New physics from ultrahigh energy cosmic rays

Illana, J. I.; Masip, M.; Meloni, Davide

doi:10.1103/physrevd.75.055002

Cited by 15 publications

(23 citation statements)

References 47 publications

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“…To evaluate the production rate of stau pairs by cosmic rays we need the total flux of hadrons: primary plus secondary nucleons, pions and kaons produced at any depth in the atmosphere and with enough energy to create staus in the collision with an air nucleon. This analysis has been carried out in [14] assuming a flux of primary nucleons dΦ N dE ≈ 1.8…”

Section: Production Of Stau Pairsmentioning

confidence: 99%

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Long-lived staus from cosmic rays

Ahlers

Illana

Masip

et al. 2007

J. Cosmol. Astropart. Phys.

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The collision of a high energy cosmic ray with a nucleon in the upper atmosphere could produce long-lived heavy particles. Such particles would be very penetrating, since the energy loss in matter scales as the inverse mass, and could reach a neutrino telescope like IceCube from large zenith angles. Here we study this possibility and focus on the long-lived stau of SUSY models with a gravitino LSP. The signal would be a pair of muon-like parallel tracks separated by 50 meters along the detector. We evaluate the background of muon pairs and show that any events from zenith angles above 80 • could be explained by the production of these heavy particles by cosmic rays.

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Section: Production Of Stau Pairsmentioning

confidence: 99%

“…The possibility to observe quasi-stable gluinos in IceCube [13] has been considered in [14,15] in the framework of split-SUSY models with very heavy sfermions [16]. Here we will focus on non-colored particles, which present some remarkable differences with the gluinos.…”

Section: Introductionmentioning

confidence: 99%

Long-lived staus from cosmic rays

Ahlers

Illana

Masip

et al. 2007

J. Cosmol. Astropart. Phys.

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“…Hence there is a strong motivation for phenomenological studies, including implications for collider-based measurements [15][16][17], electric dipole moments [18], Higgs physics and electroweak symmetry breaking [19], and cosmic ray physics [16,20,21]. The latter is the main focus of the present study.…”

Section: Introductionmentioning

confidence: 94%

Hunting long-lived gluinos at the Pierre Auger Observatory

et al. 2008

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Eventual signals of split supersymmetry in cosmic ray physics are analyzed in detail. The study focuses particularly on quasistable colorless R-hadrons originating from confinement of long-lived gluinos (with quarks, antiquarks, and gluons) produced in pp collisions at astrophysical sources. Because of parton density requirements, the gluino has a momentum which is considerably smaller than the energy of the primary proton, and so production of heavy (mass 500 GeV) R-hadrons requires powerful cosmic ray engines able to accelerate particles up to extreme energies, somewhat above 10 13:6 GeV. Using a realistic Monte Carlo simulation with the AIRES engine, we study the main characteristics of the air showers triggered when one of these exotic hadrons impinges on a stationary nucleon of the Earth's atmosphere. We show that R-hadron air showers present clear differences with respect to those initiated by standard particles. We use these shower characteristics to construct observables which may be used to distinguish long-lived gluinos at the Pierre Auger Observatory.

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“…The influence of secondary hadrons to final LB flux can be included by multiplying an extra O(1) factor. This factor is determined by the flux of secondary hadrons [11]. 2 In fact, the total cross sections of high energy cosmic hadrons are not precisely determined.…”

Section: A the Modelmentioning

confidence: 99%

“…Provided that the time information of muon is precisely recorded, one can identify two signal muons which are supposed to arrive at detector at the same time, not heavily polluted by two irrelevant coincident parallel muon events. In order to suppress the muon backgrounds, the analysis focused on quasi-horizontal events might be important [11,12]. A more optimistic case is that LLP decays inside the detector with an 'obvious' decay vertex.…”

Section: Introductionmentioning

confidence: 99%

Detecting light long-lived particle produced by cosmic ray

Yin

Zhu

2010

Physics Letters B

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We investigate the possibility of detecting light long-lived particle (LLP) produced by high energy cosmic ray colliding with atmosphere. The LLP may penetrate the atmosphere and decay into a pair of muons near/in the neutrino telescope. Such muons can be treated as the detectable signal for neutrino telescope. This study is motivated by recent cosmic electron/positron observations which suggest the existence of O(TeV) dark matter and new light O(GeV) particle. It indicates that dark sector may be complicated, and there may exist more than one light particles, for example the dark gauge boson A ′ and associated dark Higgs boson h ′ . In this work, we discuss the scenario with A ′ heavier than h ′ and h ′ is treated as LLP. Based on our numerical estimation, we find that the large volume neutrino telescope IceCube has the capacity to observe several tens of di-muon events per year for favorable parameters if the decay length of LLP can be comparable with the depth of atmosphere. The challenge here is how to suppress the muon backgrounds induced by cosmic rays and atmospheric neutrinos.

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New physics from ultrahigh energy cosmic rays

Cited by 15 publications

References 47 publications

Long-lived staus from cosmic rays

Long-lived staus from cosmic rays

Hunting long-lived gluinos at the Pierre Auger Observatory

Detecting light long-lived particle produced by cosmic ray

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