet, Z + jet. • From 10 to 100 pb-1 • Refine existing calibrations and prepare for the precision calibration from top. Robert Harris, CMS Jet Energy Correction Meeting

  3. Jet Energy Correction: personnel needs • FTE rough estimates for corrections with 10 pb -1 of data. Topic NeedHave • Offset • Zero-Bias & Min-bias data analysis with Hcal expertise 1½ • Zero-suppression dependence and extraction of correction 2½ • h dependence: dijet pT balance • Dijet pT trigger expertise, balance, and correction 1½ • pT dependence: g + jet pT balance • Photon reco & e-scale, p0/h background subtraction 1½ • g+jet balancing and extraction of correction in barrel 2½ • pT depedence: Z + jet pT balance • mm and ee samples reco and background expertise 2½ • Optional corrections • EMF, flavour dependence, UE, and parton 31 • Closure and Error • Validation, closure, and determination of JES error 30 Total134 Robert Harris, CMS Jet Energy Correction Meeting

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