Inclusive photon production at forward rapidities in proton-proton collisions at root s=0.9, 2.76 and 7 TeV

B. Abelev; J. Adam; D. Adamova; MM. Aggarwal; G. Aglieri Rinella; Maria Agnello; A. Agostinelli; N. Agrawal; Z. Ahammed; N. Ahmad; Ian Bearden; Hans Bøggild; Christian Holm Christensen; Kristjan Herlache Gulbrandsen; Jens Jørgen Gaardhøje; Børge Svane Nielsen; Alexander Colliander Hansen; Ante Bilandzic; Marek Chojnacki; Valentina Zaccolo

doi:10.1140/epjc/s10052-015-3356-2

Inclusive photon production at forward rapidities in proton-proton collisions at root s=0.9, 2.76 and 7 TeV

B. Abelev, J. Adam, D. Adamova, MM. Aggarwal, G. Aglieri Rinella, Maria Agnello, A. Agostinelli, N. Agrawal, Z. Ahammed, N. Ahmad, Ian Bearden, Hans Bøggild, Christian Holm Christensen, Kristjan Herlache Gulbrandsen, Jens Jørgen Gaardhøje, Børge Svane Nielsen, Alexander Colliander Hansen, Ante Bilandzic, Marek Chojnacki, Valentina Zaccolo

Experimental Particle Physics

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Abstract

The multiplicity and pseudorapidity distributions of inclusive photons have been measured at forward rapidities (2.3 < η < 3.9) in proton–proton collisions at three center-of-mass energies, √s = 0.9, 2.76 and 7 TeV using the ALICE detector. It is observed that the increase in the average photon multiplicity as a function of beam energy is compatible with both a logarithmic and a power-law dependence. The relative increase in average photon multiplicity produced in inelastic pp collisions at 2.76 and 7 TeV center-of-mass energies with respect to 0.9 TeV are 37.2± 0.3% (stat) ± 8.8% (sys) and 61.2 ± 0.3 % (stat) ± 7.6% (sys), respectively. The photon multiplicity distributions for all center-of-mass energies are well described by negative binomial distributions. The multiplicity distributions are also presented in terms of KNO variables. The results are compared to model predictions, which are found in general to underestimate the data at large photon multiplicities, in particular at the highest center-of-mass energy. Limiting fragmentation behavior of photons has been explored with the data, but is not observed in the measured pseudorapidity range.

Original language	English
Article number	146
Journal	The European Physical Journal C: Particles and Fields
Volume	75
Issue number	4
ISSN	1434-6044
DOIs	https://doi.org/10.1140/epjc/s10052-015-3356-2
Publication status	Published - 1 Apr 2015

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Abelev, B., Adam, J., Adamova, D., Aggarwal, MM., Aglieri Rinella, G., Agnello, M., Agostinelli, A., Agrawal, N., Ahammed, Z., Ahmad, N., Bearden, I., Bøggild, H., Christensen, C. H., Gulbrandsen, K. H., Gaardhøje, J. J., Nielsen, B. S., Hansen, A. C., Bilandzic, A., Chojnacki, M., & Zaccolo, V. (2015). Inclusive photon production at forward rapidities in proton-proton collisions at root s=0.9, 2.76 and 7 TeV. The European Physical Journal C: Particles and Fields, 75(4), [146]. https://doi.org/10.1140/epjc/s10052-015-3356-2

Abelev, B, Adam, J, Adamova, D, Aggarwal, MM, Aglieri Rinella, G, Agnello, M, Agostinelli, A, Agrawal, N, Ahammed, Z, Ahmad, N, Bearden, I , Bøggild, H , Christensen, CH , Gulbrandsen, KH , Gaardhøje, JJ , Nielsen, BS, Hansen, AC, Bilandzic, A, Chojnacki, M & Zaccolo, V 2015, 'Inclusive photon production at forward rapidities in proton-proton collisions at root s=0.9, 2.76 and 7 TeV', The European Physical Journal C: Particles and Fields, vol. 75, no. 4, 146. https://doi.org/10.1140/epjc/s10052-015-3356-2

