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29 | ||
30 | <h2>Fragmentation</h2> | |
31 | ||
32 | Fragmentation in PYTHIA is based on the Lund string model | |
33 | [<a href="Bibliography.php" target="page">And83, Sjo84</a>]. Several different aspects are involved in | |
34 | the physics description, which here therefore is split accordingly. | |
35 | This also, at least partly, reflect the set of classes involved in | |
36 | the fragmentation machinery. | |
37 | ||
38 | <p/> | |
39 | The variables collected here have a very wide span of usefulness. | |
40 | Some would be central in any hadronization tuning exercise, others | |
41 | should not be touched except by experts. | |
42 | ||
43 | <p/> | |
44 | The fragmentation flavour-choice machinery is also used in a few | |
45 | other places of the program, notably particle decays, and is thus | |
46 | described on the separate <?php $filepath = $_GET["filepath"]; | |
47 | echo "<a href='FlavourSelection.php?filepath=".$filepath."' target='page'>";?>Flavour | |
48 | Selection</a> page. | |
49 | ||
50 | <h3>Fragmentation functions</h3> | |
51 | ||
52 | The <code>StringZ</code> class handles the choice of longitudinal | |
53 | lightcone fraction <i>z</i> according to one of two possible | |
54 | shape sets. | |
55 | ||
56 | <p/> | |
57 | The Lund symmetric fragmentation function [<a href="Bibliography.php" target="page">And83</a>] is the | |
58 | only alternative for light quarks. It is of the form | |
59 | <br/><i> | |
60 | f(z) = (1/z) * (1-z)^a * exp(-b m_T^2 / z) | |
61 | </i><br/> | |
62 | with the two main free parameters <i>a</i> and <i>b</i> to be | |
63 | tuned to data. They are stored in | |
64 | ||
65 | <br/><br/><table><tr><td><strong>StringZ:aLund </td><td></td><td> <input type="text" name="1" value="0.3" size="20"/> (<code>default = <strong>0.3</strong></code>; <code>minimum = 0.0</code>; <code>maximum = 2.0</code>)</td></tr></table> | |
66 | The <i>a</i> parameter of the Lund symmetric fragmentation function. | |
67 | ||
68 | ||
69 | <br/><br/><table><tr><td><strong>StringZ:bLund </td><td></td><td> <input type="text" name="2" value="0.8" size="20"/> (<code>default = <strong>0.8</strong></code>; <code>minimum = 0.2</code>; <code>maximum = 2.0</code>)</td></tr></table> | |
70 | The <i>b</i> parameter of the Lund symmetric fragmentation function. | |
71 | ||
72 | ||
73 | <p/> | |
74 | In principle, each flavour can have a different <i>a</i>. Then, | |
75 | for going from an old flavour <i>i</i> to a new <i>j</i> one | |
76 | the shape is | |
77 | <br/><i> | |
78 | f(z) = (1/z) * z^{a_i} * ((1-z)/z)^{a_j} * exp(-b * m_T^2 / z) | |
79 | </i><br/> | |
80 | This is only implemented for diquarks relative to normal quarks: | |
81 | ||
82 | <br/><br/><table><tr><td><strong>StringZ:aExtraDiquark </td><td></td><td> <input type="text" name="3" value="0.5" size="20"/> (<code>default = <strong>0.5</strong></code>; <code>minimum = 0.0</code>; <code>maximum = 2.0</code>)</td></tr></table> | |
83 | allows a larger <i>a</i> for diquarks, with total | |
84 | <i>a = aLund + aExtraDiquark</i>. | |
85 | ||
86 | ||
87 | <p/> | |
88 | Finally, the Bowler modification [<a href="Bibliography.php" target="page">Bow81</a>] introduces an extra | |
89 | factor | |
90 | <br/><i> | |
91 | 1/z^{r_Q * b * m_Q^2} | |
92 | </i><br/> | |
93 | for heavy quarks. To keep some flexibility, a multiplicative factor | |
94 | <i>r_Q</i> is introduced, which ought to be unity (provided that | |
95 | quark masses were uniquely defined) but can be set in | |
