Measurement of inclusive very forward jet cross sections in proton-lead collisions at sqrt{s_{mathrm{NN}}} = 5.02 TeV

A A Bin Anuar,A Bat,A Bodek,A Bornheim,A Bragagnolo,A Calderón ,A Delgado Peris,A Di Mattia,A Escalante Del Valle,A García-Bellido ,A Rinkevičius ,A Rácz ,A Rýd ,A Sánchez-Hernández ,A Vagnerini,A Vilela Pereira,A Çakır ,A Çelik ,Arun Kumar,Ashok Kumar,B Akgün ,B Chazin Quero,B Işıldak ,B Tali,B Ujvári ,B Wysłouch ,C Diez Pardos,C F Gonźalez Herńandez ,C Fernandez Bedoya,C H Shepherd‐Themistocleous ,C Hajdú ,C Martínez Rivero ,C Peña ,C Schwanenberger,C Tuvé ,C Vander Velde,C Ávila ,Clemencia Mora Herrera ,D Blöch ,D De Jesus Damião ,D Di Croce,D Doḿınguez Damiani ,D Ferenček ,D Horváth ,D Kotliński ,D Ćutts ,Dan Yu ,David Romero Abad ,Diego Matos Figueiredo ,E Carrera Jarrin,E Clément ,E De La Cruz-Burelo,E Di Marco,E Eskandari Tadavani,E Palencia Cortezon,F Nessi‐Tedaldi ,F Pauß ,F Rezaei Hosseinabadi,F Siklér ,F Simonetto,F Vazzoler,F Özok ,Feng Liu ,G A Bogdanova ,G Bauer,G Cucciati,G De Lentdecker,G Della Ricca,G G Da Silveira,G Gómez ,G Gökbulut ,G Hamel De Monchenault ,G Martı́nez ,G Mäggi ,G P Siroli,G P Van Onsem,G Paspalaki,G Pásżtor ,G Zevi Della Porta,G Önengüt ,Gabriella Pugliese ,Gian Luca Pinna Angioni ,Gian Michele Innocenti ,H Białkowska ,H Castilla‐Valdez ,H El Mamouni,H Flächer ,H Oğul ,H S Chen,H Sert,H Topakli,Hannsjoerg Artur Weber ,Hans-Christian Kaestli ,I Babounikau,I De Bruyn,I González Caballero ,I Hoş ,I Van Parijs,Imad Baptiste Laktineh ,J Alcaraz Maestre,J Andreä ,J D Tapia ∋Takaki ,J Fernández Menéndez ,J Hoß ,J Królikowski ,J Königsberg ,J L Dulemba,J M Hernández ,J Malclès ,J Milošević ,J Molnár ,J Piedra Gomez,J R Gonźalez Ferńandez ,J W Gary,Jaehoon Lim ,Jay Mathew Lawhorn ,Jesús Puerta Pelayo ,Joern Schwandt ,Jui-Fa Tsai ,K Buńkowski ,K Cankoçak ,K Ehataht,K Hurtado Anampa,K Höepfner ,K Vellidis,K Wichmann,K Özdemir ,Karl Matthew Ecklund ,Kin Ho Lo ,Kristan Allan Hahn ,L A Khein ,L Alunni Solestizi,L Felď ,L Lloret Iglesias,M Besançon ,M Calderón De La Barca Sánchez ,M Csanád ,M De Mattia,M Della Negra,M Déjardin ,M 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Jain,Sanjeev Kumar ,Sarmad Masood Shaheen ,Seth Conrad Zenz ,Sh Jain,Silvia Goy López ,T Geralis,T Maënpaä ,T Tabarelli De Fatis,T Du Pree,T Šuša ,T.k Alexander ,Tao Huang ,Thea Klaeboe Aarrestad ,U K Yang,V Brigljević ,V Dūdėnas ,V Kutzner,V Lemaı̂tre ,V Monaco,V V Mitsyn,V Veszprémi ,W Van Doninck,Wan Ahmad Tajuddin Wan Abdullah ,Xie Wang ,Y Chào ,Y Güler ,Yang Yu ,Yu Andreev,Yu I Skovpen ,Yuan Li ,Z L Trócsányi ,Z Shi ,Z Szillási ,A Abdulsalam,A Ackert,A Agapitos,A Ahmad,A Albert,A Apresyan,A Apyan,A Askew,A Attikis,A Babaev,A Baden,A Barker,A Baskakov,A Baty,A Bean,A Belloni,A Belyaev,A Benaglia,A Benecke,A Beretvas,A Bermúdez Martínez,A Beschi,A Bhardwaj,A Bocci,A Boletti,A Borzou,A Braghieri,A Brinkerhoff,A Buccilli,A Bundock,A Bylinkin,A Byszuk,A C Benvenuti,A C Marini,A C Mignerey,A Cabrera,A Campbell,A Canepa,A Carnes,A Carvalho Antunes De Oliveira,A Castaneda Hernandez,A Castro,A Cocoros,A Colaleo,A Dabrowski,A Dasgupta,A Datta,A David,A De Cosa,A De Roeck,A De Wit,A Degano,A 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,А Спиридонов ,В Жуков ,В Качанов ,В Сулимов ,Д Педрини ,Н Голубев ,Р Тенчини

