Erratum to: Light in the beam dump. Axion-Like Particle production from decay photons in proton beam-dumps
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Springer
Received: August 28, 2020 Accepted: August 31, 2020 Published: October 7, 2020
Babette D¨ obrich,a Joerg Jaeckelb and Tommaso Spadaroc a
CERN, Esplanade des Particules 1, 1211 Geneva 23, Switzerland b Institut f¨ ur theoretische Physik, Universit¨ at Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany c Laboratori Nazionali di Frascati INFN, Via E. Fermi 40, 00044 Frascati, Italy
E-mail: [email protected], [email protected], [email protected] Erratum to: JHEP05(2019)213 Abstract: We correct a number of figures in [1], in which the PYTHIA MC result of secondary π 0 mesons was displayed wrongly due to a missing factor of 2. Scrutinizing the corrected data-MC comparsion, we review and model the trigger condition used in the LEBC-EHS experiment, and present an improved data-MC comparison. We review the sensitivity estimates for ALP searches in past and present experiments based on MC distributions scaled to data and find that the main conclusions of the paper remain unchanged. ArXiv ePrint: 1904.02091
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP10(2020)046
JHEP10(2020)046
Erratum: Light in the beam dump. Axion-Like Particle production from decay photons in proton beam-dumps
Figure 2. Left: data-MC comparison for the average transverse momentum as a function of the Feynan XF for a beam momentum of 250 GeV, to replace figure 7 in JHEP 05 (2019) 213. Right: data-MC comparison of the differential cross-section of charged pions produced from 400 GeV protons.
In [1], the differential cross section for inclusive π 0 production in proton-proton in√ teractions is shown as a function the Feynman variable XF = PZ /PZ (max) ∼ 2PZ∗ / s. The evaluation of XF after PYTHIA MC simulation was lacking a factor 2, affecting the display of the results for 250 and 400 GeV beam energy, in the right panel of figure 6 and in figure 3 of [1], respectively. After correcting for this mistake, the new distributions are shown in figure 1. Contrary to the distribution shown in [1] the MC now populates XF up to large values and a segmentation of the variable at high XF to quantify the data-vs-MC agreement as done in table 1 of [1] seems inappropriate. The agreement with the data is better for 250 GeV protons from the NA22 experiment [2] than for 400 GeV protons from the LEBC-EHS experiment [3]. The correlation between average transverse momentum and XF in the left panel of figure 2 shows a good agreement between data and MC at 250 GeV, too.
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JHEP10(2020)046
Figure 1. Data-MC comparison of the differential cross-section of neutral pions and eta mesons produced from 400 GeV (250 GeV) protons, to replace figure 3 (the right panel of figure 6) in JHEP 05 (2019) 213.
At 400 GeV beam energy, the PYTHIA predicted yield is higher than the data especially at large XF . To further scrutinize this issue, we first present the same comparison for charged pions at 400 GeV beam energy: as shown in the right panel of figure 2, the data-MC comparison is significantly b
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