|
|
constexpr double | alpha_s_mZ = 0.1184 |
| | Default value for strong coupling at the scale mZ.
|
| |
|
constexpr double | alpha_mZ = 1/128.944 |
| | QED coupling at the scale mZ.
|
| |
|
constexpr double | alpha_Y = 1/132.274 |
| | QED coupling at the scale mu_alpha_Y.
|
| |
|
constexpr double | mu_alpha_Y = 10.2 |
| | Typical scale for Y resonances.
|
| |
|
constexpr double | mZ = 91.1876 |
| | Mass of the Z boson.
|
| |
|
constexpr double | mW = 80.385 |
| | Mass of the W boson.
|
| |
|
constexpr double | me = 0.0005109989461 |
| | Electron mass.
|
| |
|
constexpr double | G_F = 0.000011663787 |
| | Fermi constant - this is exclusively used for calculating the top width.
|
| |
|
constexpr double | m_Higgs = 125. |
| | Default value for mass of the Higgs boson.
|
| |
|
constexpr double | alpha_QED = 1/137.035999074 |
| | Fine structure constant.
|
| |
|
constexpr double | e_u = 2./3. |
| | Electric charge of the top quark in units of the positron charge.
|
| |
|
constexpr double | e_d = -1./3. |
| | Electric charge of the bottom quark in units of the positron charge.
|
| |
|
constexpr double | e = -1 |
| | Electric charge of the electron in units of the positron charge.
|
| |
|
constexpr double | cw2 = mW*mW/(mZ*mZ) |
| | cosine of the weak mixing angle squared
|
| |
|
constexpr double | sw2 = 1 - cw2 |
| | sine of the weak mixing angle squared
|
| |
|
constexpr double | T3_nu = 1./2. |
| | Weak isospin of neutrino.
|
| |
|
constexpr double | T3_e = -1./2. |
| | Weak isospin of electron.
|
| |
|
constexpr double | T3_u = 1./2. |
| | Weak isospin of top.
|
| |
|
constexpr double | T3_d = -1./2. |
| | Weak isospin of bottom.
|
| |
|
constexpr double | mb_SI = 4.203 |
| | Reference scale-invariant mass for bottom quarks.
|
| |
|
constexpr double | mu_thr = 2*mb_SI |
| | Decoupling threshold for bottom quarks.
|
| |
|
constexpr int | nl_bottom = 4 |
| | Number of light flavours for bottom-related functions.
|
| |
|
constexpr int | nl_top = 5 |
| | Number of light flavours for top-related functions.
|
| |
|
constexpr double | mu_f_bottom = 2. |
| | Default PS scale for bottom.
|
| |
|
constexpr double | mu_f_top = 20. |
| | Default PS scale for top.
|
| |
|
constexpr double | invGeV2_to_pb = 389379300. |
| | Conversion factor from 1/GeV^2 to picobarn.
|
| |
Physical constants.
Changes to the constants may require a recompilation of the whole QQbar_threshold library to take effect. Wherever possible, it is recommended to change settings via the options parameter of the QQbar_threshold functions instead.
- Author
- Andreas Maier a.mai.nosp@m.er@t.nosp@m.um.de
- Version
- 2.2.0
LICENSE
Copyright 2014, 2015, 2016 Andreas Maier
This file is part of the QQbar_threshold library.
The QQbar_threshold library is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
The QQbar_threshold library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with the QQbar_threshold library. If not, see http://www.gnu.org/licenses/.
1.8.13