# LXX International conference "NUCLEUS – 2020. Nuclear physics and elementary particle physics. Nuclear physics technologies"

Oct 11 – 17, 2020
Online
Europe/Moscow timezone

## Exclusive pi^0p electroproduction in the resonance region with CLAS12

Oct 16, 2020, 4:15 PM
20m
Online

#### Online

Oral report Section 4. Relativistic nuclear physics, elementary particle physics and high-energy physics.

### Speaker

Anna Golubenko (Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics)

### Description

The excitation of nucleon resonances (N*) by real and virtual photons is an important source of information on the structure of excited nucleon states and dynamics of the nonperturbative strong interaction underlying the resonance generation from quarks and gluons [1, 2]. This information has already become available from the nucleon resonance electroexcitation amplitudes ($\gamma_v p N^*$ electrocouplings). Exclusive $p\pi^0$ electroproduction channel is the important source of information on $\gamma_v p N^*$ electrocouplings [3]. The CLAS12 detector [4] is the only facility in the world capable to provide information on $\gamma_v p N^*$ electrocouplings from the data of $\pi^0p$ channel at still almost unexplored range of photon virtualities $Q^2>5.0$ GeV$^2$ and to extend the studies of $N^*$ in the mass range $>2.0$ GeV.

The preliminary results from analysis $\pi^0p$ electroproduction data measured with CLAS12 will be presented in the talk. Application of the exclusive event selection procedure, developed based on MC simulation, to the CLAS12 $\pi^0p$ data analysis provided high purity sample of $\pi^0p$ events in the kinematic range covered by the measurements in RG-K run. The results obtained are paving a way for extraction of beam asymmetry and eventually cross sections for exclusive $\pi^0p$ electroproduction measured with the CLAS12.

1. I.G.Aznauruan and V.D.Burkert, Progr. Part. Nucl. Phys. 67, 1 (2012).

2. V.D.Burkert and C.D.Roberts, Rev. Mod. Phys. 91, 011003 (2019).

3. N.Markov et al. (The CLAS Collaboration), Phys. Rev. C. 101, 015208 (2020).

4. V.D. Burkert, L. Elouadrhiri, K.P. Adhikari et al. Nuclear Inst. and Methods in Physics Research, A 959 (2020) 163419

### Primary author

Anna Golubenko (Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics)

### Co-authors

Victor Mokeev (Thomas Jefferson National Accelerator Facility) Prof. B Ishkhanov (Moscow State University, Faculty of Physics, Moscow, Russia; Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow, Russia)