[Blackmax] FW: Running BlackMax at 8 TeV failed

[Marc Cano Bret]

Hi Shaoqi,

I have been doing some testing. In the computer I am using I could not
compile both Pythia 6.4.28 and LHAPDF 6.1.5 (the versions you are using),
so I am using Pythia 6.4.28 and LHAPDF 5.3.0, the version quoted in the
README with which BlackMax was tested. Now, using the same parameter.txt,
but changing the PDF value to 10000 (MSTW2008 is not available in the
LHAPDF version I use) file you sent Prof. Issever I can generate all the
events without any errors. Hence, I can suggest a few things:

   1. If you want to carry on using the same LHAPDF with the MSTW2008
   pdfset, you could try generating events in batches of 1000, avoiding the
   crash. I haven't reproduced the problem just yet, but the crashing problem
   seems to come from Pythia rather than BlackMax and at the moment I don't
   know a way around it.
   2. I have also tried generating events without Pythia's instant
   hadronization, and that works fine too. Hence, instead of compiling by
   doing "gmake all" you can use "gmake BlackMax". With this option, the code
   will anyway generated a .lhe file which you can feed to Pythia.
   3. You can move to the same LHAPDF version I have used, changing your
   PDF in the process, which seems to work fine.

Sorry I can't solve the issue at the moment, but I am having my thesis
defence soon, after that perhaps we can talk more at length. Hope that
helps for the moment.

Best,

Marc

On 3 March 2015 at 18:28, Marc Cano Bret <marc.bret.87 at gmail.com> wrote:

