yaslha's Introduction

yaslha: Yet Another SLHA module for Python3

A Python3 package to manipulate SLHA files and convert them to other file formats (JSON and YAML).

Quick Start

(TBW)

Introduction

The SUSY Les Houches Accord is a data format widely used in particle physics phenomenology. It is originally defined in arXiv:hep-ph/0311123 and extended to SLHA2 in arXiv:0801.0045.

Because of its birth in FORTRAN era it is a fixed length format such as

BLOCK SMINPUTS                  # Standard Model input parameters
     1     1.27934000e+02   # alpha_em^-1(M_Z)^MSbar
     2     1.16637000e-05   # G_F [GeV^-2]
     3     1.17200000e-01   # alpha_S(M_Z)^MSbar
     4     9.11876000e+01   # mZ (pole)
     5     4.18000000e+00   # mb(mb)^MSbar
     6     1.73300000e+02   # mt (pole)
     7     1.77682000e+00   # mtau (pole)
#
BLOCK ALPHA                    #
          -2.68630018e-02   # Higgs mixing parameter
#
BLOCK HMIX Q= 2.00000000e+02   # Higgs parameters (DRbar)
     1     5.40000000e+02   # mu(Q)
     2     4.00000000e+01   # tanbeta(Q)
     3     2.46220569e+02   # vev(Q)
     4     2.30400000e+05   # mA^2(Q)
#
...

and extended in many program codes.

Python has two famous SLHA parser: PySLHA by Andy Buckley and pylha by David M. Straub. yaslha is "yet another" SLHA parser, influenced much by these two parsers.

Python regrettably experienced a terrible era due to the transition from Python2 to Python3. To reduce code complexity, this package supports only Python3.4 and later versions.

Usage

(TBW)

Author

Sho Iwamoto / Misho, under much influence from PySLHA by Andy Buckley and pylha by David M. Straub.

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yaslha's Issues

Needs unittests

Error due to an invalid SDECAY output

The invalid output from SDECAY

BLOCK GAUGE Q=  2.00000000E+02  # The gauge couplings
     1     3.58003249E-01   # gprime(Q) DRbar
     2     6.48434966E-01   # g(Q) DRbar
    3   # g3(Q) DRbar depends on the scale Q = mass of the decaying particle

causes

  File "yaslha/core.py", line 28, in dump
    return dumper.dump(self)
  File "yaslha/dumper.py", line 137, in dump
    for block in self._blocks_sorted(slha)]
  File "yaslha/dumper.py", line 137, in <listcomp>
    for block in self._blocks_sorted(slha)]
  File "yaslha/dumper.py", line 172, in dump_block
    body, key_order = self._block_lines_with_key_order(block)
  File "yaslha/dumper.py", line 85, in _block_lines_with_key_order
    keys.sort()
TypeError: '<' not supported between instances of 'NoneType' and 'int'

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