Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 75: Invited Talks VI

HK 75.3: Invited Talk

Friday, April 1, 2022, 12:00–12:30, HK-H1

AMBER: A new QCD facility at CERN SPS — •Bernhard Ketzer for the AMBER collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115 Bonn

In the context of the Physics Beyond Colliders initiative at CERN, a Letter of Intent for a new general-purpose fixed-target facility at CERN's Super Proton Synchrotron was submitted by the AMBER collaboration in 2018. The unrivalled variety of particle beams available at the M2 beamline coupled with a state-of-the art multi-purpose spectrometer provides a unique opportunity to address fundamental questions of the strong interaction in the strong coupling regime.

The first phase of the experiment, which was approved by CERN in 2020, is scheduled to run from 2023 onward and covers three main topics: (i) a precision measurement of the proton charge radius using high-energy muon-proton elastic scattering, (ii) the measurement of pion valence and sea parton distribution functions, and (iii) the measurement of the differential cross section for antiproton production, an important ingredient for Dark-Matter searches. Paralleled by advances in theory, these measurements are expected to provide unique and important information on the structure of the lightest hadrons like protons and pions.

The talk will discuss the prospects and review the status of preparations. For phase II of AMBER, a proposal is currently being drafted, which will extend the studies to kaon-induced reactions. This will open the path to study kaon PDFs, polarizabilities, gluon PDFs, and the spectroscopy of strange mesons in an unprecedented way.