Abstract Young core-collapse supernovae (YSNe) are factories of high-energy neutrinos and gamma-rays as the shock accelerated protons efficiently interact with in dense circumstellar medium. We explore detection prospects secondary particles from YSNe Type IIn, II-P, IIb/II-L, Ib/c. IIn found to produce largest flux gamma-rays, followed by II-P YSNe. Fermi-LAT Cherenkov Telescope Array (IceCube-Gen2) have potential detect up 10 Mpc (4 Mpc), remaining Types being detectable closer Earth. also...

Abstract The recent supernova, SN 2023ixf, one of the closest observed type II SNe has revealed presence a dense circumstellar material (CSM). Interaction ejecta with this CSM might create high energy protons PeV energies through shock acceleration. These accelerated then colliding (inelastic pp collision) can produce secondaries such as gamma-rays and neutrinos. However, no neutrinos have been detected by Fermi-LAT IceCube from event. placed an upper limit on gamma-ray flux above 100 MeV to...

Amaterasu, the second most energetic (244 EeV) cosmic ray particle has been recently detected by Telescope Array (TA) surface detector. The origin of TA Amaterasu event is puzzling, as its arrival direction points back to a void in local Universe, lacking conventional astrophysical ultrahigh-energy (UHE) sources. Hence, we explore possibility if this could have originated from decay superheavy dark matter (SHDM) Milky Way. Such an also opens up multimessenger detection channels both UHE...

Recently, Large High Altitude Air Shower Observatory (LHAASO) has detected several Galactic point sources of ultra high energy (UHE; $E_{\gamma}> 100$ TeV) gamma-rays. These gamma-rays are possibly created in leptonic or hadronic interactions cosmic rays (CRs) PeV energies. In the channel ($p-p$ interaction), accompanied by neutrinos. The detection neutrinos is therefore crucial understanding CR acceleration such objects. To estimate neutrino flux, we adopt two LHAASO (J2226+6057,...

Observations of some supernovae (SNe), such as SN 2014C, in the x-ray and radio wavebands revealed a rebrightening over timescale about year since their detection. Such discovery hints towards evolution hydrogen-poor type Ib/Ic into hydrogen-rich IIn, late time activity being attributed to interaction ejecta with dense circumstellar medium (CSM) far away from stellar core. We compute neutrino $\ensuremath{\gamma}$-ray emission these SNe, considering interactions between shock accelerated...

Abstract The recent IceCube detection of significant neutrino flux from the inner Galactic plane has provided us valuable insights on spectrum cosmic rays in our Galaxy. This can be produced either by a population point sources or diffused emission ray interactions with interstellar medium mixture both. In this work, we compute gamma-ray and fluxes giant molecular clouds (GMCs) Galaxy, assuming different parametrizations distribution. particular, take into account two main cases: (I)...

The recent supernova, SN 2023ixf, one of the closest observed type II SNe has revealed presence a dense circumstellar material (CSM). Interaction ejecta with this CSM might create high energy protons PeV energies through shock acceleration. These accelerated then colliding (inelastic $pp$ collision) can produce secondaries such as gamma-rays and neutrinos. However, no neutrinos have been detected by Fermi-LAT IceCube from event. placed an upper limit on gamma-ray flux above $100$~MeV to be...

Observations of some supernovae (SNe), such as SN 2014C, in the X-ray and radio wavebands revealed a rebrightening over timescale about year since their detection. Such discovery hints towards evolution hydrogen-poor Type Ib/c into hydrogen-rich IIn, late time activity being attributed to interaction ejecta with dense circumstellar medium (CSM) far away from stellar core. We compute neutrino gamma-ray emission these SNe, considering interactions between shock accelerated protons...

The recent detection of significant neutrino flux from the inner Galactic plane by IceCube detector has provided us valuable insights on spectrum cosmic rays in our Galaxy. This can be produced either a population point sources or diffused emission ray interactions with interstellar medium mixture both. In this work, we compute gamma-ray and fluxes giant molecular clouds (GMCs) Galaxy, assuming different parametrizations distribution. particular, take into account two main cases: (I)...

Abstract Ultra-high energy cosmic rays (UHECRs) beyond the Greisen-Zatsepin-Kuzmin (GZK) cut-off provide us with a unique opportunity to understand universe at extreme energies. Secondary GZK photons and neutrinos associated same interaction are indeed interconnected render access multi-messenger analysis of UHECRs. The photon flux is heavily attenuated due Cosmic Microwave Background (CMB) Extra-galactic Radio (ERB). present estimate ERB comprising several model uncertainties together...

The consistent combination of Next-to-Leading-Order (NLO) perturbative QCD with the logarithmic resummation parton shower algorithms ('NLO matching') is a workhorse precision in LHC era.Two methods for achieving this have been widely adopted: Mc@Nlo and Powheg.The differences between them are formally Next-to-Nextto-Leading-Order (NNLO) therefore irrelevant NLO accuracy, but nevertheless numerically significant certain processes observables.We summarise third method, KrkNLO, present...

Amaterasu, the second most energetic ($244$ EeV) cosmic ray particle has been recently detected by Telescope Array (TA) surface detector. The origin of TA Amaterasu event is puzzling, as its arrival direction points back to a void in local Universe, lacking conventional astrophysical ultra-high-energy (UHE) (CR) sources. Hence, we explore possibility if this could have originated from decay superheavy dark matter (SHDM) Milky Way. Such an also opens up multi-messenger detection channels both...

Matched calculations combining perturbative QCD with parton showers are an indispensable tool for LHC physics. Two methods NLO matching in widespread use: MC@NLO and POWHEG. We describe alternative, KrkNLO, reformulated to be easily applicable any colour-singlet process. The primary distinguishing characteristic of KrkNLO is its use alternative factorisation scheme, the 'Krk' achieve accuracy. general implementation Herwig 7, using diphoton production as a test systematically compare...

Recently, Large High Altitude Air Shower Observatory (LHAASO) has detected several Galactic point sources of ultra high energy (UHE; $E_γ> 100$ TeV) gamma-rays. These gamma-rays are possibly created in leptonic or hadronic interactions cosmic rays (CRs) PeV energies. In the channel ($p-p$ interaction), accompanied by neutrinos. The detection neutrinos is therefore crucial understanding CR acceleration such objects. To estimate neutrino flux, we adopt two LHAASO (J2226+6057, J1908+0621)...

Ultra-high energy cosmic rays (UHECRs) beyond the Greisen-Zatsepin-Kuzmin (GZK) cut-off provide us with a unique opportunity to understand universe at extreme energies. Secondary GZK photons and neutrinos associated same interaction are indeed interconnected render access multi-messenger analysis of UHECRs. The photon flux is heavily attenuated due Cosmic Microwave Background (CMB) Extra-galactic Radio (ERB). present estimate ERB comprising several model uncertainties together ARCADE2 radio...