READ ME File For 'Dataset_BsInclusiveDecays.tar.gz'

Dataset DOI: https://doi.org/10.5258/SOTON/D2798

AUTHOR: Alessandro Barone, University of Southampton
ORCID ID: 0000-0002-0036-2517

This dataset supports the thesis entitled "Inclusive semileptonic B(s)-meson decays from Lattice QCD"
AWARDED BY: Univeristy of Southampton
DATE OF AWARD: 2023

RELATED PUBLICATION:
https://link.springer.com/article/10.1007/JHEP07(2023)145

DATE OF CREATION:
September 2021

DESCRIPTION OF THE DATA

The dataset contains data corresponding to the two-point, three-point and four-point correlation functions (correlators)
necessary to study the semileptonic decays of Bs mesons in Lattice QCD.
The data are generated trhough numerical simulations on a 24^3 X 64 Lattice using the ensemble configuration provided by the RBC/UKQCD collaboration and have
been used in the work published in [https://link.springer.com/article/10.1007/JHEP07(2023)145], which provide a summary of the simulation details.
The thesis provide more details as follows. A generic introduction to Lattice QCD is provided in Chapter 2 of the thesis.
The  operators necessary to build the correlation functions for the process considered are discussed in Chapter 4.
The details of the actual simulation are listed in Chapter 5.
The data have been generated with the Grid (https://github.com/paboyle/Grid) and Hadrons (https://github.com/aportelli/Hadrons)
software packages using the DiRAC Extreme Scaling service at the University of Edinburgh,
operated by the Edinburgh Parallel Computing Centre on behalf of the STFC DiRAC HPC Facility (www.dirac.ac.uk).


THIS DATASET CONTAINS:

The data are stored in HDF5 format (https://www.hdfgroup.org/solutions/hdf5/).
These can be viewed using the standard HDF5 command-line tools such as h5dump,
or opened with reader libraries, such as the h5py Python library. 
Using the jargon of Lattice QCD (see Chapter 3) each file contains a collection of the data at different sources
tsrc={8,16,24,32,40,48,56}, which are enclosed "Dataset" in the given HDF5 file. 
To inspect the structure of the file simply run from a unix terminal

$ h5ls -r <file>

The 3-momentum "p" is induced with twisted boundary conditions and is given by p=2pi/L (x,x,x), where "x" is the twist.
The twist, labelled by "tw", is indicated in the file name with the structure "x_x_x_0.0".
If nothing is specified, the momentum is zero.

The two-point functions, labelled with "2pt", (for Bs and Ds mesons) have been generated with different smearing, indicated by the notation
"XY" in the file name, X,Y \in {"L", "S"}, where "L" stands for "Local" and "S" stands for "Smeared".
Y refers to the smearing at the source, whereas X refers to the smearing at the sink.

The three-point correlators files, labelled by "3pt", (for the processes Bs->Ds, Bs->Bs, Ds->Ds) and four-point correlators files, labelled by "4pt",
contain all the Gammas combinations as "Groups", further divided into "Datasets" for different sources, as explained above.