ColorFull::Col_str Class Reference
Detailed DescriptionA class to contain ONE color structure, a direct product of Quark_lines, multiplying a Polynomial, Poly. The Quark_lines are stored as components in a vector, a col_str. Constructor & Destructor Documentation◆ Col_str() [1/3]
Default constructor, leaves cs empty. ◆ Col_str() [2/3]
Constructor for setting the color structure using a string. Should be used as: "Col_str Cs("2*Nc*TR^(3) [{1,2,3,4}(5,6)(7,8)(9,10,11,12)]");", i.e. the argument should be a Polynomial * col_str. (The Polynomial should multiply the whole col_str, rather than a quark_line inside the [] brackets.) ◆ Col_str() [3/3]
Make a Col_str of a Quark_line. Member Function Documentation◆ append() [1/2]
Appends a Quark_line to data member cs. ◆ append() [2/2]
Append the content of a col_str to the cs of the Col_str. ◆ at() [1/3]
Returns the Quark_line at place i. ◆ at() [2/3]
Returns the Quark_line at place i. ◆ at() [3/3]
Returns the parton at place j in Quark_line i. ◆ clear()
Erase information in col_str. ◆ conjugate()
Function for conjugating the Col_str by conjugating each Quark_line in cs, as well as the Polynomial Poly. ◆ contract_2_rings()
Function for contracting gluon indices in closed Quark_lines with only 2 gluons. This removes the 2-ring, replaces one of the gluon indices,, and multiplies with a factor tr[t^a t^a]=TR (no sum), only intended for fully contractable Col_strs. ◆ contract_next_neighboring_gluons()
Contracts neighboring and next to neighboring gluons in each Quark_line in the Col_str, starting with contracting neighbors. This function should only be used on Col_strs with only closed Quark_lines. ◆ contract_quarks()Function for contracting quarks between two color structures Cs1 and Cs2. The result is stored in the Col_str itself. ◆ empty()
Is the col_str empty? ◆ erase() [1/3]
Erases the Quark_line at place i. ◆ erase() [2/3]
Erases the parton at place i, j. ◆ erase() [3/3]
Erases a parton at location place. ◆ find_kind()
Finds out if a parton is a quark, anti-quark or a gluon, returns "q", "qbar" or "g" respectively. This function does NOT loop over all partons, but assumes that the parton is a gluon if the Quark_line is closed, or if the Quark_line is open, but p cannot be found in the ends. ◆ find_parton()
Locates the parton with number part_num in a Col_str. ◆ gluons_only()
Checks if the amplitude only has gluons, i.e. if all Quark_lines are closed. ◆ insert()
To insert the parton part_num in quark_line i at place j. ◆ left_neighbor()
Function for telling if parton p2 stands to the left of parton p1. ◆ longest_quark_line()
Returns the length of the longest Quark_line in the Col_str. ◆ n_gluon()
Counts the number of gluons in a Col_str. Counts all gluon indices, both free and contractable. ◆ n_quark()
Counts the number of quarks (=number of anti-quarks) in a Col_str. Counts all quark indices, both free and contracted. ◆ neighbor()
Function for telling if the partons p1 and p2 are neighbors. ◆ normal_order()
Normal orders the Col_str by first normal order individual Quark_lines and then normal order different Quark_lines in the cs. For the ordering see the member function smallest in this class and in the Quark_line class. ◆ read_in_Col_str()
Function for reading in the Col_str from the file filename. ◆ remove_0_rings()
Removes Quark_lines without partons, equal to Nc (closed) or 1 (open). ◆ remove_1_rings()
Removes Quark_lines with only one gluon as Tr(t^a)=0. ◆ replace()
Replaces the parton index old_ind with new_ind. ◆ right_neighbor()
Function for telling if parton p2 stands to the right of parton p1. ◆ simplify()
Removes 0 and 1-rings, moves factors multiplying the individual Quark_lines to multiply the col_str instead (i.e., being stored in Poly) simplifies the Polynomial and normal orders the quark_lines. ◆ size()
The size of the col_str. ◆ smallest()Finds out the "smallest" Col_str of two Col_strs, i.e. which Col_str should stand first in a normal ordered Col_amp or basis. Returns 1, if Cs1 should stand before Cs2 and 2 if Cs2 should stand before Cs1. Both Col_strs have to be normal ordered for the result to be unique. The Col_strs are ordered by (1) number of Quark_lines (2) if the Quark_line at place 0,1,2... is open or not (3) the size of the Quark_line at place 1,2,3... (4) the parton numbers in the Quark_lines at place 1,2,3..., i.e. first the first parton in the first Quark_line is checked and last the last parton in the last Quark_line. The function returns 0 if Cs1=Cs2. ◆ write_out_Col_str()
Function for writing out the Col_str to a file with name filename. Member Data Documentation◆ cs
For containing the information about the color structure, a direct product of Quark_lines, contained in a vector of quark-lines. ◆ Poly
Polynomial factor multiplying the whole product of quark-lines. The documentation for this class was generated from the following file:
Generated on Fri Jun 2 2017 11:57:53 for ColorFull by 
1.8.13
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