96 | ||
97 | <br/><br/><table><tr><td><strong>StringZ:rFactC </td><td></td><td> <input type="text" name="4" value="1.0" size="20"/> (<code>default = <strong>1.0</strong></code>; <code>minimum = 0.0</code>; <code>maximum = 2.0</code>)</td></tr></table> | |
98 | <i>r_c</i>, i.e. the above parameter for <i>c</i> quarks. | |
99 | ||
100 | ||
101 | <br/><br/><table><tr><td><strong>StringZ:rFactB </td><td></td><td> <input type="text" name="5" value="0.67" size="20"/> (<code>default = <strong>0.67</strong></code>; <code>minimum = 0.0</code>; <code>maximum = 2.0</code>)</td></tr></table> | |
102 | <i>r_b</i>, i.e. the above parameter for <i>b</i> quarks. | |
103 | ||
104 | ||
105 | <br/><br/><table><tr><td><strong>StringZ:rFactH </td><td></td><td> <input type="text" name="6" value="1.0" size="20"/> (<code>default = <strong>1.0</strong></code>; <code>minimum = 0.0</code>; <code>maximum = 2.0</code>)</td></tr></table> | |
106 | <i>r_h</i>, i.e. the above parameter for heavier hypothetical quarks, | |
107 | or in general any new coloured particle long-lived enough to hadronize. | |
108 | ||
109 | ||
110 | <p/> | |
111 | As an alternative, it is possible to switch over to the | |
112 | Peterson/SLAC formula [<a href="Bibliography.php" target="page">Pet83</a>] | |
113 | <br/><i> | |
114 | f(z) = 1 / ( z * (1 - 1/z - epsilon/(1-z))^2 ) | |
115 | </i><br/> | |
116 | for charm, bottom and heavier (defined as above) by the three flags | |
117 | ||
118 | <br/><br/><strong>StringZ:usePetersonC</strong> <input type="radio" name="7" value="on"><strong>On</strong> | |
119 | <input type="radio" name="7" value="off" checked="checked"><strong>Off</strong> | |
120 | (<code>default = <strong>off</strong></code>)<br/> | |
121 | use Peterson for <i>c</i> quarks. | |
122 | ||
123 | ||
124 | <br/><br/><strong>StringZ:usePetersonB</strong> <input type="radio" name="8" value="on"><strong>On</strong> | |
125 | <input type="radio" name="8" value="off" checked="checked"><strong>Off</strong> | |
126 | (<code>default = <strong>off</strong></code>)<br/> | |
127 | use Peterson for <i>b</i> quarks. | |
128 | ||
129 | ||
130 | <br/><br/><strong>StringZ:usePetersonH</strong> <input type="radio" name="9" value="on"><strong>On</strong> | |
131 | <input type="radio" name="9" value="off" checked="checked"><strong>Off</strong> | |
132 | (<code>default = <strong>off</strong></code>)<br/> | |
133 | use Peterson for hypothetical heavier quarks. | |
134 | ||
135 | ||
136 | <p/> | |
137 | When switched on, the corresponding epsilon values are chosen to be | |
138 | ||
139 | <br/><br/><table><tr><td><strong>StringZ:epsilonC </td><td></td><td> <input type="text" name="10" value="0.05" size="20"/> (<code>default = <strong>0.05</strong></code>; <code>minimum = 0.01</code>; <code>maximum = 0.25</code>)</td></tr></table> | |
140 | <i>epsilon_c</i>, i.e. the above parameter for <i>c</i> quarks. | |
141 | ||
142 | ||
143 | <br/><br/><table><tr><td><strong>StringZ:epsilonB </td><td></td><td> <input type="text" name="11" value="0.005" size="20"/> (<code>default = <strong>0.005</strong></code>; <code>minimum = 0.001</code>; <code>maximum = 0.025</code>)</td></tr></table> | |
144 | <i>epsilon_b</i>, i.e. the above parameter for <i>b</i> quarks. | |
145 | ||
146 | ||
147 | <br/><br/><table><tr><td><strong>StringZ:epsilonH </td><td></td><td> <input type="text" name="12" value="0.005" size="20"/> (<code>default = <strong>0.005</strong></code>; <code>minimum = 0.0001</code>; <code>maximum = 0.25</code>)</td></tr></table> | |
