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A major new release of the Monte Carlo event generator Herwig++ (version 3.0) is now available. This release marks the end of distinguishing Herwig++ and HERWIG development and therefore constitutes the first major release of version 7 of…

The NEUT event generator is a widely-used tool to simulate neutrino interactions for energies between 10s of MeV and a few TeV. NEUT plays a crucial role in neutrino oscillation analyses for the T2K and Hyper-K experiments, providing the…

高能物理 - 实验 · 物理学 2023-01-24 S. Dolan , J. McElwee , S. Bolognesi , Y. Hayato , K. McFarland , G. Megias , K. Niewczas , L. Pickering , J. Sobczyk , L. Thompson , C. Wret

In this report, we present qualitative analysis of Monte Carlo (MC) dropout method for measuring model uncertainty in neural network (NN) models. We first consider the sources of uncertainty in NNs, and briefly review Bayesian Neural…

机器学习 · 统计学 2020-07-06 Ronald Seoh

Nuclear effects in neutrino-nucleus reactions simulated by means of the NUX+FLUKA Monte Carlo generator are compared with the theoretical predictions of the Marteau model. Pion absorption in NUX+FLUKA and non-pionic Delta decays in the…

核理论 · 物理学 2009-11-10 Jaroslaw A. Nowak , Cezary Juszczak , Jan T. Sobczyk

The modelling of multiple parton interactions in Monte Carlo event generators is a crucial part not only for the dressing of signal processes but also to describe data with a minimum bias on the event selection. Much work has and will be…

高能物理 - 唯象学 · 物理学 2020-06-24 Johannes Bellm , Stefan Gieseke , Patrick Kirchgaesser

We study a phenomenological ansatz for merging next-to-next-to-leading order (NNLO) calculations with Monte Carlo event generators. We reweight them to match bin-integrated NNLO differential distributions. To test this procedure, we study…

In neutrino oscillation experiments, neutrino interactions at the detector are simulated using event generators which attempt to reflect our understanding of nuclear physics. We study the impact of different neutrino interactions and…

高能物理 - 唯象学 · 物理学 2014-04-23 Pilar Coloma , Patrick Huber , Chun-Min Jen , Camillo Mariani

The three-nucleon (NNN) interaction derived within the chiral effective field theory at the next-to-next-to-leading order (N2LO) is regulated with a function depending on the magnitude of the momentum transfer. The regulated NNN interaction…

核理论 · 物理学 2008-11-26 Petr Navratil

Chiral effective field theory (EFT) enables a systematic description of low-energy hadronic interactions with controlled theoretical uncertainties. For strongly interacting systems, quantum Monte Carlo (QMC) methods provide some of the most…

核理论 · 物理学 2016-02-04 I. Tews , S. Gandolfi , A. Gezerlis , A. Schwenk

Physics and programming aspects are discussed for a Fortran 77 Monte Carlo program to simulate complete events in deep inelastic lepton-nucleon scattering. The parton level interaction is based on the standard model electroweak cross…

高能物理 - 唯象学 · 物理学 2009-10-28 G. Ingelman , A. Edin , J. Rathsman

Quantum Monte Carlo methods find fruitful application in large shell model problems. These methods reduce the imaginary-time many-body evolution operator to a coherent superposition of one-body evolutions in a fluctuating one-body field;…

核理论 · 物理学 2008-02-03 S. E. Koonin

The MiniBooNE large axial mass anomaly has prompted a great deal of theoretical work on sophisticated Charged Current Quasi-Elastic (CCQE) neutrino interaction models in recent years. As the dominant interaction mode at T2K energies, and…

We present detailed results for the model-independent low momentum nucleon-nucleon interaction V_{low k}. By introducing a cutoff in momentum space, we separate the Hilbert space into a low momentum and a high momentum part. The…

核理论 · 物理学 2008-11-26 S. K. Bogner , T. T. S. Kuo , A. Schwenk

Background. Knockout reactions with proton targets provide an invaluable tool to access the properties of two-neutron halo nuclei. Recently, experimental results for the average opening angle as a function of the intrinsic neutron momentum…

核理论 · 物理学 2021-09-01 J. Casal , M. Gómez-Ramos

We construct an effective shell-model interaction for the valence space spanned by single-particle neutron and single-hole proton states in $^{100}$Sn. Starting from chiral nucleon-nucleon and three-nucleon forces and single-reference…

核理论 · 物理学 2021-12-16 Z. H. Sun , G. Hagen , G. R. Jansen , T. Papenbrock

Benchmark comparisons between many-body methods are performed to assess the ingredients necessary for an accurate calculation of neutrinoless double beta decay matrix elements. Shell model and variational Monte Carlo (VMC) calculations are…

核理论 · 物理学 2019-10-15 X. B. Wang , A. C. Hayes , J. Carlson , G. X. Dong , E. Mereghetti , S. Pastore , R. B. Wiringa

The Paschos-Wolfenstein (PW) relation joins neutral- and charged-current neutrino- and antineutrino-induced cross sections into an expression that depends on the weak mixing angle $\sin^2 \theta_W$. Contrary to the traditional approach with…

核理论 · 物理学 2008-11-26 C. Praet , N. Jachowicz , J. Ryckebusch , P. Vancraeyveld , K. Vantournhout

The reduced cross section of the semiexclusive $(l,l'p)$ lepton scat tering process irrespective of the type of interaction is determined mainly by bound nucleon momentum distribution in target and nucleon final state interaction with…

高能物理 - 唯象学 · 物理学 2026-03-26 A. V. Butkevich , S. V. Luchuk

With the advent and recent extension of the BLHA standard to interface Monte Carlo event generators and one-loop matrix element providers, the Herwig++ event generator has expanded its range of applicability to a multitude of underlying…

We have extended our model for charged current neutrino-nucleus interactions to neutral current reactions. For the elementary neutrino-nucleon interaction, we take into account quasielastic scattering, Delta excitation and the excitation of…

核理论 · 物理学 2008-11-26 T. Leitner , L. Alvarez-Ruso , U. Mosel