I wrote a paper which got accepted in a reputed journal, I wrote another paper with completely different work, however when I submitted the second paper I mistakenly (actually I was in a hurry) with the old title (of accepted paper). What should I do now, should I withdraw my paper, or let the editor know about this, the paper is still in phase of "waiting for editor assignment" thankyou
Although the question doesn't explicitly say so, I guess that the incorrect title is only in the web form for the submission, not on the paper itself. If that's correct, then I think you could just write to the editor: "Dear [editor's name], When I submitted my paper [correct title] for publication in [journal name], I mistakenly put an incorrect title [wrong title] on the web form. Could you please either correct that in the system or tell me how to correct it? Thank you, [your name]"
If, on the other hand, the paper itself had the wrong title (which I find hard to imagine), then your email to the editor should, in addition to explaining what happened, include an attachment with the correct version of the paper.