> Hi Shaoqi,
>
> Good question. At the moment I don't know as its something I haven't
> attempted yet but I will try to come back to you as soon as possible.
>
> Best,
>
> Marc
>
> On 3 March 2015 at 18:25, Shaoqi Hou <shou at crimson.ua.edu> wrote:
>
>> Hi Marc,
>>
>> How to discard the event? Thank you very much!
>>
>> Best Wishes
>>
>> Shaoqi
>>
>>
>> On Tue, Mar 3, 2015 at 12:04 PM, Marc Cano Bret <marc.bret.87 at gmail.com>
>> wrote:
>>
>>> Hi Shaoqi,
>>>
>>> Discussing with my supervisor, It could well be that its a common
>>> problem as sometimes Pythia can refuse to hadronize an event. Ideally we
>>> should just discard that event rather than making the whole code stop when
>>> it happens.
>>>
>>> Thanks,
>>>
>>> Marc
>>>
>>> On 3 March 2015 at 17:52, Shaoqi Hou <shou at crimson.ua.edu> wrote:
>>>
>>>> Hi Mr. Marc Cano Bret,
>>>>
>>>> Thanks for your help! I compiled BlackMax in the all mode. And I use
>>>> older version of PYTHIA. pythia-6.4.28.
>>>>
>>>> Best Wishes
>>>>
>>>> Shaoqi
>>>>
>>>>
>>>> On Tue, Mar 3, 2015 at 8:55 AM, Marc Cano Bret <marc.bret.87 at gmail.com>
>>>> wrote:
>>>>
>>>>> Dear Shaoqi,
>>>>>
>>>>> I have been forwarded the email discussion you had with Prof. Issever
>>>>> on the BlackMax issue you have encountered. Could you please tell me which
>>>>> option are you using to compile BlackMax (BlackMaxOnly, BlackMax or all)
>>>>> and the Pythia version you are using? Using the same parameter.txt file you
>>>>> sent Prof. Issever I can generate events just fine by compiling in the
>>>>> BlackMax mode, so I guess the problem might be with Pythia if you are using
>>>>> the all compilation mode.
>>>>>
>>>>> Best,
>>>>>
>>>>> Marc
>>>>>
>>>>> On 3 March 2015 at 14:50, Marc Cano Bret <marc.bret.87 at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Hi Cigdem,
>>>>>>
>>>>>> Looking through the output file and the parameter.txt I don't see
>>>>>> anything striking. I have run BlackMax myself using his file and don't get
>>>>>> any errors. I first ran with the CTEQ PDF and then with the PDF he is using
>>>>>> (21000, which is MSTW2008). It is then quite possible that this is a Pythia
>>>>>> issue. I normally compile BlackMax with the BlackMaxOnly or BlackMax choice
>>>>>> so I haven't encountered this problem. The Pythia version I have in my
>>>>>> computer (8.175) is very recent and BlackMax doesnt compile with that one.
>>>>>> We should ask which option he is using to compile BlackMax and if he is
>>>>>> using the Pythia version mentioned in the README file. I will drop him an
>>>>>> email.
>>>>>>
>>>>>> Best,
>>>>>>
>>>>>> Marc
>>>>>>
>>>>>> On 3 March 2015 at 14:18, Cigdem Issever <c.Issever1 at physics.ox.ac.uk
>>>>>> > wrote:
>>>>>>
>>>>>>>  and the outputs
>>>>>>>
>>>>>>>
>>>>>>> ---------------------------------------------------------------------
>>>>>>> Cigdem Issever
>>>>>>> <https://www2.physics.ox.ac.uk/contacts/people/issever>
>>>>>>>
>>>>>>> University of Oxford                    @ CERN office 104/1-C14
>>>>>>> Skype-id: cigdem.issever            Oxford Tel: +44-1865-273337
>>>>>>>
>>>>>>> ---------------------------------------------------------------------
>>>>>>>      ------------------------------
>>>>>>> *From:* Shaoqi Hou [shou at crimson.ua.edu]
>>>>>>> *Sent:* 25 February 2015 15:57
>>>>>>> *To:* Cigdem Issever
>>>>>>> *Cc:* Email the developers
>>>>>>> *Subject:* Re: [Blackmax] Running BlackMax at 8 TeV failed
>>>>>>>
>>>>>>>    Hi Prof. Issever,
>>>>>>>
>>>>>>> I ran BlackMax with the newest parameter.txt sent to you. BlackMax
>>>>>>> stalled after about 2 min, 1481 events simulated. No more events were
>>>>>>> simulated further. Please download the two attachments. Thank you very much!
>>>>>>>
>>>>>>> Best Wishes
>>>>>>>
>>>>>>> Shaoqi
>>>>>>>
>>>>>>> ​
>>>>>>>   BlackMaxLHArecord.lhe
>>>>>>> <https://docs.google.com/a/crimson.ua.edu/file/d/0B4MDh9xjGUXvanQ3bEVEQWFXLUU/edit?usp=drive_web>
>>>>>>> ​​
>>>>>>>   output.txt
>>>>>>> <https://docs.google.com/a/crimson.ua.edu/file/d/0B4MDh9xjGUXvbHpVNFhQWGxVN0E/edit?usp=drive_web>
>>>>>>> ​
>>>>>>>
>>>>>>>