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title = "Inclusive photon production at forward rapidities in proton-proton collisions at root s=0.9, 2.76 and 7 TeV",

abstract = "The multiplicity and pseudorapidity distributions of inclusive photons have been measured at forward rapidities (2.3 < η < 3.9) in proton–proton collisions at three center-of-mass energies, √s = 0.9, 2.76 and 7 TeV using the ALICE detector. It is observed that the increase in the average photon multiplicity as a function of beam energy is compatible with both a logarithmic and a power-law dependence. The relative increase in average photon multiplicity produced in inelastic pp collisions at 2.76 and 7 TeV center-of-mass energies with respect to 0.9 TeV are 37.2± 0.3% (stat) ± 8.8% (sys) and 61.2 ± 0.3 % (stat) ± 7.6% (sys), respectively. The photon multiplicity distributions for all center-of-mass energies are well described by negative binomial distributions. The multiplicity distributions are also presented in terms of KNO variables. The results are compared to model predictions, which are found in general to underestimate the data at large photon multiplicities, in particular at the highest center-of-mass energy. Limiting fragmentation behavior of photons has been explored with the data, but is not observed in the measured pseudorapidity range.",

author = "B. Abelev and J. Adam and D. Adamova and MM. Aggarwal and {Aglieri Rinella}, G. and Maria Agnello and A. Agostinelli and N. Agrawal and Z. Ahammed and N. Ahmad and Ian Bearden and Hans B{\o}ggild and Christensen, {Christian Holm} and Gulbrandsen, {Kristjan Herlache} and Gaardh{\o}je, {Jens J{\o}rgen} and Nielsen, {B{\o}rge Svane} and Hansen, {Alexander Colliander} and Ante Bilandzic and Marek Chojnacki and Valentina Zaccolo",

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T1 - Inclusive photon production at forward rapidities in proton-proton collisions at root s=0.9, 2.76 and 7 TeV

AU - Abelev, B.

AU - Adam, J.

AU - Adamova, D.

AU - Aggarwal, MM.

AU - Aglieri Rinella, G.

AU - Agnello, Maria

AU - Agostinelli, A.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, N.

AU - Bearden, Ian

AU - Bøggild, Hans

AU - Christensen, Christian Holm

AU - Gulbrandsen, Kristjan Herlache

AU - Gaardhøje, Jens Jørgen

AU - Nielsen, Børge Svane

AU - Hansen, Alexander Colliander

AU - Bilandzic, Ante

AU - Chojnacki, Marek

AU - Zaccolo, Valentina

PY - 2015/4/1

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N2 - The multiplicity and pseudorapidity distributions of inclusive photons have been measured at forward rapidities (2.3 < η < 3.9) in proton–proton collisions at three center-of-mass energies, √s = 0.9, 2.76 and 7 TeV using the ALICE detector. It is observed that the increase in the average photon multiplicity as a function of beam energy is compatible with both a logarithmic and a power-law dependence. The relative increase in average photon multiplicity produced in inelastic pp collisions at 2.76 and 7 TeV center-of-mass energies with respect to 0.9 TeV are 37.2± 0.3% (stat) ± 8.8% (sys) and 61.2 ± 0.3 % (stat) ± 7.6% (sys), respectively. The photon multiplicity distributions for all center-of-mass energies are well described by negative binomial distributions. The multiplicity distributions are also presented in terms of KNO variables. The results are compared to model predictions, which are found in general to underestimate the data at large photon multiplicities, in particular at the highest center-of-mass energy. Limiting fragmentation behavior of photons has been explored with the data, but is not observed in the measured pseudorapidity range.

AB - The multiplicity and pseudorapidity distributions of inclusive photons have been measured at forward rapidities (2.3 < η < 3.9) in proton–proton collisions at three center-of-mass energies, √s = 0.9, 2.76 and 7 TeV using the ALICE detector. It is observed that the increase in the average photon multiplicity as a function of beam energy is compatible with both a logarithmic and a power-law dependence. The relative increase in average photon multiplicity produced in inelastic pp collisions at 2.76 and 7 TeV center-of-mass energies with respect to 0.9 TeV are 37.2± 0.3% (stat) ± 8.8% (sys) and 61.2 ± 0.3 % (stat) ± 7.6% (sys), respectively. The photon multiplicity distributions for all center-of-mass energies are well described by negative binomial distributions. The multiplicity distributions are also presented in terms of KNO variables. The results are compared to model predictions, which are found in general to underestimate the data at large photon multiplicities, in particular at the highest center-of-mass energy. Limiting fragmentation behavior of photons has been explored with the data, but is not observed in the measured pseudorapidity range.

U2 - 10.1140/epjc/s10052-015-3356-2

DO - 10.1140/epjc/s10052-015-3356-2

M3 - Journal article

SN - 1434-6044

VL - 75

JO - The European Physical Journal C: Particles and Fields

JF - The European Physical Journal C: Particles and Fields

IS - 4

M1 - 146

ER -

Inclusive photon production at forward rapidities in proton-proton collisions at root s=0.9, 2.76 and 7 TeV

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