Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Poster (a)

HK 51.7: Poster

Donnerstag, 2. April 2020, 16:30–18:30, Zelt

Low-pT π0 and η reconstruction via their Dalitz decay in pp collisions at s=13 TeV with ALICE — •Florian Eisenhut for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt

At the Intersecting Storage Rings (ISR) at CERN, an excess of dielectron pairs over the expectation from known dielectron sources had been measured at low invariant mass and small pair pT,ee in pp collisions at √s = 63 GeV. With the ALICE experiment a similar measurement can be performed by reducing the magnetic field of the central barrel solenoid. However, in order to conclude on such an excess an independent measurement of the η meson by ALICE at LHC energies is crucial as it represents the dominating contribution to the hadronic background in the LMR region.

In this poster, first results of the π0 and η measurement via its Dalitz decay channel in pp collisions at √s = 13 TeV with reduced magnetic field will be presented. This alternative approach allows a reconstruction of these mesons at lower momentum compared to similar analysis using calorimeters while trying to reduce the systematic uncertainties compared to the analysis of the two-photon decay channel via conversions. Thus, it could help to answer the question of a possible excess of the dielectron production at LHC energies.
Supported by BMBF and the Helmholtz Association.

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