pi+ and pi- m_t spectra for C+C at 1 and 2 A GeV, and Ar+KCl at 1.76 A GeV

(1/(m_t*m_t))*dN/dm_t [1./(MeV/c^2)^3] distributions in separate rapidity bins

multiplicity in LVL1 trigger events (trigger biased), data shown from a full acceptance region

Normalization:

to one LVL1 event, to 1 MeV/c^2

NOT normalized to rapidity unit, just yield in +-0.1 window in y_lab

list of files:

piminus_cc2000_mt_y*.vec piminus_cc2000_mt_y*.vec piplus_cc1000_mt_y*.vec piplus_cc2000_mt_y*.vec piminus_arkcl1760_mt_y*.vec piplus_arkcl1760_mt_y*.vec

1 row contents: m_t-m_pi (center of bin, in MeV/c), yield, error

Rapidity bins:             C1C          C2C          ArKCl      
                      y_cm = 0.677    y_cm=0.904   y_cm = 0.857

     y_lab - y_cm          bin          bin        bin
   (in y_lab units)

     -0.7 to -0.5                        1          1
     -0.5    -0.3           1            2          2
     -0.3    -0.1           2            3          3
     -0.1    +0.1           3            4          4  == midrapidity
     +0.1    +0.3           4            5          5
     +0.3    +0.5           5            6          6
     +0.5    +0.7           6            7          7
     +0.7    +0.9           7

trigger bias:

To get multiplicity for minimum bias, the data points have to be divided by the trigger enhancement factor F = A_part(LVL1)/A_part(min.bias):

CC1 8.61/6

CC2 8.38/6

ArKCl 38.5 /19.25

data are published in:

CC: Eur. Phys. J. A 40 (2009) 45 (also arXiv:0902.4377 [nucl-ex]), Fig. 8 and 9

ArKCl: Phys.Rev. C84 (2011) 014902 (also arXiv:1103.0876 [nucl-ex]) Fig.4

For ArKCl pi+ and pi- averaged data are shown with different normalization:

normalization a) to unit of y_lab (multiplied by 5)

b) divided by A_part=38.5

c) in (1/!GeV/c^2)^3 i.e. by factor of 10^9 larger

all ArKCl mt spectra are shown in Fig.1 in arXiv:0906.2309v1 (Bormio 2009). Fig.1 shows the multiplicity per a 25 MeV bin, so to compare to the tables attached here one has to divide it by 25.

-- PavelTlusty - 20 Jun 2013