scholarly journals Monte Carlo event generator with model-independent new physics effects for B → K(*)የየ decays

2020 ◽  
Vol 245 ◽  
pp. 06030
Author(s):  
Koji Hara ◽  
Ryosuke Itoh ◽  
Hideki Miyake ◽  
Satoshi Mishima
Keyword(s):  
Monte Carlo ◽  
New Physics ◽  
Monte Carlo Event ◽  
Event Generator ◽  
High Luminosity ◽  
The Standard Model ◽  
Model Independent ◽  
Belle Ii ◽  
Detector Simulation ◽  
Kinematic Distribution

At high luminosity flavor factory experiments such as Belle II, global analyses with many observables are important to find new physics. Because the observables obtained by assuming the Standard Model could be changed by new physics effects in the kinematic distribution, such effects must be estimated with the detector simulation. We develop the event generator of B → K*ll decays including new physics effects in the model-independent way by parametrizing with the Wilson coefficients based on the EvtGen and EOS. An example of the kinematic distribution is shown, including possible new physics effects in Wilson coefficients.

scholarly journals Long-lived heavy neutral leptons at the LHC: four-fermion single-NR operators

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
Rebeca Beltrán ◽  
Giovanna Cottin ◽  
Juan Carlos Helo ◽  
Martin Hirsch ◽  
Arsenii Titov ◽  
...  
Keyword(s):  
Field Theory ◽  
Standard Model ◽  
Effective Field Theory ◽  
New Physics ◽  
Effective Field ◽  
High Luminosity ◽  
The Past ◽  
The Standard Model ◽  
Model Independent

Abstract Interest in searches for heavy neutral leptons (HNLs) at the LHC has increased considerably in the past few years. In the minimal scenario, HNLs are produced and decay via their mixing with active neutrinos in the Standard Model (SM) spectrum. However, many SM extensions with HNLs have been discussed in the literature, which sometimes change expectations for LHC sensitivities drastically. In the NRSMEFT, one extends the SM effective field theory with operators including SM singlet fermions, which allows to study HNL phenomenology in a “model independent” way. In this paper, we study the sensitivity of ATLAS to HNLs in the NRSMEFT for four-fermion operators with a single HNL. These operators might dominate both production and decay of HNLs, and we find that new physics scales in excess of 20 TeV could be probed at the high-luminosity LHC.

scholarly journals Challenges in Monte Carlo Event Generator Software for High-Luminosity LHC

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Andrea Valassi ◽  
◽  
Efe Yazgan ◽  
Josh McFayden ◽  
Simone Amoroso ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Working Group ◽  
Monte Carlo Event ◽  
Event Generator ◽  
High Luminosity ◽  
Monte Carlo Event Generator ◽  
Lhc Physics ◽  
Physics Programme

AbstractWe review the main software and computing challenges for the Monte Carlo physics event generators used by the LHC experiments, in view of the High-Luminosity LHC (HL-LHC) physics programme. This paper has been prepared by the HEP Software Foundation (HSF) Physics Event Generator Working Group as an input to the LHCC review of HL-LHC computing, which has started in May 2020.

scholarly journals Disentangling QCD and new physics in D → πℓ+ℓ−

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Aoife Bharucha ◽  
Diogo Boito ◽  
Cédric Méaux
Keyword(s):  
Standard Model ◽  
Branching Ratio ◽  
Branching Ratios ◽  
New Physics ◽  
Operator Product ◽  
Beyond The Standard Model ◽  
Spectral Functions ◽  
The Standard Model ◽  
Model Independent ◽  
Weak Annihilation

Abstract In this paper we consider the decay D+ → π+ℓ+ℓ−, addressing in particular the resonance contributions as well as the relatively large contributions from the weak annihilation diagrams. For the weak annihilation diagrams we include known results from QCD factorisation at low q2 and at high q2, adapting the existing calculation for B decays in the Operator Product Expansion. The hadronic resonance contributions are obtained through a dispersion relation, modelling the spectral functions as towers of Regge-like resonances in each channel, as suggested by Shifman, imposing the partonic behaviour in the deep Euclidean. The parameters of the model are extracted using e+e− → (hadrons) and τ → (hadrons) + ντ data as well as the branching ratios for the resonant decays D+ → π+R(R → ℓ+ℓ−), with R = ρ, ω, and ϕ. We perform a thorough error analysis, and present our results for the Standard Model differential branching ratio as a function of q2. Focusing then on the observables FH and AFB, we consider the sensitivity of this channel to effects of physics beyond the Standard Model, both in a model independent way and for the case of leptoquarks.

