Insight into particle production mechanisms via angular correlations of identified particles in pp collisions at $$\sqrt{\mathrm{s}}=7$$ s=7  TeV

• Published in: The European physical journal. C, Particles and fields Vol. 77; no. 8; pp. 1 - 17
• Main Authors: Adam, J., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S. U., Aiola, S., Akindinov, A., Alam, S. N., Albuquerque, D. S. D., Aleksandrov, D., Alessandro, B., Alexandre, D., Alfaro Molina, R., Alici, A., Alkin, A., Alme, J., Alt, T., Altinpinar, S., Altsybeev, I., Alves Garcia Prado, C., An, M., Andrei, C., Andrews, H. A., Andronic, A., Anguelov, V., Anson, C., Antičić, T., Antinori, F., Antonioli, P., Anwar, R., Aphecetche, L., Appelshäuser, H., Arcelli, S., Arnaldi, R., Arnold, O. W., Arsene, I. C., Arslandok, M., Audurier, B., Augustinus, A., Averbeck, R., Azmi, M. D., Badalà, A., Baek, Y. W., Bagnasco, S., Bailhache, R., Bala, R., Baldisseri, A., Baral, R. C., Barbano, A. M., Barbera, R., Barile, F., Barioglio, L., Barnaföldi, G. G., Barnby, L. S., Barret, V., Bartalini, P., Barth, K., Bartke, J., Bartsch, E., Basile, M., Bastid, N., Basu, S., Bathen, B., Batigne, G., Batista Camejo, A., Batyunya, B., Batzing, P. C., Bearden, I. G., Beck, H., Bedda, C., Behera, N. K., Belikov, I., Bellini, F., Bello Martinez, H., Bellwied, R., Beltran, L. G. E., Belyaev, V., Bencedi, G., Beole, S., Bercuci, A., Berdnikov, Y., Berenyi, D., Bertens, R. A., Berzano, D., Betev, L., Bhasin, A., Bhat, I. R., Bhati, A. K., Bhattacharjee, B., Bhom, J., Bianchi, L., Bianchi, N., Bianchin, C., Bielčík, J., Bielčíková, J., Bilandzic, A.
• Format: Journal Article
• Language: English
• Published: SpringerOpen 01.08.2017
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-017-5129-6

Abstract Two-particle angular correlations were measured in pp collisions at $$\sqrt{s} = 7$$ 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.