The Alpha Magnetic Spectrometer (AMS) on the International Space Station: Part I – results from the test flight on the space shuttle

“…Also shown is the e + /(e + + e − ) spectrum for the benchmark model (red curve). Although we only fit to data from PAMELA [4] we include also data from HEAT [93,94], AMS01 [95], and CAPRICE94 [96], for comparison. small window of N e values yield a good fit to both data sets.…”

Section: Jhep01(2011)064mentioning

confidence: 99%

“…The DM contribution is seen to produce a sizeable excess. Data shown are from the PAMELA [4], HEAT [93,94], AMS01 [95], and CAPRICE94 [96] collaborations.…”

Section: Jhep01(2011)064mentioning

confidence: 99%

Cosmic ray anomalies from the MSSM?

Cotta

Conley

Gainer

et al. 2011

J. High Energ. Phys.

View full text Add to dashboard Cite

Abstract:The recent positron excess in cosmic rays (CR) observed by the PAMELA satellite may be a signal for dark matter (DM) annihilation. When these measurements are combined with those from FERMI on the total (e + + e − ) flux and from PAMELA itself on thep/p ratio, these and other results are difficult to reconcile with traditional models of DM, including the conventional mSUGRA version of Supersymmetry even if boosts as large as 10 3−4 are allowed. In this paper, we combine the results of a previously obtained scan over a more general 19-parameter subspace of the MSSM with a corresponding scan over astrophysical parameters that describe the propagation of CR. We then ascertain whether or not a good fit to this CR data can be obtained with relatively small boost factors while simultaneously satisfying the additional constraints arising from gamma ray data. We find that a specific subclass of MSSM models where the LSP is mostly pure bino and annihilates almost exclusively into τ pairs comes very close to satisfying these requirements. The lightestτ in this set of models is found to be relatively close in mass to the LSP and is in some cases the nLSP. These models lead to a significant improvement in the overall fit to the data by an amount ∆χ 2 ∼ 1/dof in comparison to the best fit without Supersymmetry while employing boosts ∼ 100. The implications of these models for future experiments are discussed.

show abstract

“…The deuteron contribution decreases with rigidity; at 1 GV it is less than 2% and at 20 GV it is 0.6% [23,24]. Deuterons were not removed.…”

Section: Selectionmentioning

confidence: 99%

Precision measurement of the proton and helium flux in primary cosmic rays with the Alpha Magnetic Spectrometer on the International Space Station

Heil

2016

EPJ Web Conf.

View full text Add to dashboard Cite

Abstract. The precise measurements of the proton and helium flux in primary cosmic rays based on on data collected by the Alpha Magnetic Spectrometer during the first 30 months of operation (May 19, 2012 to November 26, 2013 onboard the International Space Station are presented. Knowledge of the rigidity dependence of the proton and helium flux is important in understanding the origin, acceleration, and propagation of cosmic rays in our galaxy. The high statistics of the measurements (300 mio. protons, 50 mio. helium) allow to study the detailed variations with rigidity of the fluxes spectral index. The spectral index of both the proton and the helium flux progressively hardens at rigidities larger than 100 GV. The rigidity dependence of the helium flux spectral index is similar to that of the proton spectral index though the magnitudes are different. Remarkably, the spectral index of the proton to helium flux ratio increases with rigidity up to 45 GV and then becomes constant; the flux ratio above 45 GV is well described by a single power law.

show abstract

The Alpha Magnetic Spectrometer (AMS) on the International Space Station: Part I – results from the test flight on the space shuttle

Cited by 396 publications

References 129 publications

Precision Measurement of the Proton Flux in Primary Cosmic Rays from 1 GV to 1.8 TV with the Alpha Magnetic Spectrometer on the International Space Station

Precision Measurement of the Proton Flux in Primary Cosmic Rays from 1 GV to 1.8 TV with the Alpha Magnetic Spectrometer on the International Space Station

Cosmic ray anomalies from the MSSM?

Precision measurement of the proton and helium flux in primary cosmic rays with the Alpha Magnetic Spectrometer on the International Space Station

Contact Info

Product

Resources

About