SEARCH FOR NEW PHYSICS IN eμX DATA AT THE TEVATRON USING SLEUTH: A QUASI-MODEL-INDEPENDENT SEARCH STRATEGY FOR NEW PHYSICS

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 888-890
Author(s):  
◽  
BRUCE KNUTESON
Keyword(s):  
Standard Model ◽  
Search Strategy ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Final States ◽  
Final State ◽  
The Standard Model ◽  
Model Independent

We present a quasi-model-independent search for physics beyond the standard model. We define final states to be studied, and construct a rule that identifies a set of variables appropriate for any particular final state. A new algorithm ("Sleuth") searches for regions of excess in the space of those variables and quantifies the significance of any detected excess. After demonstrating the sensititvity of the method, we apply it to the semi-inclusive channel eμX collected in ≈108 pb -1 of [Formula: see text] collisions at [Formula: see text] at the DØ experiment at the Fermilab Tevatron. We find no evidence of new high pT physics in this sample.

kronos: A Monte Carlo event generator for higher order QED corrections at HERA — Status report

1992 ◽  
Vol 29 (1) ◽  
pp. 247-252
Author(s):  
Harald Anlauf ◽  
Panagiotis Manakos ◽  
Thomas Mannel ◽  
Hans D. Dahmen ◽  
Thorsten Ohl
Keyword(s):  
Monte Carlo ◽  
Higher Order ◽  
Monte Carlo Event ◽  
Status Report ◽  
Event Generator ◽  
Monte Carlo Event Generator

scholarly journals Investigation of the influence of nuclear matter on hard neutrino nucleus interaction using the HARDPING Monte Carlo Event Generator

2016 ◽  
Vol 125 ◽  
pp. 04021
Author(s):  
Ya.A. Berdnikov ◽  
A.Ya. Berdnikov ◽  
V.T. Kim ◽  
A.E. Ivanov ◽  
D.P. Suetin ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Nuclear Matter ◽  
Monte Carlo Event ◽  
Event Generator ◽  
Nucleus Interaction ◽  
Monte Carlo Event Generator

scholarly journals Non-standard interactions in SMEFT confronted with terrestrial neutrino experiments

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Yong Du ◽  
Hao-Lin Li ◽  
Jian Tang ◽  
Sampsa Vihonen ◽  
Jiang-Hao Yu
Keyword(s):  
Neutrino Oscillation ◽  
New Physics ◽  
Effective Field ◽  
Scalar Leptoquark ◽  
Double Chooz ◽  
The Standard Model ◽  
Reactor Neutrino ◽  
Model Independent ◽  
Neutrino Experiments ◽  
Individual Dimension

Abstract The Standard Model Effective Field Theory (SMEFT) provides a systematic and model-independent framework to study neutrino non-standard interactions (NSIs). We study the constraining power of the on-going neutrino oscillation experiments T2K, NOνA, Daya Bay, Double Chooz and RENO in the SMEFT framework. A full consideration of matching is provided between different effective field theories and the renormalization group running at different scales, filling the gap between the low-energy neutrino oscillation experiments and SMEFT at the UV scale. We first illustrate our method with a top- down approach in a simplified scalar leptoquark model, showing more stringent constraints from the neutrino oscillation experiments compared to collider studies. We then provide a bottom-up study on individual dimension-6 SMEFT operators and find NSIs in neutrino experiments already sensitive to new physics at ∼20 TeV when the Wilson coefficients are fixed at unity. We also investigate the correlation among multiple operators at the UV scale and find it could change the constraints on SMEFT operators by several orders of magnitude compared with when only one operator is considered. Furthermore, we find that accelerator and reactor neutrino experiments are sensitive to different SMEFT operators, which highlights the complementarity of the two experiment types.

scholarly journals Spacetime colour reconnection in Herwig 7

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
Johannes Bellm ◽  
Cody B Duncan ◽  
Stefan Gieseke ◽  
Miroslav Myska ◽  
Andrzej Siódmok
Keyword(s):  
Monte Carlo ◽  
Reasonable Agreement ◽  
Distance Measure ◽  
Monte Carlo Event ◽  
Event Generator ◽  
Monte Carlo Event Generator ◽  
Colour Reconnection ◽  
Invariant Distance

AbstractWe present a model for generating spacetime coordinates in the Monte Carlo event generator Herwig 7, and perform colour reconnection by minimizing a boost-invariant distance measure of the system. We compare the model to a series of soft physics observables. We find reasonable agreement with the data, suggesting that pp-collider colour reconnection may be able to be applied in larger systems.

scholarly journals The Belle II Experiment at the SuperKEKB

2019 ◽  
Vol 218 ◽  
pp. 07003
Author(s):  
Chang-Zheng Yuan
Keyword(s):  
Standard Model ◽  
Precision Measurement ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Heavy Flavor ◽  
High Precision Measurement ◽  
The Standard Model ◽  
The Status ◽  
Belle Ii ◽  
Belle Experiment

Belle II experiment at the SuperKEKB collider is a major upgrade of the Belle experiment at the KEKB asymmetric e+e− collider at the KEK. The experiment will focus on the search for new physics beyond the standard model via high precision measurement of heavy flavor decays and search for rare signals. In this talk, we present the status of the SuperKEKB collider and the Belle II detector.

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