K− over K+ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy

Akhunzyanov, R.; Alexeev, M. G.; Alexeev, G. D.; Amoroso, A.; Andrieux, V.; Anfimov, N. V.; Anosov, V.; Antoshkin, A.; Augsten, K.; Augustyniak, W.; Austregesilo, A.; Azevedo, C. D. R.; Badełek, B.; Balestra, F.; Ball, M.; Barth, J.; Beck, R.; Bedfer, Y.; Bernhard, J.; Bicker, K.; Bielert, E. R.; Birsa, R.; Bodlak, M.; Bordalo, P.; Bradamante, F.; Bressan, A.; Büchele, M.; Burtsev, V. E.; Capozza, L.; Chang, W. -C.; Chatterjee, C.; Chiosso, M.; Chumakov, A. G.; Chung, S. -U.; Cicuttin, A.; Crespo, M. L.; Curiel, Q.; Dalla Torre, S.; Dasgupta, S. S.; Dasgupta, S.; Denisov, O. Yu.; Dhara, L.; Donskov, S. V.; Doshita, N.; Dreisbach, Ch.; Dünnweber, W.; Dusaev, R. R.; Dziewiecki, M.; Efremov, A.; Eversheim, P. D.; Faessler, M.; Ferrero, A.; Finger, M.; Finger, M.; Fischer, H.; Franco, C.; du Fresne von Hohenesche, N.; Friedrich, J. M.; Frolov, V.; Gautheron, F.; Gavrichtchouk, O. P.; Gerassimov, S.; Giarra, J.; Gnesi, I.; Gorzellik, M.; Grasso, A.; Gridin, A.; Grosse Perdekamp, M.; Grube, B.; Guskov, A.; Hahne, D.; Hamar, G.; von Harrach, D.; Heitz, R.; Herrmann, F.; Horikawa, N.; D'Hose, N.; Hsieh, C. -Y.; Huber, S.; Ishimoto, S.; Ivanov, A.; Iwata, T.; Jary, V.; Joosten, R.; Jörg, P.; Kabuß, E.; Kerbizi, A.; Ketzer, B.; Khaustov, G. V.; Khokhlov, Yu. A.; Kisselev, Yu.; Klein, F.; Koivuniemi, J. H.; Kolosov, V. N.; Kondo, K.; Konorov, I.; Konstantinov, V. F.; Kotzinian, A. M.; Kouznetsov, O. M.; Kral, Z.; Krämer, M.; Krinner, F.; Kroumchtein, Z. V.; Kulinich, Y.; Kunne, F.; Kurek, K.; Kurjata, R. P.; Kuznetsov, I. I.; Kveton, A.; Lednev, A. A.; Levchenko, E. A.; Levorato, S.; Lian, Y. -S.; Lichtenstadt, J.; Longo, R.; Lyubovitskij, V. E.; Maggiora, A.; Magnon, A.; Makins, N.; Makke, N.; Mallot, G. K.; Mamon, S. A.; Marchand, C.; Marianski, B.; Martin, A.; Marzec, J.; Matoušek, J.; Matsuda, H.; Matsuda, T.; Meshcheryakov, G. V.; Meyer, M.; Meyer, W.; Mikhailov, Yu. V.; Mikhasenko, M.; Mitrofanov, E.; Mitrofanov, N.; Miyachi, Y.; Moretti, A.; Nagaytsev, A.; Nerling, F.; Neyret, D.; Nový, J.; Nowak, W. -D.; Nukazuka, G.; Nunes, A. S.; Olshevsky, A. G.; Orlov, I.; Ostrick, M.; Panzieri, D.; Parsamyan, B.; Paul, S.; Peng, J. -C.; Pereira, F.; Pesaro, G.; Pešek, M.; Pešková, M.; Peshekhonov, D. V.; Pierre, N.; Platchkov, S.; Pochodzalla, J.; Polyakov, V. A.; Pretz, J.; Quaresma, M.; Quintans, C.; Ramos, S.; Regali, C.; Reicherz, G.; Riedl, C.; Ryabchikov, D. I.; Rybnikov, A.; Rychter, A.; Salac, R.; Samoylenko, V. D.; Sandacz, A.; Sarkar, S.; Savin, I. A.; Sawada, T.; Sbrizzai, G.; Schiavon, P.; Schmieden, H.; Seder, E.; Selyunin, A.; Silva, L.; Sinha, L.; Sirtl, S.; Slunecka, M.; Sozzi, F.; Smolik, J.; Srnka, A.; Steffen, D.; Stolarski, M.; Subrt, O.; Sulc, M.; Suzuki, H.; Szabelski, A.; Szameitat, T.; Sznajder, P.; Tasevsky, M.; Tessaro, S.; Tessarotto, F.; Thiel, A.; Tomsa, J.; Tosello, F.; Tskhay, V.; Uhl, S.; Vasilishin, B. I.; Vauth, A.; Veit, B. M.; Veloso, J.; Vidon, A.; Virius, M.; Wallner, S.; Wilfert, M.; Windmolders, R.; Zaremba, K.; Zavada, P.; Zavertyaev, M.; Zemlyanichkina, E.; Ziembicki, M.