148 | <i>epsilon_h</i>, i.e. the above parameter for hypothetical heavier | |
149 | quarks, normalized to the case where <i>m_h = m_b</i>. The actually | |
150 | used parameter is then <i>epsilon = epsilon_h * (m_b^2 / m_h^2)</i>. | |
151 | This allows a sensible scaling to a particle with an unknown higher | |
152 | mass without the need for a user intervention. | |
153 | ||
154 | ||
155 | <h3>Fragmentation <i>pT</i></h3> | |
156 | ||
157 | The <code>StringPT</code> class handles the choice of fragmentation | |
158 | <i>pT</i>. At each string breaking the quark and antiquark of the pair are | |
159 | supposed to receive opposite and compensating <i>pT</i> kicks according | |
160 | to a Gaussian distribution in <i>p_x</i> and <i>p_y</i> separately. | |
161 | Call <i>sigma_q</i> the width of the <i>p_x</i> and <i>p_y</i> | |
162 | distributions separately, i.e. | |
163 | <br/><i> | |
164 | d(Prob) = exp( -(p_x^2 + p_y^2) / 2 sigma_q^2). | |
165 | </i><br/> | |
166 | Then the total squared width is | |
167 | <br/><i> | |
168 | <pT^2> = <p_x^2> + <p_y^2> = 2 sigma_q^2 = sigma^2. | |
169 | </i><br/> | |
170 | It is this latter number that is stored in | |
171 | ||
172 | <br/><br/><table><tr><td><strong>StringPT:sigma </td><td></td><td> <input type="text" name="13" value="0.304" size="20"/> (<code>default = <strong>0.304</strong></code>; <code>minimum = 0.0</code>; <code>maximum = 1.0</code>)</td></tr></table> | |
173 | the width <i>sigma</i> in the fragmentation process. | |
174 | ||
175 | ||
176 | <p/> | |
177 | Since a normal hadron receives <i>pT</i> contributions for two string | |
178 | breakings, it has a <i><p_x^2>_had = <p_y^2>_had = sigma^2</i>, | |
179 | and thus <i><pT^2>_had = 2 sigma^2</i>. | |
180 | ||
181 | <p/> | |
182 | Some studies on isolated particles at LEP has indicated the need for | |
183 | a slightly enhanced rate in the high-<i>pT</i> tail of the above | |
184 | distribution. This would have to be reviewed in the context of a | |
185 | complete retune of parton showers and hadronization, but for the | |
186 | moment we stay with the current recipe, to boost the above <i>pT</i> | |
187 | by a factor <i>enhancedWidth</i> for a small fraction | |
188 | <i>enhancedFraction</i> of the breakups, where | |
189 | ||
190 | <br/><br/><table><tr><td><strong>StringPT:enhancedFraction </td><td></td><td> <input type="text" name="14" value="0.01" size="20"/> (<code>default = <strong>0.01</strong></code>; <code>minimum = 0.0</code>; <code>maximum = 1.</code>)</td></tr></table> | |
191 | <i>enhancedFraction</i>,the fraction of string breaks with enhanced | |
192 | width. | |
193 | ||
194 | ||
195 | <br/><br/><table><tr><td><strong>StringPT:enhancedWidth </td><td></td><td> <input type="text" name="15" value="2.0" size="20"/> (<code>default = <strong>2.0</strong></code>; <code>minimum = 1.0</code>; <code>maximum = 10.0</code>)</td></tr></table> | |
196 | <i>enhancedWidth</i>,the enhancement of the width in this fraction. | |
197 | ||
198 | ||
199 | <h3>Jet joining procedure</h3> | |
200 | ||
201 | String fragmentation is carried out iteratively from both string ends | |
202 | inwards, which means that the two chains of hadrons have to be joined up | |
203 | somewhere in the middle of the event. This joining is described by | |
204 | parameters that in principle follows from the standard fragmentation | |
205 | parameters, but in a way too complicated to parametrize. The dependence | |
206 | is rather mild, however, so for a sensible range of variation the | |
207 | parameters in this section should not be touched. | |
