Insight into particle production mechanisms via angular correlations of identified particles in pp collisions at root s=7 TeV

Two-particle angular correlations were measured in pp collisions at √ s = 7 TeV for pions, kaons, protons, and lambdas, for all particle/anti-particle combinations in the pair. Data for mesons exhibit an expected peak dominated by effects associated with mini-jets and are well reproduced by general purpose Monte Carlo generators. However, for baryon–baryon and anti-baryon–anti-baryon pairs, where both particles have the same baryon number, a near-side anti-correlation structure is observed instead of a peak. This effect is interpreted in the context of baryon production mechanisms in the fragmentation process. It currently presents a challenge to Monte Carlo models and its origin remains an open question.

K. Gulbrandsen | K. Gajdošová | A. Harton | G. Fronzé | J. Ferencei | A. Kluge | A. Matyja | T. Dahms | U. Kebschull | S. Ghosh | A. Francescon | P. Giubilato | B. Erazmus | M. Germain | A. Kisiel | J. Klay | L. Ducroux | P. Crochet | S. Gotovac | A. Gago | A. Feliciello | A. Grelli | C. Gargiulo | E. Gladysz-dziadus | S. Das | E. Garcia-Solis | G. Eulisse | S. Pasquale | J. Figiel | C. Deplano | O. Karavichev | A. Dainese | M. Danisch | A. Danu | S. Dash | S. De | A. Caro | G. Cataldo | J. Cuveland | A. Falco | D. Gruttola | N. Marco | H. Degenhardt | P. Dhankher | D. Bari | A. Mauro | T. Dietel | R. Divià | A. Dobrin | O. Dordic | A. Dubey | A. Dubla | P. Dupieux | R. Ehlers | D. Elia | F. Erhardt | B. Espagnon | D. Evans | S. Evdokimov | L. Fabbietti | J. Faivre | A. Fantoni | M. Fasel | G. Feofilov | A. Festanti | S. Filchagin | D. Finogeev | F. Fionda | S. Foertsch | P. Foka | S. Fokin | E. Fragiacomo | U. Fuchs | C. Furget | A. Furs | M. Girard | M. Gagliardi | C. D. Galvan | P. Ganoti | K. Garg | P. Gasik | P. Ghosh | P. Gianotti | P. Giubellino | V. Gonzalez | S. Gorbunov | V. Grabski | L. Graczykowski | K. L. Graham | C. Grigoras | A. Grigoryan | S. Grigoryan | F. Grosa | R. Guernane | T. Gunji | R. Haake | C. Hadjidakis | S. Hayashi | H. Helstrup | N. Hussain | D. Hutter | M. Inaba | M. Ippolitov | V. Ivanov | J. Jadlovský | M. Jercic | T. Karavicheva | E. Karpechev | R. Keidel | A. Khanzadeev | Y. Kharlov | A. Khatun | A. Khuntia | B. Kileng | S. Kirsch | I. Kisel | J. Klein | A. Knospe | C. Kobdaj | E. Kondratyuk | E. Kryshen | M. Krzewicki | D. Fabris | J. Gaardhøje | M. Floris | E. Fiore | S. Kiselev | F. Guber | C. Garabatos | M. Gallio | P. GONZÁLEZ-ZAMORA | M. Figueredo | U. Frankenfeld | L. Cunqueiro | A. Dash | A. Herghelegiu | A. Deloff | E. Cuautle | Ø. Djuvsland | B. Dönigus | H. Engel | S. Esumi | L. Feldkamp | P. Glässel | V. Grigoriev | R. Gupta | P. Khan | A. Konevskikh | A. Lardeux | D. Das | P. Dillenseger | D. D. Gimenez | A. Ramírez | M. Kofarago | A. Deisting | T. Drozhzhova | E. Endress | E. Epple | J. Eum | V. Feuillard | C. Gao | A. S. Gonzalez | J. Gronefeld | E. Hellbär | T. Hussain | L. Karayan | C. Klein | C. Kouzinopoulos | C. Conti | R. D. Souza | A. Francisco | V. Isakov | A. K. Duggal | M. Kielbowicz | P. Garg | A. Téllez | M. Corchero | A. Gupta | E. Ferreiro | L. Greiner | S. Ghosh | A. Ferretti | J. Mareš | S. Das | R. Gupta | C. D. Galván | A. S. Gonzalez | A. S. Gonzalez | R. Souza | K. Gajdosova | A. Duggal | Alice Collaboration

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