Measurement of light-by-light scattering in ultraperipheral PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV - INSPIRE

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Measurement of light-by-light scattering in ultraperipheral PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

CMS

Collaboration

2018

Report number:

CMS-PAS-FSQ-16-012

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

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Abstract:

A measurement of light-by-light scattering,

\gamma\gamma\to\gamma\gamma

, in ultraperipheral PbPb collisions at a centre-of-mass energy per nucleon pair of 5.02 TeV is reported. The analysis is conducted using a data sample corresponding to an integrated luminosity of

390~\mu\mathrm{b}^{-1}

recorded by the CMS experiment at the LHC. Light-by-light scattering processes are selected in events with two photons exclusively produced, each with transverse energy

\mathrm{E}_{\mathrm{T}}^{\gamma}>2~\mathrm{GeV}

, pseudorapidity

|\eta^{\gamma}|<2.4

, diphoton invariant mass

\mathrm{m}^{\gamma\gamma}>5~\mathrm{GeV}

, diphoton transverse momentum

\mathrm{p}_{\mathrm{T}}^{\gamma\gamma}<1~\mathrm{GeV}

, and diphoton acoplanarity below 0.01. After all selection criteria are applied, 14 events are observed, compared to expectations of

11.1 \pm 1.1

(th) events for the signal and

3.8 \pm 1.3

(stat) for the background processes. The significance of the light-by-light signal against the background-only hypothesis is 4.1 standard deviations. The measured fiducial light-by-light scattering cross section,

\sigma_{\mathrm{fid}} (\gamma\gamma\to\gamma\gamma)=122\pm46

(stat)

\pm29

(syst)

\pm4

(th) is consistent with the standard model prediction.

Note:

Preliminary results

Data
heavy ion: scattering
lead
photon photon: scattering
exchange: two-photon
peripheral
photon: transverse momentum
photon: transverse energy
mass spectrum: (2photon)
CERN LHC Coll

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