208 | ||
209 | <br/><br/><table><tr><td><strong>StringFragmentation:stopMass </td><td></td><td> <input type="text" name="16" value="1.0" size="20"/> (<code>default = <strong>1.0</strong></code>; <code>minimum = 0.0</code>; <code>maximum = 2.0</code>)</td></tr></table> | |
210 | Is used to define a <i>W_min = m_q1 + m_q2 + stopMass</i>, | |
211 | where <i>m_q1</i> and <i>m_q2</i> are the masses of the two | |
212 | current endpoint quarks or diquarks. | |
213 | ||
214 | ||
215 | <br/><br/><table><tr><td><strong>StringFragmentation:stopNewFlav </td><td></td><td> <input type="text" name="17" value="2.0" size="20"/> (<code>default = <strong>2.0</strong></code>; <code>minimum = 0.0</code>; <code>maximum = 2.0</code>)</td></tr></table> | |
216 | Add to <i>W_min</i> an amount <i>stopNewFlav * m_q_last</i>, | |
217 | where <i>q_last</i> is the last <i>q qbar</i> pair produced | |
218 | between the final two hadrons. | |
219 | ||
220 | ||
221 | <br/><br/><table><tr><td><strong>StringFragmentation:stopSmear </td><td></td><td> <input type="text" name="18" value="0.2" size="20"/> (<code>default = <strong>0.2</strong></code>; <code>minimum = 0.0</code>; <code>maximum = 0.5</code>)</td></tr></table> | |
222 | The <i>W_min</i> above is then smeared uniformly in the range | |
223 | <i>W_min_smeared = W_min * [ 1 - stopSmear, 1 + stopSmear ]</i>. | |
224 | ||
225 | ||
226 | <p/> | |
227 | This <i>W_min_smeared</i> is then compared with the current remaining | |
228 | <i>W_transverse</i> to determine if there is energy left for further | |
229 | particle production. If not, i.e. if | |
230 | <i>W_transverse < W_min_smeared</i>, the final two particles are | |
231 | produced from what is currently left, if possible. (If not, the | |
232 | fragmentation process is started over.) | |
233 | ||
234 | <h3>Simplifying systems</h3> | |
235 | ||
236 | There are a few situations when it is meaningful to simplify the | |
237 | original task, one way or another. | |
238 | ||
239 | <br/><br/><table><tr><td><strong>HadronLevel:mStringMin </td><td></td><td> <input type="text" name="19" value="1." size="20"/> (<code>default = <strong>1.</strong></code>; <code>minimum = 0.5</code>; <code>maximum = 1.5</code>)</td></tr></table> | |
240 | Decides whether a partonic system should be considered as a normal | |
241 | string or a ministring, the latter only producing one or two primary | |
242 | hadrons. The system mass should be above <i>mStringMin</i> plus the | |
243 | sum of quark/diquark constituent masses for a normal string description, | |
244 | else the ministring scenario is used. | |
245 | ||
246 | ||
247 | <br/><br/><table><tr><td><strong>FragmentationSystems:mJoin </td><td></td><td> <input type="text" name="20" value="0.3" size="20"/> (<code>default = <strong>0.3</strong></code>; <code>minimum = 0.2</code>; <code>maximum = 1.</code>)</td></tr></table> | |
248 | When two colour-connected partons are very nearby, with at least | |
249 | one being a gluon, they can be joined into one, to avoid technical | |
250 | problems of very small string regions. The requirement for joining is | |
251 | that the invariant mass of the pair is below <i>mJoin</i>, where a | |
252 | gluon only counts with half its momentum, i.e. with its contribution | |
253 | to the string region under consideration. (Note that, for technical | |
254 | reasons, the 0.2 GeV lower limit is de facto hardcoded.) | |
255 | ||
256 | ||
