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Measurements of longitudinal and transverse momentum distributions for neutral pions in the forward-rapidity region with the LHCf detector

The collaboration
Phys.Rev. D94 (2016) 032007, 2016

Abstract (data abstract)
CERN-LHC. The differential cross sections for inclusive neutral pions as a function of transverse and longitudinal momentum in the very forward rapidity region have been measured at the Large Hadron Collider (LHC) with the Large Hadron Collider forward detector (LHCf) in proton-proton collisions at $\sqrt{s}=$ 2.76 and 7 TeV and in proton-lead collisions at nucleon-nucleon center-of-mass energies of $\sqrt{s_\text{NN}}=$ 5.02 TeV. Such differential cross sections in proton-proton collisions are compatible with the hypotheses of limiting fragmentation and Feynman scaling. Comparing proton-proton with proton-lead collisions, we find a sizable suppression of the production of neutral pions in the differential cross sections after subtraction of ultra-peripheral proton-lead collisions. This suppression corresponds to the nuclear modification factor value of about 0.1-0.3. The experimental measurements presented in this paper provide a benchmark for the hadronic interaction Monte Carlo simulation codes that are used for the simulation of cosmic ray air showers.

• #### Table 1

Data from Table 3

10.17182/hepdata.74066.v1/t1

The average $\pi^{0}$ transverse momenta for the rapidity range $8.8<y<10.6$ in $p+p$ collisions at $\sqrt{s}=2.76$ and 7 TeV and for...

• #### Table 2

Data from Table 4

10.17182/hepdata.74066.v1/t2

Production rate for the $\pi^{0}$ production in the rapidity range $8.8 < y < 9.0$ in $p+p$ collisions and in...

• #### Table 3

Data from Table 5

10.17182/hepdata.74066.v1/t3

Production rate for the $\pi^{0}$ production in the rapidity range $9.0 < y < 9.2$ in $p+p$ collisions and in...

• #### Table 4

Data from Table 6

10.17182/hepdata.74066.v1/t4

Production rate for the $\pi^{0}$ production in the rapidity range $9.2 < y < 9.4$ in $p+p$ collisions and in...

• #### Table 5

Data from Table 7

10.17182/hepdata.74066.v1/t5

Production rate for the $\pi^{0}$ production in the rapidity range $9.4 < y < 9.6$ in $p+p$ collisions and in...

• #### Table 6

Data from Table 8

10.17182/hepdata.74066.v1/t6

Production rate for the $\pi^{0}$ production in the rapidity range $9.6 < y < 9.8$ in $p+p$ collisions and in...

• #### Table 7

Data from Table 9

10.17182/hepdata.74066.v1/t7

Production rate for the $\pi^{0}$ production in the rapidity range $9.8 < y < 10.0$ in $p+p$ collisions and in...

• #### Table 8

Data from Table 10

10.17182/hepdata.74066.v1/t8

Production rate for the $\pi^{0}$ production in the rapidity range $10.0 < y < 10.2$ in $p+p$ collisions and in...

• #### Table 9

Data from Table 11

10.17182/hepdata.74066.v1/t9

Production rate for the $\pi^{0}$ production in the rapidity range $10.2 < y < 10.4$ in $p+p$ collisions and in...

• #### Table 10

Data from Table 12

10.17182/hepdata.74066.v1/t10

Production rate for the $\pi^{0}$ production in the rapidity range $10.4 < y < 10.6$ in $p+p$ collisions and in...

• #### Table 11

Data from Table 13

10.17182/hepdata.74066.v1/t11

Production rate for the $\pi^{0}$ production in the rapidity range $10.6 < y < 10.8$ in $p+p$ collisions and in...

• #### Table 12

Data from Table 14

10.17182/hepdata.74066.v1/t12

Production rate for the $\pi^{0}$ production in the $p_\rm{T}$ range $0.0 < p_\rm{T} < 0.2$ GeV in $p+p$ and $p+\rm{Pb}$...

• #### Table 13

Data from Table 15

10.17182/hepdata.74066.v1/t13

Production rate for the $\pi^{0}$ production in the $p_\rm{T}$ range $0.2 < p_\rm{T} < 0.4$ GeV in $p+p$ and $p+\rm{Pb}$...

• #### Table 14

Data from Table 16

10.17182/hepdata.74066.v1/t14

Production rate for the $\pi^{0}$ production in the $p_\rm{T}$ range $0.4 < p_\rm{T} < 0.6$ GeV in $p+p$ and $p+\rm{Pb}$...

• #### Table 15

Data from Table 17

10.17182/hepdata.74066.v1/t15

Production rate for the $\pi^{0}$ production in the $p_\rm{T}$ range $0.6 < p_\rm{T} < 0.8$ GeV in $p+p$ and $p+\rm{Pb}$...

• #### Table 16

Data from Table 18

10.17182/hepdata.74066.v1/t16

Production rate for the $\pi^{0}$ production in the $p_\rm{T}$ range $0.8 < p_\rm{T} < 1.0$ GeV in $p+p$ and $p+\rm{Pb}$...

• #### Table 17

Data from Table 56

10.17182/hepdata.74066.v1/t17

Nuclear modification factor for the $\pi^{0}$s in the rapidity ranges $-8.8>y_\rm{lab}>-9.0$, $-9.0>y_\rm{lab}>-9.2$, and $-9.2>y_\rm{lab}>-9.4$ in $p+\rm{Pb}$ collisions at $\sqrt{s_\rm{NN}}=5.02$ TeV....

• #### Table 18

Data from Table 57

10.17182/hepdata.74066.v1/t18

Nuclear modification factor for the $\pi^{0}$s in the rapidity ranges $-9.4>y_\rm{lab}>-9.6$, $-9.6>y_\rm{lab}>-9.8$, and $-9.8>y_\rm{lab}>-10.0$ in $p+\rm{Pb}$ collisions at $\sqrt{s_\rm{NN}}=5.02$ TeV....

• #### Table 19

Data from Table 58

10.17182/hepdata.74066.v1/t19

Nuclear modification factor for the $\pi^{0}$s in the rapidity ranges $-10.0>y_\rm{lab}>-10.2$, $-10.2>y_\rm{lab}>-10.4$, and $-10.4>y_\rm{lab}>-10.6$ in $p+\rm{Pb}$ collisions at $\sqrt{s_\rm{NN}}=5.02$ TeV....

• #### Table 20

Data from Table 59

10.17182/hepdata.74066.v1/t20

Nuclear modification factor for the $\pi^{0}$s in the rapidity ranges $-10.6>y_\rm{lab}>-10.8$ in $p+\rm{Pb}$ collisions at $\sqrt{s_\rm{NN}}=5.02$ TeV. The uncertainties include...