Kaon pair production close to threshold

Winter, P.; Wolke, M.; Adam, H.-H.; Budzanowski, A.; Czyzykiewicz, R.; Grzonka, D.; Janusz, M.; Jarczyk, L.; Kamys, B.; Khoukaz, A.; Kilian, K.; Klaja, P.; Moskal, P.; Oelert, W.; Piskor-Ignatowicz, C.; Przerwa, J.; Ritman, J.; Rożek, T.; Sefzick, T.; Siemaszko, M.; Smyrski, J.; Täschner, A.; Wüstner, P.; Zhang, Z.; Zipper, W.

doi:10.1016/j.physletb.2006.02.037

Cited by 40 publications

(69 citation statements)

References 45 publications

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“…Figure 4. The pp → ppK + K − excitation function obtained from previous experiments [11,[24][25][26][27][28], together with the present upper limit of the total cross section. The dotted line presents an energy dependence according the phase space volume, the dotted-dashed line incorporates the pp-FSI, the dashed line includes additionally the pK − -FSI and solid line is obtained by taking into account also the K + K − interaction.…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

Near-threshold charged kaon pair production in two protons collisions

Gil

Smyrski

2016

EPJ Web Conf.

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Abstract. The pp → ppK + K − reaction was measured near threshold at excess energy Q = 4.5 MeV using the COSY-11 detection system installed at the COSY-Juelich accelerator. Preliminary value of upper limit of the total cross section was determined. This limit indicates that an enhancement of the total cross section close to the threshold, caused by the final state interaction, is smaller than suggested by extrapolation of data measured at higher energies. Physics motivationThe energy dependence of the pp → ppK + K − total cross section close to threshold is very sensitive to the interactions between particles in the final state, and therefore is well suited for studies of these interactions. There are many interesting topics connected with the interactions of the final state kaons and protons. For example, the K + K − interaction is crucial for understanding the structure of the scalar mesons f 0 (980) and a 0 (980), which according Ref. [1,2] are KK molecules. In turn, the K − p interaction is interesting from the point of view of study the nature of the Λ(1405) hyperon, which is considered as a K − p molecular state [3]. There are also some astrophysical aspects of studying kaons production reactions, like description of neutron stars structure [4]. Elementary reactions of kaon pair production in pp collisions are also important for better understanding of the properties of kaons inside dense baryonic matter [5]. The existing data for the kaon pair production in pp collisions were measured for excess energies higher than Q = 6 MeV, with exception of one point at 3 MeV, for which only upper limit of the total cross section was determined. On the other hand, data very close to threshold (for Q < 6 MeV) are crucial for distinguishing between various models of the final state interaction (FSI) in the ppK + K − system. Therefore, we performed a high luminosity measurement at Q = 4.5 MeV. ExperimentThe measurement was performed with the COSY-11 detection system, described in details in Ref. [6], at the COSY-Juelich accelerator. A principle of the measurement is presented in Fig. 1. Internal proton beam of the COSY was scattered on the COSY-11 H 2 cluster target. The beam momentum

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Section: Data Analysis and Resultsmentioning

confidence: 99%

Near-threshold charged kaon pair production in two protons collisions

Gil

Smyrski

2016

EPJ Web Conf.

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“…The additional broad structure seen in the upper panel of Fig. 2 is partly due to the pp → ppπ + X − reaction, where the π + was misidentified as a K + meson, and in part due to the K + meson production associated with the hyperons Λ(1405) or Σ(1385) [5,6]. The background, however, can be completely reduced by demanding a signal in the silicon pad detectors (mounted inside the dipole) at the position where the K − meson originating from the pp → ppK + K − reaction is expected (lower panel of Figure 2).…”

Section: Measurements Of the Ppmentioning

confidence: 99%

“…The background, however, can be completely reduced by demanding a signal in the silicon pad detectors (mounted inside the dipole) at the position where the K − meson originating from the pp → ppK + K − reaction is expected (lower panel of Figure 2). This clear identification allows to select events originating from the pp → ppK + K − reaction and to determine the total and differen- The data are form references [4,5,6,7,9] and the meaning of the lines is described in the text.…”

Section: Measurements Of the Ppmentioning

confidence: 99%

“…Recent results obtained by the ANKE collaboration with much higher statistics can also be explained without the need of referring to the scalars f 0 or a 0 [7,8]. However, the systematic collection of data below [4,5,6] and above [7,9] the φ meson threshold combined together reveal a significant signal in the shape of the excitation function in which the K − p and perhaps also the K + K − interaction manifests itself. These observations motivate us to search for a signal from the interaction between the K + and K − in two dimensional invariant mass distributions.…”

Section: Introductionmentioning

confidence: 99%

“…full space phase coverage achievable with dipole magnetic spectrometers rather limited in geometrical acceptance. Early experiments on K + K − pair production at COSY conducted by the COSY-11 collaboration revealed, however, that the total cross section at threshold is by more than seven orders of magnitude smaller than the total proton-proton production cross section making the study difficult due to low statistics [4,5,6]. A possible influence from the f 0 or a 0 mesons on the K + K − pair production appeared to be too weak to be distinguished from the direct production of these mesons based on the COSY-11 data [5].…”

Section: Introductionmentioning

confidence: 99%

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Study of the hadronic production of kaon pairs below the threshold for the ϕ meson

Moskal

Silarski

Budzanowski

et al. 2008

Nuclear Physics B - Proceedings Supplements

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The near threshold production of K + K − pairs in proton-proton collisions has been investigated at the cooler synchrotron COSY below and above the threshold for the φ meson using the COSY-11 and ANKE facilities, respectively. The excitation function determined for the pp → ppK + K − reaction revealed a statistically significant enhancement close to the threshold which may plausibly be assigned to the influence of the K − p interaction. In addition, observed consistently by both groups, a strong enhancement at low values of the ratio of the K − p to K + p invariant mass distributions shows that the proton interacts much stronger with K − than with K + . In this report we focus on the measurements performed by the COSY-11 collaboration. We explain the experimental method used and present main results of completed analyses as well as a new qualitative elaboration of the ppK + K − events population on the Goldhaber plot. We conclude with the observation that event densities increase at the region where the influence from the K + K − interaction is expected.

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Overview of COSY

Eyrich

The IVth International Conference on Quarks and Nuclear Physics

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Kaon pair production close to threshold

Cited by 40 publications

References 45 publications

Near-threshold charged kaon pair production in two protons collisions

Near-threshold charged kaon pair production in two protons collisions

Study of the hadronic production of kaon pairs below the threshold for the ϕ meson

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