# Measurement of the triple-differential dijet cross section in proton-proton collisions at sqrt(s) = 8 TeV and constraints on parton distribution functions

## TL;DR

This paper reports a detailed measurement of the triple-differential dijet cross section at 8 TeV using CMS data, providing new constraints on parton distribution functions and the strong coupling constant.

## Contribution

It presents the first measurement of the triple-differential dijet cross section at 8 TeV and uses it to improve constraints on parton distribution functions and determine the strong coupling constant.

## Key findings

- Measured the triple-differential dijet cross section with high precision.
- Provided new constraints on parton distribution functions.
- Estimated the strong coupling constant as alpha[S](M[Z]) = 0.1199 +/- 0.0015 (exp) -0.0020 +0.0031 (theo).

## Abstract

A measurement is presented of the triple-differential dijet cross section at a centre-of-mass energy of 8 TeV using 19.7 inverse femtobarns of data collected with the CMS detector in proton-proton collisions at the LHC. The cross section is measured as a function of the average transverse momentum, half the rapidity separation, and the boost of the two leading jets in the event. The cross section is corrected for detector effects and compared to calculations in perturbative quantum chromodynamics at next-to-leading order accuracy, complemented with electroweak and nonperturbative corrections. New constraints on parton distribution functions are obtained and the inferred value of the strong coupling constant is alpha[S](M[Z]) = 0.1199 +/- 0.0015 (exp) -0.0020 +0.0031 (theo), where M[Z] is the mass of the Z boson.