doi:10.1016/j.physletb.2018.09.052

The K− over K+ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction z of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and an isoscalar 6LiD target. The regime of deep-inelastic scattering is ensured by requiring Q2>1(GeV/c)2 for the photon virtuality and W>5GeV/c2 for the invariant mass of the produced hadronic system. Kaons are identified in the momentum range from 12 GeV/c to 40 GeV/c, thereby restricting the range in Bjorken-x to 0.01<x<0.40. The z-dependence of the multiplicity ratio is studied for z>0.75. For very large values of z, i.e. z>0.8, we observe the kaon multiplicity ratio to fall below the lower limits expected from calculations based on leading and next-to-leading order perturbative quantum chromodynamics. Also, the kaon multiplicity ratio shows a strong dependence on the missing mass of the single-kaon production process. This suggests that within the perturbative quantum chromodynamics formalism an additional correction may be required, which takes into account the phase space available for hadronisation.

K− over K+ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy

Akhunzyanov, R.;Alexeev, M. G.;Alexeev, G. D.;Amoroso, A.;Andrieux, V.;Anfimov, N. V.;Anosov, V.;Antoshkin, A.;Augsten, K.;Augustyniak, W.;Austregesilo, A.;Azevedo, C. D. R.;Badełek, B.;Balestra, F.;Ball, M.;Barth, J.;Beck, R.;Bedfer, Y.;Bernhard, J.;Bicker, K.;Bielert, E. R.;Birsa, R.;Bodlak, M.;Bordalo, P.;Bradamante, F.;Bressan, A.;Büchele, M.;Burtsev, V. E.;Capozza, L.;Chang, W. -C.;Chatterjee, C.;Chiosso, M.;Chumakov, A. G.;Chung, S. -U.;Cicuttin, A.;Crespo, M. L.;Curiel, Q.;Dalla Torre, S.;Dasgupta, S. S.;Dasgupta, S.;Denisov, O. Yu.;Dhara, L.;Donskov, S. V.;Doshita, N.;Dreisbach, Ch.;Dünnweber, W.;Dusaev, R. R.;Dziewiecki, M.;Efremov, A.;Eversheim, P. D.;Faessler, M.;Ferrero, A.;Finger, M.;Finger, M.;Fischer, H.;Franco, C.;du Fresne von Hohenesche, N.;Friedrich, J. M.;Frolov, V.;Gautheron, F.;Gavrichtchouk, O. P.;Gerassimov, S.;Giarra, J.;Gnesi, I.;Gorzellik, M.;Grasso, A.;Gridin, A.;Grosse Perdekamp, M.;Grube, B.;Guskov, A.;Hahne, D.;Hamar, G.;von Harrach, D.;Heitz, R.;Herrmann, F.;Horikawa, N.;d'Hose, N.;Hsieh, C. -Y.;Huber, S.;Ishimoto, S.;Ivanov, A.;Iwata, T.;Jary, V.;Joosten, R.;Jörg, P.;Kabuß, E.;Kerbizi, A.;Ketzer, B.;Khaustov, G. V.;Khokhlov, Yu. A.;Kisselev, Yu.;Klein, F.;Koivuniemi, J. H.;Kolosov, V. N.;Kondo, K.;Konorov, I.;Konstantinov, V. F.;Kotzinian, A. M.;Kouznetsov, O. M.;Kral, Z.;Krämer, M.;Krinner, F.;Kroumchtein, Z. V.;Kulinich, Y.;Kunne, F.;Kurek, K.;Kurjata, R. P.;Kuznetsov, I. I.;Kveton, A.;Lednev, A. A.;Levchenko, E. A.;Levorato, S.;Lian, Y. -S.;Lichtenstadt, J.;Longo, R.;Lyubovitskij, V. E.;Maggiora, A.;Magnon, A.;Makins, N.;Makke, N.;Mallot, G. K.;Mamon, S. A.;Marchand, C.;Marianski, B.;Martin, A.;Marzec, J.;Matoušek, J.;Matsuda, H.;Matsuda, T.;Meshcheryakov, G. V.;Meyer, M.;Meyer, W.;Mikhailov, Yu. V.;Mikhasenko, M.;Mitrofanov, E.;Mitrofanov, N.;Miyachi, Y.;Moretti, A.;Nagaytsev, A.;Nerling, F.;Neyret, D.;Nový, J.;Nowak, W. -D.;Nukazuka, G.;Nunes, A. S.;Olshevsky, A. G.;Orlov, I.;Ostrick, M.;Panzieri, D.;Parsamyan, B.;Paul, S.;Peng, J. -C.;Pereira, F.;Pesaro, G.;Pešek, M.;Pešková, M.;Peshekhonov, D. V.;Pierre, N.;Platchkov, S.;Pochodzalla, J.;Polyakov, V. A.;Pretz, J.;Quaresma, M.;Quintans, C.;Ramos, S.;Regali, C.;Reicherz, G.;Riedl, C.;Ryabchikov, D. I.;Rybnikov, A.;Rychter, A.;Salac, R.;Samoylenko, V. D.;Sandacz, A.;Sarkar, S.;Savin, I. A.;Sawada, T.;Sbrizzai, G.;Schiavon, P.;Schmieden, H.;Seder, E.;Selyunin, A.;Silva, L.;Sinha, L.;Sirtl, S.;Slunecka, M.;Sozzi, F.;Smolik, J.;Srnka, A.;Steffen, D.;Stolarski, M.;Subrt, O.;Sulc, M.;Suzuki, H.;Szabelski, A.;Szameitat, T.;Sznajder, P.;Tasevsky, M.;Tessaro, S.;Tessarotto, F.;Thiel, A.;Tomsa, J.;Tosello, F.;Tskhay, V.;Uhl, S.;Vasilishin, B. I.;Vauth, A.;Veit, B. M.;Veloso, J.;Vidon, A.;Virius, M.;Wallner, S.;Wilfert, M.;Windmolders, R.;Zaremba, K.;Zavada, P.;Zavertyaev, M.;Zemlyanichkina, E.;Ziembicki, M.

2018-01-01

Abstract

The K− over K+ multiplicity ratio is measured in deep-inelastic scattering, for the first time for kaons carrying a large fraction z of the virtual-photon energy. The data were obtained by the COMPASS collaboration using a 160 GeV muon beam and an isoscalar 6LiD target. The regime of deep-inelastic scattering is ensured by requiring Q2>1(GeV/c)2 for the photon virtuality and W>5GeV/c2 for the invariant mass of the produced hadronic system. Kaons are identified in the momentum range from 12 GeV/c to 40 GeV/c, thereby restricting the range in Bjorken-x to 0.010.75. For very large values of z, i.e. z>0.8, we observe the kaon multiplicity ratio to fall below the lower limits expected from calculations based on leading and next-to-leading order perturbative quantum chromodynamics. Also, the kaon multiplicity ratio shows a strong dependence on the missing mass of the single-kaon production process. This suggests that within the perturbative quantum chromodynamics formalism an additional correction may be required, which takes into account the phase space available for hadronisation.

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	Anno
	
			2018
		
	Stato di pubblicazione
	
			Pubblicato
		
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			PHYSICS LETTERS. SECTION B
		
	DOI
	
			https://dx.doi.org/10.1016/j.physletb.2018.09.052
		
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			https://www.sciencedirect.com/science/article/pii/S0370269318307536
		
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2931693

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K− over K+ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy

2018-01-01

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ArTS Archivio della ricerca di Trieste

K− over K+ multiplicity ratio for kaons produced in DIS with a large fraction of the virtual-photon energy

2018-01-01

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