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0001 # snippets/Exclusive
0002
0003 Snippets related to exclusive, diffractive, and tagged processes at the EIC.
0004
0005 ## `ePIC_ExcKinUtils.h`
0006
0007 This is a header file which contains functions for calculating exclusive kinematic quantities. In order to use these functions within any ePIC analysis, the following line should be added to the relevant scripts:
0008
0009 ```
0010 #include "snippets/Exclusive/ePIC_ExcKinUtils.h"
0011 ```
0012
0013 The header file here contains functions for calculating the following quantities:
0014 - The energy of a particle, from its scalar mass and vector momentum.
0015 - Missing mass (squared), momentum, pT and energy, for a 2-body final state (a + b -> c + d)
0016 - Missing mass (squared), momentum, pT and energy, for a 3-body final state (a + b -> c + d + f)
0017 - The Mandelstam variable t, using multiple methods as defined in the tRECO convention note
0018
0019
0020 The functions take as input the 4 vectors for particles identified within an ePIC event. These 4-vectors can take the form of any type which includes the relevant operators: `.E()`, `.P()`, `.Pt()` and `.M2()`. ROOT's legacy `TLorentzVector` class, and its more recent replacement, `ROOT::Math::LorentzVector`, both contain all of the operators required.
0021
0022 ## `teXBABE.h`
0023
0024 A header file to calculate teXBABE. This is a generic formulation of a calculation used in the analysis of DEMP events. Vectors and inputs have been named generically to match the tRECO convention for ease of use and readability.
0025
0026 ```
0027 #include "snippets/Exclusive/teXBABE.h"
0028 ```
0029
0030 The header file contains three methods for calculating teXBABE -
0031
0032 - An explicit method which takes 6 inputs
0033 - Detected scattered electron vector
0034 - Detected X vector
0035 - Detected baryon (BA) vector
0036 - Mass of the expected baryon (BA)
0037 - Electron beam vector
0038 - Hadron beam vector
0039 - A simplified method with 4 inputs
0040 - PMiss vector
0041 - Detected BA vector
0042 - Mass of the expected baryon (BA)
0043 - Hadron beam vector
0044 - Shortest method with 2 inputs
0045 - Corrected BA vector
0046 - Hadron beam vector
0047
0048 Some comments and additional explanations are included in the file.
0049
0050 ## Notes
0051
0052 A test of equivalence between ePIC_ExcKinUtils.h and teXBABE.h should be conducted.
