1 package org.lcsim.mc.fast.tracking;
2
3 import hep.physics.matrix.SymmetricMatrix;
4 import hep.physics.vec.Hep3Vector;
5
6 interface TrackParameters extends Hep3Vector {
7 double getD0();
8
9 /**
10 * Get the error matrix
11 * @see #getTrackParameter
12 */
13 SymmetricMatrix getErrorMatrix();
14
15 double[] getMomentum();
16
17 double getOmega();
18
19 double getPX();
20
21 double getPY();
22
23 double getPZ();
24
25 double getPhi0();
26
27 double getPtot();
28
29 double getTanL();
30
31 /**
32 * Get an individual track parameter. <br>
33 *
34 * The track parameters for LCD are defined as follows
35 * <table>
36 * <tr>
37 * <th>Index</th>
38 * <th>Meaning</th>
39 * </tr>
40 * <tr>
41 * <td>0</td>
42 * <td>d0 = XY impact parameter</td>
43 * <tr>
44 * <tr>
45 * <td>1</td>
46 * <td>phi0</td>
47 * <tr>
48 * </td>
49 * <tr>
50 * <tr>
51 * <td>2</td>
52 * <td>omega = 1/curv.radius (negative for q/abs(q) > 0)</td>
53 * <tr>
54 * <tr>
55 * <td>3</td>
56 * <td>z0 = z of track (z impact parameter)</td>
57 * <tr>
58 * <tr>
59 * <td>4</td>
60 * <td>s = tan lambda</td>
61 * <tr>
62 * </table>
63 * @param i The index of the track parameter
64 * @return The track parameter with the specified index
65 */
66 double getTrackParameter(int i);
67
68 /**
69 * Get the track parameters as an array
70 * @see #getTrackParameter
71 */
72 double[] getTrackParameters();
73
74 int getUnitCharge();
75
76 double getZ0();
77 }