首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 12 毫秒
1.
We measured the total cross section for pp scattering at s = 52.8 GeV at the CERN ISR, using the direct, total-rate method. The result obtained, σtot(pp) = 44.70 ± 0.53 mb, shows that, in common with σtot(pp), this cross section also starts to rise in the ISR energy range. We remeasured the total cross section for pp scattering at the same energy, obtaining σtot(pp) = 43.26 ± 0.33 mb, and found for the difference, Δσtot = σtot(pp) ? σtot(pp), a value of 1.44±0.45 mb.  相似文献   

2.
Proton-proton elastic scattering has been measured over the angular range 7 to 16 mrad at centre-of-mass energies of 31, 45 and 53 GeV using the CERN Intersecting Storage Rings. The results indicate that the diffraction peak has continued to shrink with increasing energy, but not as fast as suggested by the results at lower energies.  相似文献   

3.
4.
《Physics Reports》1987,144(2):51-115
The storing of antiprotons in the CERN ISR allowed the comparison of proton-proton and proton-antiproton interactions through a variety of reactions ranging from total cross section measurements to hard scattering processes. This article reviews the results obtained at the ISR on such comparisons.  相似文献   

5.
6.
The production of a Λ+c charmed baryon has been observed in pp collisions at the CERN ISR. A sharp peak at 2.26 GeV/c2 was found in the decay mode Λ+cK10p in events triggered with a forward K? meson. Also the decay mode Λ+c → K? Δ++ seems to be present. The estimation of the total cross section for Λ+c production is given. However, the resulting value depends on the assumed form of the differential cross section. In addition, Λ+c production in events triggered by the presence of a direct electron is discussed.  相似文献   

7.
We present a measurement of the total cross section σt in proton-proton collisions at the CERN ISR. The method involves determination of the total interaction rate and machine luminosity. A two-arm scintillation hodoscope observes ~ 90% of the total interaction rate, while a streamer chamber is employed for event topologies missed by the main trigger. An increase of about 10% in σt is observed in the energy range √s = 23.6 to √s = 62.8 GeV/c in agreement with previous experiments.  相似文献   

8.
No quark candidates have been seen among 0.6 × 109 charged particles at the ISR. The corresponding cross-section limit for charge for quark masses up to 22(13) GeV, assuming PT = 0.4 GeV/c.  相似文献   

9.
Many-particle rapidity correlations have been studied for αα,dd, andpp interactions at the CERN Intersecting Storage Rings using the Split-Field Magnet detector, and basing the investigating on the distributions of rapidity gaps between particles. In the framework of a simple cluster model, it is found that all the data samples have similar features and that the events contain clusters of two different types.  相似文献   

10.
A search for massive photon pair production at \(\sqrt s = 63 GeV\) has been carried out on the data sample previously employed for the electron pair production study. Positive evidence is reported form γγ>6GeV, with a production cross-section similar to Drell-Yan electron pairs. The ratio γγ/π0π0 was measured to be ~10?3 for ap T of each γ or γ or π0 above 3 GeV/c.  相似文献   

11.
We observed the process αα→ααX in which the α′s were emitted uncorrelated in the forward direction and the charged component of the clusterX was confined to a limited portion (|η|?2) of the central region. We identified such reactions as being due to double-Pomeron exchange, for which we found a cross-section of (720±140)μb. The raw mean charged multiplicity of the clusterX was found to be 6.76±0.07 with a dispersionD=4.8. The measurements were performed at the CERN ISR at a centre-of-mass energy of \(\sqrt s = 126\) GeV. Similarities are drawn between double-Pomeron exchange in αα and inpp collisions.  相似文献   

12.
We study the production of identified charged particles in pp collisions at a c.m. energy of 63 GeV in events with an identified high-pT trigger particle. The measurements were performed at the CERN Intersecting Storage Rings using the Axial Field Spectrometer.Production ratios are presented as a function of pT in the range 2.5 to 8 GeV/c.  相似文献   

13.
We measured the elastic scattering of αα ats = 126 GeV and of αp at s = 89 GeV. For αα, the differential cross section dσ/dt has a diffractive pattern minima at |t| = 0.10 and 0.38 GeV2. At small |t| = 0.05?0.07 GeV2, this cross section behaves like exp[(100 ± 10) t]. Extrapolating a fit to the data to the optical point, we obtained for the total cross section αtot(αα) = 250 ± 50 mb and an integrated elastic cross section σe1(αα) = 45 ± mb. Another method of estimating σtot(αα), based on measuring the interaction rate, yielded 295 ± 40 mb. For αp, dσ/dt has aminimum at |t| = 0.20 GeV2, and for 0.05 < |t| < 0.18 GeV2 behaves like exp[(41 ± 2) t]. Extrapolating this slope to |t| = 0, we found σtot(αp) = 130 ± 20 and σe1(αp) = 20 ± 4mb. Results on pp elastic scattering at s = 63 GeV agree with previous ISR experiments.  相似文献   

14.
We report results on a new measurement of the double diffractive reaction pp → (pπ+π?) (pπ+π?) at the ISR obtained with the Split Field Magnet detector. Experimental procedures and data analysis are discussed in detail. The cross section measured at the five standard ISR energies exhibits an increase of (55 ± 7)% in the s-range from 549 to 3892 GeV2.  相似文献   

15.
Data are reported on the momentum distributions of Λ, Λ (1520), φ (1020), Λandp, inclusively produced between 1° and 2° with respect to one of the primary proton beams at the CERN Intersecting Storage Rings. In addition, the decay angular distribution of the Λ(1520), the ratio of the cross sections for the production of Σ? (1385) and Σ+ (1385) and the ratios among different charge states of the pairs Λπ, ΛK, Δ++ (1232)π and ππ have been measured. These data are confronted with current ideas on fragmentation.  相似文献   

16.
Production of charmed particles has been investigated at √s = 63 GeV usi ng the Lampshade Magnet detector triggered by electrons and positrons emitted at 30% from the ISR beam axis. The results of a search for Λc and Λc signals in the K?+ and K+pπ? channels are presented. Cross sections for the reactions pp → DΛcX and pp → ΛcΛcX, and upper limits. for pp → DDX, are evaluated under various models and compared with other values obtained at the ISR.  相似文献   

17.
18.
The real part of the proton proton elastic scattering amplitude has been determined from its interference with the Coulomb amplitude at total centre-of-mass energies up to 62 GeV. The observed steady increase of ? with energy indicates that the total proton proton cross section continues to increase well beyond this energy.  相似文献   

19.
We study the behaviour of σppT at ISR energies in the Reggeon calculus with a bare triple Pomeron coupling non vanishing at q2 = 0. The parameters are determined from elastic and inclusive data. A sizable increase of σT with s can only be obtained when the bare Pomeron intercept is such that the renormalized Pomeron singularity is above one, in the forward direction.  相似文献   

20.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号