Telescope Array search for EeV photons

Abstract

Rubtsov a on behalf of the Telescope Array Collaboration †

Constraining ultra-high-energy cosmic ray composition through cross-correlations

“…More precisely, we know that these UHECRs are charged nuclei -neutral particles can make up only a marginal fraction of the detected UHECR flux at the highest energies (see e.g. [3]) -but direct measurements of the UHECR atomic number(s) Z (i.e., their chemical composition) are, to this day, inconclusive [2,4,5]. This is because these measurements are prone to systematics (e.g.…”

“…This approach is of course not new, and was most recently discussed in [15][16][17]. 3 Our contribution here is to focus on a set of test statistics (TS) that are derived from the harmonic decomposition of the UHECR flux across sky directions n as Φ…”

Testing super heavy dark matter from primordial black holes with gravitational waves

“…The most stringent constraints come from the non-detection of ultra-high-energy photons, as they are more numerous than protons and much easier to detect than neutrinos. For the range of masses we are interested in, the most significant result comes from the non-observation of any UHECR, and therefore also photons, at primary energies above E = 10 11.3 GeV at the Pierre Auger Observatory [63], which translates in an upper limit on the integral flux above this energy of Φ exp (E > 10 At lower energies the limits from the Pierre Auger Observatory and the Telescope Array collaboration are similar and approximately two orders of magnitude lower [140,141].…”

Constraining ultra-high-energy cosmic ray composition through cross-correlations

“…More precisely, we know that these UHECRs are charged nuclei-neutral particles can make up only a marginal fraction of the detected UHECR flux at the highest energies (see e.g. [3])-but direct measurements of the UHECR atomic number(s) Z (i.e., their chemical composition) are, to this day, inconclusive [2,4,5]. This is because these measurements are prone to systematics (e.g.…”

“…This approach is of course not new, and was most recently discussed in [13][14][15]. 3 Our contribution here is to focus on a set of test statistics (TS) that are derived from the harmonic decomposition of the UHECR flux across sky directions n as…”