257 | <br/><br/><table><tr><td><strong>FragmentationSystems:mJoinJunction </td><td></td><td> <input type="text" name="21" value="1.0" size="20"/> (<code>default = <strong>1.0</strong></code>; <code>minimum = 0.5</code>; <code>maximum = 2.</code>)</td></tr></table> | |
258 | When the invariant mass of two of the quarks in a three-quark junction | |
259 | string system becomes too small, the system is simplified to a | |
260 | quark-diquark simple string. The requirement for this simplification | |
261 | is that the diquark mass, minus the two quark masses, falls below | |
262 | <i>mJoinJunction</i>. Gluons on the string between the junction and | |
263 | the respective quark, if any, are counted as part of the quark | |
264 | four-momentum. Those on the two combined legs are clustered with the | |
265 | diquark when it is formed. | |
266 | ||
267 | ||
268 | <h3>Ministrings</h3> | |
269 | ||
270 | The <code>MiniStringFragmentation</code> machinery is only used when a | |
271 | string system has so small invariant mass that normal string fragmentation | |
272 | is difficult/impossible. Instead one or two particles are produced, | |
273 | in the former case shuffling energy-momentum relative to another | |
274 | colour singlet system in the event, while preserving the invariant | |
275 | mass of that system. With one exception parameters are the same as | |
276 | defined for normal string fragmentation, to the extent that they are | |
277 | at all applicable in this case. | |
278 | ||
279 | A discussion of the relevant physics is found in [<a href="Bibliography.php" target="page">Nor00</a>]. | |
280 | The current implementation does not completely abide to the scheme | |
281 | presented there, however, but has in part been simplified. (In part | |
282 | for greater clarity, in part since the class is not quite finished yet.) | |
283 | ||
284 | <br/><br/><table><tr><td><strong>MiniStringFragmentation:nTry </td><td></td><td> <input type="text" name="22" value="2" size="20"/> (<code>default = <strong>2</strong></code>; <code>minimum = 1</code>; <code>maximum = 10</code>)</td></tr></table> | |
285 | Whenever the machinery is called, first this many attempts are made | |
286 | to pick two hadrons that the system fragments to. If the hadrons are | |
287 | too massive the attempt will fail, but a new subsequent try could | |
288 | involve other flavour and hadrons and thus still succeed. | |
289 | After <i>nTry</i> attempts, instead an attempt is made to produce a | |
290 | single hadron from the system. Should also this fail, some further | |
291 | attempts at obtaining two hadrons will be made before eventually | |
292 | giving up. | |
293 | ||
294 | ||
295 | <h3>Junction treatment</h3> | |
296 | ||
297 | A junction topology corresponds to an Y arrangement of strings | |
298 | i.e. where three string pieces have to be joined up in a junction. | |
299 | Such topologies can arise if several valence quarks are kicked out | |
300 | from a proton beam, or in baryon-number-violating SUSY decays. | |
301 | Special attention is necessary to handle the region just around | |
302 | the junction, where the baryon number topologically is located. | |
303 | The junction fragmentation scheme is described in [<a href="Bibliography.php" target="page">Sjo03</a>]. | |
304 | The parameters in this section should not be touched except by experts. | |
305 | ||
306 | <br/><br/><table><tr><td><strong>StringFragmentation:eNormJunction </td><td></td><td> <input type="text" name="23" value="2.0" size="20"/> (<code>default = <strong>2.0</strong></code>; <code>minimum = 0.5</code>; <code>maximum = 10</code>)</td></tr></table> | |
