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Measurement of the low-energy antideuteron inelastic cross section

The ALICE collaboration
Phys.Rev.Lett. 125 (2020) 162001, 2020.

Abstract
In this Letter, we report the first measurement of the antideuteron inelastic cross section at low particle momenta, covering a range of $0.3 \leq p < 4$ GeV/$c$. The measurement is carried out using p-Pb collisions at a center-of-mass energy per nucleon-nucleon pair of $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV, recorded with the ALICE detector at the CERN LHC and utilizing the detector material as an absorber for antideuterons and antiprotons. The extracted raw primary antiparticle-to-particle ratios are compared to the results from detailed ALICE simulations based on the GEANT4 toolkit for the propagation of antiparticles through the detector material. The analysis of the raw primary (anti)proton spectra serves as a benchmark for this study, since their hadronic interaction cross sections are well constrained experimentally. The first measurement of the antideuteron inelastic cross section averaged over the ALICE detector material with atomic mass numbers $\langle A \rangle$ = 17.4 and 31.8 is obtained. The measured inelastic cross section points to a possible excess with respect to the Glauber model parameterization in the lowest momentum interval of $0.3 \leq p < 0.47$ GeV/$c$ up to a factor 2.1. This result is relevant for the understanding of antimatter propagation and the contributions to antinuclei production from cosmic ray interactions within the interstellar medium. In addition, the momentum range covered by this measurement is of particular importance to evaluate signal predictions for indirect dark-matter searches.

  • Table 1

    Figure 1 (left)

    10.17182/hepdata.96844.v1/t1

    Raw primary antiproton-to-proton ratio as a function of the momentum p_primary.

  • Table 2

    Figure 1 (left)

    10.17182/hepdata.96844.v1/t2

    Raw primary antiproton-to-proton ratio from Geant4-based MC simulations as a function of the momentum p_primary.

  • Table 3

    Figure 1 (right)

    10.17182/hepdata.96844.v1/t3

    Raw primary antideuteron-to-deuteron ratio as a function of the momentum p_primary.

  • Table 4

    Figure 1 (right)

    10.17182/hepdata.96844.v1/t4

    Raw primary antideuteron-to-deuteron ratio from Geant4-based MC simulations as a function of the momentum p_primary.

  • Table 5

    Figure 2

    10.17182/hepdata.96844.v1/t5

    Raw primary antiproton-to-proton ratio from Geant4-based MC simulations as a function of the momentum p_primary with default sigma_inel(pbar).

  • Table 6

    Figure 2

    10.17182/hepdata.96844.v1/t6

    Raw primary antiproton-to-proton ratio from Geant4-based MC simulations as a function of the momentum p_primary with sigma_inel(pbar)x1.25.

  • Table 7

    Figure 2

    10.17182/hepdata.96844.v1/t7

    Raw primary antiproton-to-proton ratio from Geant4-based MC simulations as a function of the momentum p_primary with sigma_inel(pbar)0.75.

  • Table 8

    Figure 2

    10.17182/hepdata.96844.v1/t8

    Raw primary antiproton-to-proton ratio from Geant4-based MC simulations as a function of the momentum p_primary (exp. data).

  • Table 9

    Figure 3 (a)

    10.17182/hepdata.96844.v1/t9

    Inelastic interaction cross section of antiprotons on an averaged material element of the ALICE detector (1 sigma constraints).

  • Table 10

    Figure 3 (a)

    10.17182/hepdata.96844.v1/t10

    Inelastic interaction cross section of antiprotons on an averaged material element of the ALICE detector (2 sigma constraints).

  • Table 11

    Figure 3 (b)

    10.17182/hepdata.96844.v1/t11

    Inelastic interaction cross section of antiprotons on an averaged material element of the ALICE detector (1 sigma constraints).

  • Table 12

    Figure 3 (b)

    10.17182/hepdata.96844.v1/t12

    Inelastic interaction cross section of antiprotons on an averaged material element of the ALICE detector (2 sigma constraints).

  • Table 13

    Figure 3 (c)

    10.17182/hepdata.96844.v1/t13

    Inelastic interaction cross section of antideuterons on an averaged material element of the ALICE detector (1 sigma constraints).

  • Table 14

    Figure 3 (c)

    10.17182/hepdata.96844.v1/t14

    Inelastic interaction cross section of antideuterons on an averaged material element of the ALICE detector (2 sigma constraints).

  • Table 15

    Figure 3 (d)

    10.17182/hepdata.96844.v1/t15

    Inelastic interaction cross section of antideuterons on an averaged material element of the ALICE detector (1 sigma constraints).

  • Table 16

    Figure 3 (d)

    10.17182/hepdata.96844.v1/t16

    Inelastic interaction cross section of antideuterons on an averaged material element of the ALICE detector (2 sigma constraints).

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