doi:10.1007/jhep05(2019)043

Abstract

Measurements of differential cross sections for inclusive very forward jet production in proton-lead collisions as a function of jet energy are presented. The data were collected with the CMS experiment at the LHC in the laboratory pseudorapidity range −6.6 < η < −5.2. Asymmetric beam energies of 4 TeV for protons and 1.58 TeV per nucleon for Pb nuclei were used, corresponding to a center-of-mass energy per nucleon pair of sqrt{s_{mathrm{NN}}} = 5.02 TeV. Collisions with either the proton (p+Pb) or the ion (Pb+p) traveling towards the negative η hemisphere are studied. The jet cross sections are unfolded to stable-particle level cross sections with pT ≳ 3 GeV, and compared to predictions from various Monte Carlo event generators. In addition, the cross section ratio of p+Pb and Pb+p data is presented. The results are discussed in terms of the saturation of gluon densities at low fractional parton momenta. None of the models under consideration describes all the data over the full jet-energy range and for all beam configurations. Discrepancies between the differential cross sections in data and model predictions of more than two orders of magnitude are observed.

Highlights

The jet cross sections are unfolded to stable-particle level cross sections with pT 3 GeV, and compared to predictions from various Monte Carlo event generators
The unfolded differential cross sections for inclusive forward jet production as a function of jet energy are shown in figure 4 for p+Pb and figure 5 for Pb+p data
Whereas jets in the p+Pb data probe the ion parton density at low values of x and are sensitive to possible enhanced saturation effects in nuclei, the Pb+p cross section would be sensitive to the low-x content of the proton, which is expected to be less affected by saturation

Summary

The CMS detector

The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diameter, providing a magnetic field of 3.8 T. Forward calorimeters extend the η coverage provided by the barrel and endcap detectors. The two HF detectors are located at 11.2 m from the interaction point, one on each side of CMS, and together they provide coverage in the range 3.0 < |η| < 5.2. The very forward angles, i.e., −6.6 < η < −5.2, are covered at one end of CMS by the CASTOR calorimeter, located at 14 m from the interaction point. The remaining twelve modules constitute the hadronic section and are approximately nine nuclear interaction lengths deep. The intrinsic relative jet-energy resolution of CASTOR is approximately 25 (10)% for fully contained jets (i.e., jets that do not suffer from transverse leakage) of 550 (2500) GeV. The effective relative jet-energy resolution deteriorates to approximately 60 (25)% at 550 (2500) GeV. A more detailed description of the CMS detector, together with a definition of the coordinate system used and the relevant kinematic variables, can be found in ref. [30]

Event generators

Data analysis

Systematic uncertainties

Results

Summary