307 | Used to find the effective rest frame of the junction, which is | |
308 | complicated when the three string legs may contain additional | |
309 | gluons between the junction and the endpoint. To this end, | |
310 | a pull is defined as a weighed sum of the momenta on each leg, | |
311 | where the weight is <i>exp(- eSum / eNormJunction)</i>, with | |
312 | <i>eSum</i> the summed energy of all partons closer to the junction | |
313 | than the currently considered one (in the junction rest frame). | |
314 | Should in principle be (close to) <i>sqrt((1 + a) / b)</i>, with | |
315 | <i>a</i> and <i>b</i> the parameters of the Lund symmetric | |
316 | fragmentation function. | |
317 | ||
318 | ||
319 | <br/><br/><table><tr><td><strong>StringFragmentation:eBothLeftJunction </td><td></td><td> <input type="text" name="24" value="1.0" size="20"/> (<code>default = <strong>1.0</strong></code>; <code>minimum = 0.5</code>)</td></tr></table> | |
320 | Retry (up to 10 times) when the first two considered strings in to a | |
321 | junction both have a remaining energy (in the junction rest frame) | |
322 | above this number. | |
323 | ||
324 | ||
325 | <br/><br/><table><tr><td><strong>StringFragmentation:eMaxLeftJunction </td><td></td><td> <input type="text" name="25" value="10.0" size="20"/> (<code>default = <strong>10.0</strong></code>; <code>minimum = 0.</code>)</td></tr></table> | |
326 | Retry (up to 10 times) when the first two considered strings in to a | |
327 | junction has a highest remaining energy (in the junction rest frame) | |
328 | above a random energy evenly distributed between | |
329 | <i>eBothLeftJunction</i> and | |
330 | <i>eBothLeftJunction + eMaxLeftJunction</i> | |
331 | (drawn anew for each test). | |
332 | ||
333 | ||
334 | <br/><br/><table><tr><td><strong>StringFragmentation:eMinLeftJunction </td><td></td><td> <input type="text" name="26" value="0.2" size="20"/> (<code>default = <strong>0.2</strong></code>; <code>minimum = 0.</code>)</td></tr></table> | |
335 | Retry (up to 10 times) when the invariant mass-squared of the final leg | |
336 | and the leftover momentum of the first two treated legs falls below | |
337 | <i>eMinLeftJunction</i> times the energy of the final leg (in the | |
338 | junction rest frame). | |
339 | ||
340 | ||
341 | <input type="hidden" name="saved" value="1"/> | |
342 | ||
343 | <?php | |
344 | echo "<input type='hidden' name='filepath' value='".$_GET["filepath"]."'/>"?> | |
345 | ||
346 | <table width="100%"><tr><td align="right"><input type="submit" value="Save Settings" /></td></tr></table> | |
347 | </form> | |
348 | ||
349 | <?php | |
350 | ||
351 | if($_POST["saved"] == 1) | |
352 | { | |
353 | $filepath = $_POST["filepath"]; | |
354 | $handle = fopen($filepath, 'a'); | |
355 | ||
356 | if($_POST["1"] != "0.3") | |
357 | { | |
358 | $data = "StringZ:aLund = ".$_POST["1"]."\n"; | |
359 | fwrite($handle,$data); | |
360 | } | |
361 | if($_POST["2"] != "0.8") | |
362 | { | |
363 | $data = "StringZ:bLund = ".$_POST["2"]."\n"; | |
364 | fwrite($handle,$data); | |
365 | } | |
366 | if($_POST["3"] != "0.5") | |
367 | { | |
368 | $data = "StringZ:aExtraDiquark = ".$_POST["3"]."\n"; | |
369 | fwrite($handle,$data); | |
370 | } | |
371 | if($_POST["4"] != "1.0") | |
372 | { | |
373 | $data = "StringZ:rFactC = ".$_POST["4"]."\n"; | |
374 | fwrite($handle,$data); | |
375 | } | |
376 | if($_POST["5"] != "0.67") | |
377 | { | |
378 | $data = "StringZ:rFactB = ".$_POST["5"]."\n"; | |
379 | fwrite($handle,$data); | |
380 | } | |
