# Bethe-Bloch Curve **URL:** \ **Category:** O²\ **Created:** [April 4, 2025, 8:38am UTC](https://alice-talk.web.cern.ch/t/bethe-bloch-curve/1659 "2025-04-04T08:38:20Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![amanojna](https://alice-talk.web.cern.ch/letter_avatar_proxy/v4/letter/a/3e96dc/32.png) [@amanojna](https://alice-talk.web.cern.ch/u/amanojna)\ **Post date:** [April 4, 2025, 8:38am UTC](https://alice-talk.web.cern.ch/t/bethe-bloch-curve/1659/1 "2025-04-04T08:38:21Z")
Dear Experts, I wanted to plot the **theoretically calculated Bethe-Bloch curve (dE/dx vs p)** for the **ALICE TPC** for different particles (e-, pions, muons, kaons etc). I could not find any documentations for it. Could you kindly help in finding the macros or data set for this. (by bethe bloch curve i meant the curve used to calculate the tpcNSigma for different particles ). Thanks Anantha ---
**Author:** ![amarin](https://alice-talk.web.cern.ch/letter_avatar_proxy/v4/letter/a/d9b06d/32.png) [@amarin](https://alice-talk.web.cern.ch/u/amarin)\ **Post date:** [April 5, 2025, 4:55pm UTC](https://alice-talk.web.cern.ch/t/bethe-bloch-curve/1659/2 "2025-04-05T16:55:52Z")
Dear Anantha, in slide 3 of [Sign in to CERN](https://indico.cern.ch/event/1462154/contributions/6193391/attachments/2977697/5242508/PIDperformance_APW2024_FErcolessi.pdf) you find the equation of the Bethe Bloch parametrization. The 5 parameters are the 5 parameters stored in the OCDB for each period. Best regards, Ana ---
**Author:** ![amanojna](https://alice-talk.web.cern.ch/letter_avatar_proxy/v4/letter/a/3e96dc/32.png) [@amanojna](https://alice-talk.web.cern.ch/u/amanojna)\ **Post date:** [April 5, 2025, 5:57pm UTC](https://alice-talk.web.cern.ch/t/bethe-bloch-curve/1659/3 "2025-04-05T17:57:14Z")
Dear @amarin , Thank you for your response. Could you please let me know how to get it from the OCDB? 😅. I am new here. Thanks Anantha