[Blackmax] Interesting eta distributions from BlackMax

[Chris Pollard]

Hello BlackMax authors,

A few of my colleagues at Duke and I have been using with your generator off
and on for a year now, and we've recently found some puzzling eta
distributions coming out of it.

For instance, I've attached graph that comes from proton-proton collisions
at 7 TeV with the two particle final state setting on.  This is for the
top+graviton channel.  We can't think of why the eta distributions for the
tops and gravitons would be asymmetric at a proton-proton collider,

We see similar asymmetries for the top+bottom and top+strange final state
eta distributions, while top+charm and top+up final states are symmetric, as
expected.

One other thing we've noticed is that for whatever reason, the generator
output is always "sorted" based on some parameter when the asymmetry arises.
 For instance, when the final state is top+charm, the top can be either the
first or second particle listed in the output, each about half the time.
 But in the top+graviton final state, the top is *always* listed second, and
in the tob+bottom final state, always first.

This seems strange to us, but perhaps we are overlooking something?

I've also attached my parameter.txt file if that helps.  Maybe I have an
error there.

Thanks for your time!

Chris Pollard
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Number_of_simulations
100000
incoming_particle(1:pp_2:ppbar_3:ee+)
1
Center_of_mass_energy_of_incoming_particle
7000
M_pl(GeV)
1000.
definition_of_M_pl:(1:M_D_2:M_p_3:M_DL_4:put_in_by_hand)
1
if_definition==4
1.
Choose_a_case:(1:tensionless_nonrotating_2:tension_nonrotating_3:rotating_nonsplit_4:Lisa_two_particles_final_states)
4
number_of_extra_dimensions
6
number_of_splitting_dimensions
0
size_of_brane(1/Mpl)
1.0
extradimension_size(1/Mpl)
1.0
tension(parameter_of_deficit_angle:1_to_0)
1.0
choose_a_pdf_file(200_to_240_cteq6)Or_>10000_for_LHAPDF
200
Chose_events_by_center_of_mass_energy_or_by_initial_black_hole_mass(1:center_of_mass_2:black_hole_mass)
2
Minimum_mass(GeV)
1000.
Maxmum_mass(GeV)
14000.
Include_string_ball:(1:no_2:yes)
1
String_scale(M_s)(GeV)
1000
string_coupling(g_s)
0.8
The_minimum_mass_of_a_string_ball_or_black_hole(in_unit_Mpl)
1.
fix_time_step(1:fix_2:no)
2
time_step(1/GeV)
1.e-5
other_definition_of_cross_section(0:no_1:yoshino_2:pi*r^2_3:4pi*r^2)
0
calculate_the_cross_section_according_to(0:the_radius_of_initial_black_hole_1:centre_of_mass_energy)
0
calculate_angular_eigen_value(0:calculate_1:fitting_result)
0
Mass_loss_factor(0~1.0)
0.0
momentum_loss_factor(0~1.0)
0.0
Angular_momentum_loss_factor(0~1.0)
0.0
turn_on_graviton(0:off_1:on)
1
Seed
123589541
Write_LHA_Output_Record?_0=NO__1=Yes_2=More_Detailed_output
2
L_suppression(1:none_2:delta_area_3:anular_momentum_4:delta_angular_momentum)
1
angular_momentum_suppression_factor
1
charge_suppression(1:none_2:do)
1
charge_suppression_factor
1
color_suppression_factor
.20
split_fermion_width(1/Mpl)_and_location(from-15to15)(up_to_9extradimensions)
u_quark_Right(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
u_quark_Left(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
u_bar_quark_Right(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
u_bar_quark_Left(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
d_quark_Right(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
d_quark_Left(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
d_bar_quark_Right(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
d_bar_quark_Left(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
s_quark_Right(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
s_quark_Left(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
s_bar_quark_Right(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
s_bar_quark_Left(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
c_quark_Right(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
c_quark_Left(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
c_bar_quark_Right(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
c_bar_quark_Left(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
b_quark_Right(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
b_quark_Left(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
b_bar_quark_Right(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
b_bar_quark_Left(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
t_quark_Right(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
t_quark_Left(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
t_bar_quark_Right(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
t_bar_quark_Left(Note:do_not_insert_blank_spaces)
1.0
10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
e_-_Left(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
e_-_Right(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
e_+_Left(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
e_+_Right(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
mu_-_Left(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
mu_-_Right(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
mu_+_Left(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
mu_+_Right(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
tau_-_Left(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
tau_-_Right(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
tau_+_Left(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
tau_+_Right(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
nutrino_e-(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
nutrino_e+(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
nutrino_mu-(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
nutrino_mu+(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
nutrino_tau-(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
nutrino_tau+(Note:do_not_insert_blank_spaces)
1.0
-10.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0
number_of_conservation
1
d,s,b,u,c,t,e,mu,tau,nu_e,nu_mu,nu_tau 1,1,1,1,1,1,0,0,0,0,0,0
0,0,0,0,0,0,1,1,1,1,1,1
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