scholarly journals Decisive Test of Color Coherence in Proton-Nucleus Collisions at the LHC

2013 ◽  
Vol 111 (18) ◽  
Author(s):  
Adam Bzdak ◽  
Vladimir Skokov
Keyword(s):  
Decisive Test

scholarly journals The nature of the interaction between neutron and proton from scattering experiments

1937 ◽  
Vol 163 (913) ◽  
pp. 281-297 ◽  
Keyword(s):  
Binding Energies ◽  
Energy Curve ◽  
Simple Explanation ◽  
Heavy Nuclei ◽  
Atomic Nuclei ◽  
Nuclear Disintegration ◽  
Wide Range ◽  
Decisive Test ◽  
Spherical Potential ◽  
Positive Results

Although our knowledge of atomic nuclei has expanded greatly in the last few years we are still in the lamentable position of having no certain information concerning the nature of the interaction between neutron and proton. Heisenberg’s suggestion (1932), in the form as modified by Majorana (1933), that this interaction is of an exchange nature has been much used for the discussion of the binding energies of the heavy nuclei. It has the great advantage of providing a simple explanation of the proportionality of nuclear binding energies to the number of nuclear particles, but there is no direct experimental evidence that it is correct. The simplest way in which one can hope to test any assumed form of interaction is from observation of the collisions between neutrons and protons. Unfortunately the relative velocities of the colliding particles which would give the most decisive test are not easily realized in practice, but the recent advances in the technique of nuclear disintegration have provided a source of neutrons of homogeneous velocity which may be used to give results of a higher precision and definiteness than hitherto. It is our purpose in this paper to describe the results to be expected in such experiments on the assumption of either exchange or ordinary forces, for a variety of forms of interaction. The known binding energies of the nuclei H 2 , H 3 , He 3 , He 4 enable us to restrict considerably the magnitude and range of the forces assumed, and we take account of this in all cases. It is found that there is a fair expectation of positive results from accurate experiments on the angular distribution of protons projected by neutrons of 2½ mV energy provided that the form of the interaction does not approach too closely that of the spherical potential “well”, i. e. provided there is an appreciable “tail” to the potential energy curve at large distances of separation. The calculations have not been restricted to neutrons of this particular energy but have been carried out for energies up to 20 mV. This is important in order to examine what conclusions, if any, can be derived from the experiments already carried out with neutrons, having a wide range of velocities.

Some Determinants of Marriage Stability in Busoga: A Reformulation of Gluckman's Hypothesis

Africa ◽  
1957 ◽  
Vol 27 (2) ◽  
pp. 106-123 ◽  
Author(s):  
L. A. Fallers
Keyword(s):  
Stable Marriage ◽  
Sociological Analysis ◽  
General Hypothesis ◽  
Kinship System ◽  
Marriage Stability ◽  
The Face ◽  
Decisive Test ◽  
The Stability ◽  
Opening Paragraph ◽  
Methodological Difficulties

Opening ParagraphIn a recent paper Gluckman puts forward a general hypothesis to account for the wide variation in the frequency of divorce among some African societies. Contrasting the bilateral kinship system of the Lozi of Northern Rhodesia with the strongly agnatic one of the Zulu of Natal, he notes that divorce is common among the former, rare among the latter, and suggests the general hypothesis that stable marriage is associated with patriliny. Gluckman tests this hypothesis against a substantial body of comparative data, drawn mainly from trans-Saharan Africa, and concludes that the available evidence seems generally to support it. He notes, however, that data for many areas are inadequate and he is properly cautious in the face of the methodological difficulties involved in putting such hypotheses to decisive test:I am aware of the difficulties of establishing the validity of the hypothesis, but even if it is wrong it may be useful. Some of the difficulties are inherent in sociological analysis, since in this there are always complicating variables. Others arise from the vague and embracing use of categories and concepts (of which I too am guilty) such as patrilineal, lineage, marriage, divorce, &c….I am myself uncertain whether it is the stability of people's attachment to specific areas, or patriliny or father-right itself, or the agnatic lineage, or all of these together, which, whatever the other variables are, tend to be associated with a strong marriage tie.He concludes by inviting further testing and reformulation of the hypothesis.

scholarly journals New Precision Electroweak Tests in Supergravity Models

1997 ◽  
Vol 12 (36) ◽  
pp. 2803-2811
Author(s):  
Gye T. Park ◽  
Kang Young Lee
Keyword(s):  
Supergravity Models ◽  
Standard Model ◽  
Mass Formula ◽  
Previous Analysis ◽  
Experimental Results ◽  
Scale Model ◽  
The Standard Model ◽  
Decisive Test ◽  
Experimental Values ◽  
Near Future