381 | if($_POST["6"] != "1.0") | |
382 | { | |
383 | $data = "StringZ:rFactH = ".$_POST["6"]."\n"; | |
384 | fwrite($handle,$data); | |
385 | } | |
386 | if($_POST["7"] != "off") | |
387 | { | |
388 | $data = "StringZ:usePetersonC = ".$_POST["7"]."\n"; | |
389 | fwrite($handle,$data); | |
390 | } | |
391 | if($_POST["8"] != "off") | |
392 | { | |
393 | $data = "StringZ:usePetersonB = ".$_POST["8"]."\n"; | |
394 | fwrite($handle,$data); | |
395 | } | |
396 | if($_POST["9"] != "off") | |
397 | { | |
398 | $data = "StringZ:usePetersonH = ".$_POST["9"]."\n"; | |
399 | fwrite($handle,$data); | |
400 | } | |
401 | if($_POST["10"] != "0.05") | |
402 | { | |
403 | $data = "StringZ:epsilonC = ".$_POST["10"]."\n"; | |
404 | fwrite($handle,$data); | |
405 | } | |
406 | if($_POST["11"] != "0.005") | |
407 | { | |
408 | $data = "StringZ:epsilonB = ".$_POST["11"]."\n"; | |
409 | fwrite($handle,$data); | |
410 | } | |
411 | if($_POST["12"] != "0.005") | |
412 | { | |
413 | $data = "StringZ:epsilonH = ".$_POST["12"]."\n"; | |
414 | fwrite($handle,$data); | |
415 | } | |
416 | if($_POST["13"] != "0.304") | |
417 | { | |
418 | $data = "StringPT:sigma = ".$_POST["13"]."\n"; | |
419 | fwrite($handle,$data); | |
420 | } | |
421 | if($_POST["14"] != "0.01") | |
422 | { | |
423 | $data = "StringPT:enhancedFraction = ".$_POST["14"]."\n"; | |
424 | fwrite($handle,$data); | |
425 | } | |
426 | if($_POST["15"] != "2.0") | |
427 | { | |
428 | $data = "StringPT:enhancedWidth = ".$_POST["15"]."\n"; | |
429 | fwrite($handle,$data); | |
430 | } | |
431 | if($_POST["16"] != "1.0") | |
432 | { | |
433 | $data = "StringFragmentation:stopMass = ".$_POST["16"]."\n"; | |
434 | fwrite($handle,$data); | |
435 | } | |
436 | if($_POST["17"] != "2.0") | |
437 | { | |
438 | $data = "StringFragmentation:stopNewFlav = ".$_POST["17"]."\n"; | |
439 | fwrite($handle,$data); | |
440 | } | |
441 | if($_POST["18"] != "0.2") | |
442 | { | |
443 | $data = "StringFragmentation:stopSmear = ".$_POST["18"]."\n"; | |
444 | fwrite($handle,$data); | |
445 | } | |
446 | if($_POST["19"] != "1.") | |
447 | { | |
448 | $data = "HadronLevel:mStringMin = ".$_POST["19"]."\n"; | |
449 | fwrite($handle,$data); | |
450 | } | |
451 | if($_POST["20"] != "0.3") | |
452 | { | |
453 | $data = "FragmentationSystems:mJoin = ".$_POST["20"]."\n"; | |
454 | fwrite($handle,$data); | |
455 | } | |
456 | if($_POST["21"] != "1.0") | |
457 | { | |
458 | $data = "FragmentationSystems:mJoinJunction = ".$_POST["21"]."\n"; | |
459 | fwrite($handle,$data); | |
460 | } | |
461 | if($_POST["22"] != "2") | |
462 | { | |
463 | $data = "MiniStringFragmentation:nTry = ".$_POST["22"]."\n"; | |
464 | fwrite($handle,$data); | |
465 | } | |
466 | if($_POST["23"] != "2.0") | |
467 | { | |
468 | $data = "StringFragmentation:eNormJunction = ".$_POST["23"]."\n"; | |
469 | fwrite($handle,$data); | |
470 | } | |
471 | if($_POST["24"] != "1.0") | |
472 | { | |
473 | $data = "StringFragmentation:eBothLeftJunction = ".$_POST["24"]."\n"; | |
474 | fwrite($handle,$data); | |
475 | } | |
476 | if($_POST["25"] != "10.0") | |
477 | { | |
478 | $data = "StringFragmentation:eMaxLeftJunction = ".$_POST["25"]."\n"; | |
479 | fwrite($handle,$data); | |
480 | } | |
481 | if($_POST["26"] != "0.2") | |
482 | { | |
483 | $data = "StringFragmentation:eMinLeftJunction = ".$_POST["26"]."\n"; | |
484 | fwrite($handle,$data); | |
485 | } | |
486 | fclose($handle); | |
487 | } | |
488 | ||
489 | ?> | |
490 | </body> | |
491 | </html> | |
492 | ||
493 | <!-- Copyright (C) 2012 Torbjorn Sjostrand --> | |
494 |