>>>>>>> On Wed, Feb 25, 2015 at 8:40 AM, Cigdem Issever <
>>>>>>> c.Issever1 at physics.ox.ac.uk> wrote:
>>>>>>>
>>>>>>>>  Can you also send me any output BlackMax produce when you run it
>>>>>>>> with the 8TeV setup?
>>>>>>>>
>>>>>>>> I will try to run BlackMax myself with your settings and see if I
>>>>>>>> can reproduce it.
>>>>>>>>
>>>>>>>> Cigdem
>>>>>>>>
>>>>>>>>
>>>>>>>> ---------------------------------------------------------------------
>>>>>>>> Cigdem Issever
>>>>>>>> <https://www2.physics.ox.ac.uk/contacts/people/issever>
>>>>>>>>
>>>>>>>> University of Oxford                    @ CERN office 104/1-C14
>>>>>>>> Skype-id: cigdem.issever            Oxford Tel: +44-1865-273337
>>>>>>>>
>>>>>>>>
>>>>>>>> ---------------------------------------------------------------------
>>>>>>>>      ------------------------------
>>>>>>>> *From:* Cigdem Issever
>>>>>>>> *Sent:* 24 February 2015 17:03
>>>>>>>>
>>>>>>>> *To:* shou at crimson.ua.edu; Email the developers
>>>>>>>> *Subject:* RE: [Blackmax] Running BlackMax at 8 TeV failed
>>>>>>>>
>>>>>>>>    I am not sure what BlackMax does if you set the maximum mass to
>>>>>>>> a higher value than the centre of mass energy.
>>>>>>>>
>>>>>>>> Can you try to run blackmax for the COM = 8 TeV with a maximum mass
>>>>>>>> value of 8TeV? and see if you still have this problem?
>>>>>>>>
>>>>>>>> Cigdem
>>>>>>>>
>>>>>>>>
>>>>>>>> ---------------------------------------------------------------------
>>>>>>>> Cigdem Issever
>>>>>>>> <https://www2.physics.ox.ac.uk/contacts/people/issever>
>>>>>>>>
>>>>>>>> University of Oxford                    @ CERN office 104/1-C14
>>>>>>>> Skype-id: cigdem.issever            Oxford Tel: +44-1865-273337
>>>>>>>>
>>>>>>>>
>>>>>>>> ---------------------------------------------------------------------
>>>>>>>>      ------------------------------
>>>>>>>> *From:* Cigdem Issever
>>>>>>>> *Sent:* 24 February 2015 17:01
>>>>>>>> *To:* shou at crimson.ua.edu; Email the developers
>>>>>>>> *Subject:* RE: [Blackmax] Running BlackMax at 8 TeV failed
>>>>>>>>
>>>>>>>>   Dear Shaoqi,
>>>>>>>>
>>>>>>>> the parameter file you have send is this the the file which causes
>>>>>>>> the problems? I see that the centre of mass energy in this file is set to
>>>>>>>> 9TeV. Can you send me the file which causes the problem? Or are you just
>>>>>>>> changing the centre of mass energy from 9 to 8 TeV in this file and you end
>>>>>>>> up with problems?
>>>>>>>>
>>>>>>>> I just want to make sure that there is not a typo in the parameter
>>>>>>>> file where you set the CoM to 8 TeV.
>>>>>>>>
>>>>>>>> Best
>>>>>>>>   Cigdem
>>>>>>>>
>>>>>>>>
>>>>>>>> ---------------------------------------------------------------------
>>>>>>>> Cigdem Issever
>>>>>>>> <https://www2.physics.ox.ac.uk/contacts/people/issever>
>>>>>>>>
>>>>>>>> University of Oxford                    @ CERN office 104/1-C14
>>>>>>>> Skype-id: cigdem.issever            Oxford Tel: +44-1865-273337
>>>>>>>>
>>>>>>>>
>>>>>>>> ---------------------------------------------------------------------
>>>>>>>>      ------------------------------
>>>>>>>> *From:* blackmax-bounces at projects.hepforge.org [
>>>>>>>> blackmax-bounces at projects.hepforge.org] on behalf of Shaoqi Hou [
>>>>>>>> shou at crimson.ua.edu]
>>>>>>>> *Sent:* 24 February 2015 16:45
>>>>>>>> *To:* blackmax at projects.hepforge.org
>>>>>>>> *Subject:* [Blackmax] Running BlackMax at 8 TeV failed
>>>>>>>>
>>>>>>>>    To whom it may concern,
>>>>>>>>
>>>>>>>>  I am a graduate student at the University of Alabama. Recently, I
>>>>>>>> tried to run BlackMax to reproduce the results of Fig. 1 published in the
>>>>>>>> paper JHEP 07 (2013) 178. But unfortunately, BlackMax got stuck when the
>>>>>>>> center of mass energy was set to 8 TeV. If the center of mass energy is 14
>>>>>>>> TeV or 9 TeV, BlackMax runs successfully. The attachment is the parameter
>>>>>>>> file. Please look into this problem. Thank you!
>>>>>>>>
>>>>>>>>  Best wishes
>>>>>>>>
>>>>>>>>  Shaoqi Hou
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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