We update the analysis of the precision electroweak tests in terms of four epsilon parameters, ε1,2,3,b, to obtain more accurate experimental values of them by taking into account the new LEP data released at the 28th ICHEP (Poland, 1996). We also compute ε1 and εb in the context of the no-scale SU (5)× U (1) supergravity model to obtain the updated constraints by imposing the correlated constraints in terms of the experimental ellipses in the ε1–εb plane and also by imposing the new conservative bound on the lightest chargino mass, [Formula: see text]. Upon imposing these new experimental results, we find that the situations in the no-scale model are much more favorable than those in the standard model, and if mt≳ 170 GeV, then the allowed regions at the 95% C.L. in the no-scale model are tan β≳ 4 and [Formula: see text] for μ>0 (μ< 0), which are in fact much more stringent than in our previous analysis. Therefore, assuming that mt≳ 170 GeV, if the lightest chargino mass bound were to be pushed up to 82 GeV, the sign on the Higgs mixing term μ in the no-scale model could well be determined from the ε1–εb constraint to be positive at the 95% C.L. At any rate, better accuracy in the measured mt from the Tevatron in the near future combined with the LEP data is most likely to provide a decisive test of the no-scale SU (5)× U (1) supergravity model.

HIGGS BOSON DISCOVERY POTENTIAL BEYOND THE MINIMAL STANDARD MODEL

1994 ◽  
Vol 09 (11) ◽  
pp. 1747-1785 ◽  
Author(s):  
ANDRÉ SOPCZAK
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Mass Parameter ◽  
Mass Range ◽  
Higgs Bosons ◽  
The Standard Model ◽  
Charged Higgs ◽  
Discovery Potential ◽  
Decisive Test ◽  
Minimal Standard

Detailed studies of neutral and charged Higgs boson pair production with full statistic detector simulations around [Formula: see text] with 500 pb−1 are presented in the context of a review of the Higgs boson discovery potential at LEP200. Already in the first phase of LEP200, a significant increase of the mass parameter space compared to LEP1 for the discovery of nonminimal Higgs bosons will be possible, while the mass range for the discovery of the minimal Standard Model Higgs boson will increase only marginally. The requirements for a decisive test of the Minimal Supersymmetric extension of the Standard Model (MSSM) at a later stage of LEP200 are discussed. A sensitivity mass range is given for charged Higgs bosons.

scholarly journals Decisive test of superstring-inspired E(6) models

1996 ◽  
Vol 53 (3) ◽  
pp. 1586-1604 ◽  
Author(s):  
Manuel Drees ◽  
Atsushi Yamada
Keyword(s):  
Decisive Test

scholarly journals VII. On the emission velocities of photo-electrons

1913 ◽  
Vol 212 (484-496) ◽  
pp. 205-226 ◽  
Keyword(s):  
Experimental Evidence ◽  
Incident Light ◽  
Wave Length ◽  
Ultra Violet ◽  
Metallic Surfaces ◽  
Quantitative Evidence ◽  
Maximum Emission ◽  
Violet Light ◽  
Decisive Test ◽  
Electric Effect

Since the discovery of the photo-electric effect by Hertz, many experiments have been made on the emission of negative electricity from metallic surfaces when illuminated by light. Yet with regard to many important points the results are often indefinite and contradictory. Most theories of the photo-electric effect indicate definite relations between the velocity of emission of the electrons and ( a ) the nature of the metal from which they are emitted, and ( b ) the wave-length of the incident light. Up to the present, however, the experimental evidence as to these two relations must be regarded as quite inadequate to afford any decisive test between rival theories. This research was undertaken to obtain, among other things, quantitative evidence on these two relations. 2. Previous Work .— Ladenburg made some valuable experiments on the velocity with which electrons are emitted from metals when illuminated by ultra-violet light. He concluded that the maximum emission velocity was inversely proportional to the wave-length. The velocity varied from metal to metal; thus, for light of wave­ length λ 2010, the maximum emission velocity (measured in volts) for platinum was 1·86 volts, and for zinc 1·12 volts. The source of light used by Ladenburg was a mercury arc. His metals were polished with emery and oil, and were exposed to the atmosphere for some time before the apparatus for measuring the velocity could be exhausted.

A decisive test for the general relativity

1971 ◽  
Vol 12 (1) ◽  
pp. 219-242 ◽  
Author(s):  
A. Blokland
Keyword(s):  
General Relativity ◽  
Decisive Test

scholarly journals RECONCILING THE POSITIVE DAMA ANNUAL MODULATION SIGNAL WITH THE NEGATIVE RESULTS OF THE CDMS II EXPERIMENT

2004 ◽  
Vol 19 (24) ◽  
pp. 1841-1846 ◽  
Author(s):  
R. FOOT
Keyword(s):  
Dark Matter ◽  
Positive Result ◽  
Lower Threshold ◽  
Annual Modulation ◽  
Null Results ◽  
Negative Results ◽  
Modulation Signal ◽  
Decisive Test ◽  
Light Target ◽  
Mirror Matter

We examine the recent CDMS II results in the context of the mirror matter interpretation of the DAMA/NaI experiment. We find that the favoured mirror matter interpretation of the DAMA/NaI experiment — a He ′/ H ′-dominated halo with a small O ′ component is fully consistent with the null results reported by CDMS II. While the CDMS II experiment is quite sensitive to a heavy Fe ′ component, and may yet find a positive result, a more decisive test of mirror matter-type dark matter would require a lower threshold experiment using light target elements.

Sign in / Sign up

Export Citation Format

Share Document